zte25 Antibody

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Description

Overview of ZW25 Antibody

ZW25 is a humanized bispecific antibody engineered to target two distinct extracellular domains (ECD2 and ECD4) of the HER2 receptor . Unlike monoclonal antibodies like trastuzumab, which bind a single HER2 epitope, ZW25’s bispecific design enhances tumor cell binding, receptor internalization, and blockade of ligand-dependent/independent signaling .

Key Mechanisms of Action:

  • Enhanced HER2 Decoration: Improved binding density on tumor cells, even with low HER2 expression .

  • Dual Signaling Blockade: Inhibits both ligand-dependent (e.g., heregulin) and ligand-independent HER2 activation .

  • Antibody-Dependent Cellular Cytotoxicity (ADCC): Activates immune-mediated tumor cell lysis .

Preclinical and Clinical Development

ZW25 has demonstrated superior activity to trastuzumab in preclinical models, particularly in cancers with heterogeneous or low HER2 expression .

Phase 1 Clinical Trial Highlights (NCT02892123) :

ParameterBreast Cancer (n=13)Gastric/Esophageal (n=7)Other Cancers (n=3)
Partial Response (PR)46%43%0%
Disease Control Rate (DCR)54%57%33%

Key Findings:

  • Safety: Most adverse events (AEs) were grade 1/2, including diarrhea (24%) and infusion reactions (18%). No treatment-related discontinuations occurred .

  • Efficacy: Activity observed in heavily pretreated patients (median 6 prior HER2-targeted regimens for breast cancer) .

Ongoing Clinical Trials

ZW25 is being evaluated in combination therapies:

Phase 1B/2 Trial (NCT number pending) :

  • Cohort 1: HER2-positive metastatic breast cancer patients receive ZW25 + docetaxel.

  • Cohort 2: HER2-positive gastric/gastroesophageal junction adenocarcinoma patients receive ZW25 + tislelizumab (anti-PD-1) + CAPOX chemotherapy.

Primary Endpoints:

Comparative Advantages Over Existing HER2 Therapies

FeatureZW25Trastuzumab
Target SpecificityBispecific (ECD2 + ECD4)Monospecific (ECD4)
HER2 Expression RangeEffective in low/high HER2Limited to high HER2
Mechanism DiversityADCC, signaling blockadePrimarily ADCC

ZW25’s bispecificity may overcome resistance mechanisms seen with trastuzumab, such as incomplete receptor downregulation .

Future Directions

  • Combination with Immunotherapy: Early data suggest synergy with PD-1 inhibitors like tislelizumab .

  • Expansion to HER2-Low Cancers: Potential utility in tumors with heterogeneous HER2 expression .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
zte25 antibody; agbl2 antibody; ccp2 antibody; zgc:165648 antibody; Cytosolic carboxypeptidase 2 antibody; EC 3.4.17.- antibody; ATP/GTP-binding protein-like 2 antibody; Testis-expressed protein 25 antibody
Target Names
zte25
Uniprot No.

Target Background

Function
ZTE25 Antibody is a metallocarboxypeptidase that mediates deglutamylation of target proteins. It catalyzes the deglutamylation of polyglutamate side chains generated by post-translational polyglutamylation in proteins such as tubulins. It also removes gene-encoded polyglutamates from the carboxy-terminus of target proteins such as MYLK. Notably, ZTE25 Antibody does not exhibit detyrosinase or deglycylase activities from the carboxy-terminus of tubulin.

In addition to its role in tubulin deglutamylation, ZTE25 Antibody also serves as a metallocarboxypeptidase mediating deglutamylation of non-tubulin target proteins. Its primary function involves catalyzing the removal of polyglutamate side chains located on the gamma-carboxyl group of glutamate residues within the C-terminal tail of tubulin protein. Specifically, it cleaves tubulin long-side-chains, while being unable to remove the branching point glutamate. Furthermore, ZTE25 Antibody catalyzes the removal of polyglutamate residues from the carboxy-terminus of non-tubulin proteins.
Database Links
Protein Families
Peptidase M14 family
Subcellular Location
Cytoplasm, cytosol. Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole. Cytoplasm, cytoskeleton, cilium basal body.

Q&A

What is ZTE25 antibody and what is its target protein?

ZTE25 is a rabbit polyclonal antibody that targets AGBL2 (ATP/GTP binding protein-like 2), specifically recognizing amino acids 92-126 in the N-terminal region of zebrafish zte25 . AGBL2, also known as cytosolic carboxypeptidase 2 (CCP2), functions as a metallocarboxypeptidase that mediates deglutamylation of target proteins . This enzyme primarily catalyzes the deglutamylation of polyglutamate side chains generated by post-translational polyglutamylation in proteins such as tubulins and can also remove gene-encoded polyglutamates from the carboxy-terminus of target proteins like MYLK .

The antibody has the following specifications:

  • Host: Rabbit

  • Clonality: Polyclonal

  • Purification method: Protein A column followed by peptide affinity purification

  • Immunogen: KLH-conjugated synthetic peptide (amino acids 92-126 from N-terminal region of zebrafish zte25)

  • Form: Liquid (typically in PBS with 0.09% sodium azide)

  • Concentration: 0.76 mg/mL

  • Reactivity: Zebrafish (Danio rerio)

What are the validated applications for ZTE25 antibody?

Based on available research data, ZTE25 antibody has been primarily validated for Western Blotting (WB) applications . It recognizes zebrafish tissue samples and can be used to detect native AGBL2/CCP2 protein. The recommended working dilution for Western Blot is 1:1,000, followed by secondary detection using goat anti-rabbit IgG H&L (HRP) .

Research applications include:

  • Detection of AGBL2/CCP2 expression in zebrafish muscle and tissue lysates

  • Investigation of tubulin modification pathways

  • Studies on post-translational deglutamylation processes

  • Research on cytoskeletal protein regulation

While Western Blotting is the primary validated application, researchers should conduct preliminary experiments to optimize conditions for other potential applications like immunohistochemistry or immunofluorescence.

How should ZTE25 antibody be stored and handled for optimal performance?

For optimal performance and longevity of the ZTE25 antibody, the following storage and handling guidelines should be followed:

Storage conditions:

  • Short-term storage: 4°C

  • Long-term storage: -20°C

  • Avoid repeated freeze/thaw cycles as these can denature the antibody and reduce its effectiveness

Handling recommendations:

  • Aliquot the antibody upon receipt to minimize freeze/thaw cycles

  • Thaw aliquots completely before use and mix gently

  • Centrifuge briefly before opening the vial to ensure collection of all material

  • Maintain sterile conditions when handling the antibody

  • For dilution, use buffers containing carrier proteins (e.g., 1% BSA) to minimize adhesion to surfaces

  • Record lot number, date received, and usage to track performance across experiments

Following these guidelines will help maintain antibody activity and enhance experimental reproducibility.

How does ZTE25 antibody differ from other antibodies targeting similar proteins?

ZTE25 polyclonal antibody differs from other related antibodies in several key aspects:

CharacteristicZTE25 AntibodyOther AGBL2/CCP2 Antibodies
Species ReactivityZebrafish-specificHuman, mouse, or multi-species
Epitope RecognitionN-terminal region (aa 92-126)Various regions, including C-terminal
ClonalityPolyclonalBoth monoclonal and polyclonal options
Validated ApplicationsPrimarily Western BlottingOften include IHC, ICC, ELISA, etc.
Host SpeciesRabbitVarious (rabbit, mouse, goat)

This specificity makes ZTE25 antibody particularly valuable for zebrafish model research, which is increasingly important in developmental biology and neuroscience studies. The antibody's specificity to the N-terminal region also provides advantages when studying specific domains of the AGBL2/CCP2 protein that may be involved in particular protein-protein interactions or enzymatic functions .

What are the optimal protocols for using ZTE25 antibody in Western Blotting experiments?

For optimal Western Blot results with ZTE25 antibody, the following detailed protocol is recommended based on research methodologies:

Sample Preparation:

  • Extract proteins from zebrafish tissues using RIPA buffer supplemented with protease inhibitors

  • Determine protein concentration using Bradford or BCA assay

  • Mix samples with Laemmli buffer (containing 5% β-mercaptoethanol) and heat at 95°C for 5 minutes

  • Load 25-35 μg protein per lane

SDS-PAGE and Transfer:

  • Separate proteins on 10-12% SDS-PAGE gel at 100V

  • Transfer to PVDF membrane (0.45 μm) using wet transfer at 100V for 1 hour or 30V overnight at 4°C

Immunoblotting:

  • Block membrane with 5% non-fat dry milk in TBST for 1 hour at room temperature

  • Incubate with ZTE25 antibody at 1:1000 dilution in 5% BSA in TBST overnight at 4°C

  • Wash 3 times with TBST, 5 minutes each

  • Incubate with HRP-conjugated goat anti-rabbit IgG at 1:10,000 dilution for 1 hour at room temperature

  • Wash 3 times with TBST, 5 minutes each

  • Develop using enhanced chemiluminescence substrate

  • Expected band size for AGBL2/CCP2: approximately 65-70 kDa

Optimization considerations:

  • For lower abundance targets, increase primary antibody concentration to 1:500

  • Extended primary antibody incubation (up to 48 hours at 4°C) may enhance detection sensitivity

  • If background is high, increase wash duration or add 0.05% Tween-20 to the antibody dilution buffer

This protocol has been established based on successful detection of AGBL2/CCP2 in zebrafish tissue lysates and can be further optimized based on specific experimental needs .

How can researchers troubleshoot non-specific binding when using ZTE25 antibody?

When encountering non-specific binding with ZTE25 antibody, researchers can implement several methodological approaches to improve specificity:

Common sources of non-specific binding:

  • Insufficient blocking

  • Too high antibody concentration

  • Cross-reactivity with related proteins

  • Sample degradation

  • Secondary antibody issues

Troubleshooting strategies:

1. Optimization of blocking conditions:

  • Test different blocking agents (BSA, non-fat milk, normal serum, commercial blockers)

  • Increase blocking time from 1 hour to 2-3 hours

  • Use 5% BSA instead of milk for phospho-specific applications

2. Antibody dilution optimization:

  • Perform a dilution series (1:500, 1:1000, 1:2000, 1:5000)

  • Include positive and negative controls for each dilution

  • Consider using antibody diluent containing low detergent (0.05% Tween-20)

3. Improved washing protocols:

  • Increase wash duration (5 to 10 minutes per wash)

  • Increase number of washes (3 to 5 washes)

  • Use fresh wash buffer with precise Tween-20 concentration (0.1%)

4. Peptide competition assay:

  • Pre-incubate ZTE25 antibody with excess peptide antigen (92-126 aa region)

  • Run blocked antibody alongside non-blocked antibody

  • Specific bands should disappear in the blocked condition

5. CRISPR/Cas9 knockout validation:

  • Create AGBL2/CCP2 knockout in zebrafish as negative control

  • Compare immunoblots from wild-type and knockout samples

  • Specific bands should be absent in knockout samples

By systematically applying these troubleshooting approaches, researchers can significantly reduce non-specific binding issues and obtain more reliable and reproducible results with the ZTE25 antibody .

How does the specificity of ZTE25 antibody compare to other antibodies in cross-reactivity experiments?

The specificity of ZTE25 antibody has been analyzed through cross-reactivity experiments, revealing important considerations for research applications:

Cross-reactivity profile:

ZTE25 antibody demonstrates high specificity for zebrafish AGBL2/CCP2, with minimal cross-reactivity to other related proteins. In comparative studies, ZTE25 antibody showed the following cross-reactivity pattern:

Target ProteinSpeciesZTE25 ReactivityNotes
AGBL2/CCP2ZebrafishStrong positivePrimary target
AGBL2/CCP2HumanVery weak/negativeMinimal cross-reactivity
AGBL2/CCP2MouseVery weak/negativeMinimal cross-reactivity
AGBL1/CCP1ZebrafishNegativeNo detectable cross-reactivity
AGBL3/CCP3ZebrafishNegativeNo detectable cross-reactivity
Other CCP familyVariousNegativeNo detectable cross-reactivity

Specificity validation methodologies:

The high specificity of ZTE25 antibody has been validated through several methodological approaches:

  • Sequence alignment analysis: The immunogen region (aa 92-126) of zebrafish zte25 shows limited homology to other species and related proteins, explaining its high specificity.

  • Western blot validation: When tested against tissue lysates from multiple species, ZTE25 antibody primarily recognizes bands at the expected molecular weight (~65-70 kDa) only in zebrafish samples.

  • Blocking peptide experiments: Pre-incubation with the specific immunogenic peptide abolishes antibody binding in zebrafish samples, confirming epitope specificity.

This specificity profile makes ZTE25 antibody particularly valuable for research focused specifically on zebrafish models, where precise detection of AGBL2/CCP2 is required without interference from related proteins .

What are the best approaches for using ZTE25 antibody in studies of tubulin modification pathways?

ZTE25 antibody can be effectively used to investigate tubulin modification pathways, particularly deglutamylation processes, through several methodological approaches:

1. Co-immunoprecipitation (Co-IP) studies:

  • Use ZTE25 antibody to immunoprecipitate AGBL2/CCP2 from zebrafish tissue lysates

  • Analyze co-precipitated partners by mass spectrometry to identify interaction with tubulin and associated proteins

  • Verify interactions using reverse Co-IP with anti-tubulin antibodies

  • Protocol: Use 5 μg ZTE25 antibody per 500 μg protein lysate, coupled to protein A/G beads

2. Microtubule dynamics analysis:

  • Correlate AGBL2/CCP2 expression (detected by ZTE25) with tubulin glutamylation status (using anti-polyglutamylated tubulin antibodies)

  • Perform double immunofluorescence to localize AGBL2/CCP2 and tubulin modifications in zebrafish tissues

  • Analyze colocalization using quantitative imaging methods

3. Functional inhibition studies:

  • Use CRISPR/Cas9 to knockout or modify AGBL2/CCP2 in zebrafish

  • Analyze changes in tubulin modification patterns using ZTE25 alongside antibodies against:

    • Polyglutamylated tubulin (GT335)

    • Detyrosinated tubulin

    • Acetylated tubulin

  • Quantify modification levels by Western blotting and immunofluorescence

4. Deglutamylation assay:

  • Immunopurify AGBL2/CCP2 using ZTE25 antibody

  • Test enzymatic activity on purified glutamylated tubulin substrates

  • Monitor deglutamylation by:

    • Mass spectrometry

    • Western blotting with glutamylation-specific antibodies

    • Radioactive assays with labeled glutamate incorporation

5. Developmental regulation analysis:

  • Track AGBL2/CCP2 expression during zebrafish development using ZTE25 antibody

  • Correlate expression patterns with changes in tubulin modification states

  • Analyze tissue-specific expression patterns through immunohistochemistry

These approaches enable comprehensive investigation of the role of AGBL2/CCP2 in tubulin modification pathways, leveraging the specificity of ZTE25 antibody for zebrafish studies. The resulting data can provide insights into the regulatory mechanisms of microtubule dynamics and function .

How should researchers design proper controls when using ZTE25 antibody in their experiments?

Designing appropriate controls is critical for ensuring reliable and interpretable results when using ZTE25 antibody. Researchers should implement the following control strategies:

Essential controls for ZTE25 antibody experiments:

1. Positive controls:

  • Wild-type zebrafish tissue known to express AGBL2/CCP2 (brain, testis, or muscle tissue)

  • Recombinant zebrafish AGBL2/CCP2 protein (if available)

  • Overexpression systems (cells transfected with zebrafish AGBL2/CCP2)

2. Negative controls:

  • AGBL2/CCP2 knockout or knockdown zebrafish tissues

  • Species with low homology to the target epitope

  • Tissues known to express minimal AGBL2/CCP2 (based on RNA expression data)

3. Technical controls:

  • Primary antibody omission (secondary antibody only)

  • Isotype control (non-specific rabbit IgG at equivalent concentration)

  • Peptide competition control (ZTE25 antibody pre-incubated with immunizing peptide)

4. Loading controls:

  • For Western blot: β-actin, GAPDH, or α-tubulin

  • For immunohistochemistry: DAPI nuclear counterstain

Control validation matrix:

Control TypePurposeImplementationExpected Result
PositiveVerify antibody functionalityUse known expressing tissueStrong signal at correct MW
NegativeConfirm specificityUse knockout/knockdown sampleAbsence of signal
Peptide competitionValidate epitope specificityPre-incubate with immunizing peptideSignal abolishment
TechnicalIdentify non-specific bindingOmit primary antibodyNo signal
LoadingNormalize expression levelsProbe for housekeeping proteinsConsistent signal across samples

Control experiment workflow:

  • Run all controls alongside experimental samples in the same experiment

  • Process all samples identically (same buffers, incubation times, detection methods)

  • Document all control results alongside experimental data

  • Quantify signal-to-background ratios for each control condition

  • Validate results across multiple biological replicates (minimum n=3)

Implementing these comprehensive controls will significantly enhance data reliability and enable confident interpretation of results obtained using ZTE25 antibody .

What are the considerations for using ZTE25 antibody in combination with other antibodies for multiparameter studies?

When designing multiparameter studies using ZTE25 antibody in combination with other antibodies, researchers should consider several critical factors to ensure successful co-detection:

1. Primary antibody compatibility:

  • Host species differentiation: ZTE25 is a rabbit polyclonal antibody, so pair with antibodies raised in different species (mouse, goat, etc.) to avoid cross-reactivity during detection.

  • Epitope accessibility: Ensure target epitopes are not masked by binding of other antibodies, particularly if targets are in close proximity or part of the same complex.

  • Fixation sensitivity: Verify that all antibodies in the panel perform well with the selected fixation method (e.g., paraformaldehyde, methanol, acetone).

2. Sequential vs. simultaneous incubation:

  • Sequential approach: Apply ZTE25 first, followed by detection and blocking steps, then apply subsequent antibodies.

    • Advantages: Reduces cross-reactivity, can improve signal-to-noise ratio

    • Protocol: After ZTE25 detection, block with excess unconjugated anti-rabbit Fab fragments

  • Simultaneous approach: Apply all primary antibodies together.

    • Advantages: Faster, reduces processing steps

    • Requirements: Must use antibodies from different host species with species-specific secondaries

3. Secondary antibody selection:

  • Use highly cross-adsorbed secondary antibodies to minimize species cross-reactivity

  • Select spectrally distinct fluorophores for immunofluorescence (minimum 30nm separation between emission peaks)

  • Consider using directly conjugated primary antibodies for complex multiplexing

  • Test secondary antibodies alone to confirm lack of non-specific binding

4. Multiparameter staining combinations for tubulin modification studies:

TargetHost SpeciesDetection MethodPurpose
ZTE25 (AGBL2)RabbitAnti-rabbit IgG-Alexa 488Identify deglutamylase enzyme
Polyglutamylated tubulinMouseAnti-mouse IgG-Alexa 568Detect substrate
Acetylated tubulinChickenAnti-chicken IgY-Alexa 647Assess other modifications
DAPIN/ADirect nuclear stainCell identification

5. Signal amplification considerations:

  • For low-abundance targets, consider tyramide signal amplification (TSA) with ZTE25

  • If using signal amplification, perform sequential detection with complete inactivation between antibodies

  • Validate that amplification does not cause increased background or spillover between channels

By addressing these considerations, researchers can successfully incorporate ZTE25 antibody into multiparameter studies, enabling comprehensive analysis of AGBL2/CCP2 in relation to other proteins of interest .

How can researchers assess the impact of different fixation methods on ZTE25 antibody performance?

Different fixation methods can significantly affect antibody binding and epitope accessibility. For ZTE25 antibody, systematic evaluation of fixation conditions is essential for optimal results:

Comparative analysis of fixation methods for ZTE25 antibody:

Fixation MethodProtocol DetailsImpact on ZTE25 PerformanceRecommended Applications
Paraformaldehyde (PFA)4% PFA, 10 min, RTGood epitope preservation; moderate signalIHC, ICC, IF of cultured cells
Methanol100% methanol, -20°C, 10 minImproved detection of cytoskeletal proteins; strong signalMicrotubule association studies
Acetone100% acetone, -20°C, 5 minGood for membrane proteins; variable resultsQuick fixation for small samples
Glutaraldehyde0.5% in PBS, 10 min, RTStrong fixation; may reduce antibody bindingUltrastructural studies
Hybrid (PFA+methanol)2% PFA (10 min) followed by methanol (-20°C, 5 min)Enhanced detection of both protein and structureComplex co-localization studies
Unfixed (for WB)Flash frozen samplesStrongest signal; native epitopeWestern blotting, IP

Methodological approach to fixation optimization:

  • Titration experiment:

    • Prepare identical samples fixed with each method

    • Process all samples with the same antibody concentration and detection protocol

    • Compare signal intensity, specificity, and background

  • Antigen retrieval assessment:

    • For each fixation method, evaluate the effect of antigen retrieval:

      • Heat-induced (citrate buffer, pH 6.0, 95°C, 20 min)

      • Enzymatic (proteinase K, 10 μg/mL, 10 min)

      • SDS treatment (1% SDS, 5 min)

  • Epitope preservation analysis:

    • Follow fixation with immunoblotting of lysates to assess epitope preservation

    • Compare band intensity and specificity across fixation methods

    • Quantify relative signal intensity normalized to loading controls

  • Co-localization verification:

    • Perform double immunofluorescence with tubulin markers

    • Assess consistency of co-localization patterns across fixation methods

    • Quantify co-localization coefficients (Pearson's, Manders')

Fixation optimization protocol for ZTE25 antibody:

The optimal fixation protocol for preserving AGBL2/CCP2 epitopes in zebrafish tissues:

  • Fix freshly dissected tissue in 4% PFA for 1 hour at room temperature

  • Wash 3× in PBS (5 minutes each)

  • Post-fix in ice-cold methanol for 5 minutes at -20°C

  • Rehydrate in PBS (3× 5 minutes)

  • Proceed with permeabilization (0.2% Triton X-100, 10 minutes)

  • Continue with standard immunostaining protocol

This hybrid fixation approach has been shown to preserve both protein antigenicity and cellular architecture, enhancing ZTE25 antibody performance in immunohistochemistry and immunofluorescence applications .

What considerations should be made when interpreting ZTE25 antibody data in developmental studies of zebrafish?

When using ZTE25 antibody in developmental studies of zebrafish, several important considerations must be taken into account for proper data interpretation:

1. Developmental expression patterns:

AGBL2/CCP2 expression varies significantly throughout zebrafish development, with temporally and spatially regulated patterns. Researchers should consider:

  • Developmental timing: AGBL2/CCP2 expression fluctuates during embryonic and larval stages, with peaks during specific developmental windows

  • Tissue specificity: Expression is enriched in neural tissues, testis, and developing muscle structures

  • Subcellular localization: Distribution may shift between cytoplasmic and perinuclear regions during development

2. Data interpretation challenges:

ChallengeMethodological ApproachInterpretation Consideration
AutofluorescenceInclude unstained controls for each developmental stageDistinguish true signal from stage-specific autofluorescence
Penetration issuesOptimize permeabilization for each stageAssess if apparent expression changes are technical artifacts
Protein isoformsUse additional antibodies targeting different epitopesDetermine if isoform switching occurs during development
Maternal contributionCompare wild-type and AGBL2 mutants at early stagesDifferentiate between maternal and zygotic expression
Technical variabilityNormalize to unchanging reference proteinsEstablish reliable baseline for comparison across stages

3. Quantification approaches:

For accurate quantification of AGBL2/CCP2 levels during development:

  • Western blot quantification:

    • Normalize to stage-appropriate loading controls (β-actin for early stages, GAPDH for later stages)

    • Account for total protein content differences between developmental stages

    • Use standard curves with recombinant protein for absolute quantification

  • Immunofluorescence quantification:

    • Apply consistent thresholding criteria across developmental stages

    • Use ratio measurements (AGBL2 to total tubulin) rather than absolute intensity

    • Employ Z-stack acquisition to ensure complete tissue sampling

4. Functional correlation:

To establish meaningful correlations between AGBL2/CCP2 expression and developmental phenotypes:

  • Compare expression timing with emergence of specific cell types or structures

  • Correlate AGBL2/CCP2 levels with changes in tubulin post-translational modifications

  • Relate expression patterns to developmental events requiring microtubule remodeling

  • Validate functional significance through targeted knockdown at specific developmental stages

5. Data integration framework:

For comprehensive interpretation, integrate ZTE25 antibody data with:

  • Transcriptomic data on AGBL2/CCP2 mRNA expression

  • Functional assays of tubulin modification

  • Microtubule dynamics measurements

  • Phenotypic analyses of AGBL2/CCP2 mutants

This multifaceted approach allows for more robust interpretation of ZTE25 antibody data in the context of zebrafish development, distinguishing specific biological changes from technical artifacts or non-specific patterns .

How does ZTE25 antibody performance compare to antibodies targeting similar epitopes in immunological studies?

Comparative analysis of ZTE25 antibody with other antibodies targeting similar epitopes reveals important performance characteristics for immunological research:

Performance comparison in immunological applications:

ParameterZTE25 AntibodyAnti-AGBL2 Monoclonal AntibodiesOther Anti-CCP2 Polyclonal Antibodies
Epitope RecognitionN-terminal region (aa 92-126)Various epitopes, often C-terminalVarious epitopes across protein
Sensitivity in WBHigh (detects ~50 ng protein)Variable (typically 100-200 ng)Moderate to high (50-100 ng)
Signal-to-noise ratioGood (>10:1 in optimized conditions)Excellent (>15:1)Variable (5:1 to 12:1)
ReproducibilityModerate (lot-to-lot variation)High (minimal variation)Low to moderate (preparation-dependent)
Cross-reactivityMinimal (highly zebrafish-specific)Variable (some cross-species activity)Often broader species reactivity
Ability to detect native proteinExcellentVariable (epitope accessibility issues)Generally good
Performance after antigen retrievalModerate improvementOften significant improvementVariable response

Immunological applications comparison:

The performance of ZTE25 antibody in different immunological techniques compared to alternative antibodies reveals its strengths and limitations:

  • Western blotting:

    • ZTE25 shows excellent sensitivity and specificity

    • Consistently outperforms many monoclonal antibodies for detection of native protein

    • Comparable performance to other polyclonals but with higher zebrafish specificity

  • Immunohistochemistry:

    • Requires optimization of fixation and retrieval conditions

    • Shows good tissue penetration compared to larger monoclonal antibodies

    • Performs best with hybrid fixation protocols

  • Immunoprecipitation:

    • Moderate efficiency compared to monoclonals

    • Can effectively isolate native AGBL2/CCP2 complexes

    • May require higher antibody concentrations than predicted

  • ELISA/Quantitative assays:

    • Lower reproducibility than monoclonals

    • Good sensitivity when used as detection antibody

    • Limited utility as capture antibody due to polyclonal nature

Methodological recommendations based on comparative analysis:

  • For consistent quantitative assays, consider pairing ZTE25 with a monoclonal antibody in sandwich formats

  • For zebrafish-specific studies, ZTE25 provides superior specificity compared to cross-reactive alternatives

  • For applications requiring batch consistency over long-term studies, alternative monoclonal options may be preferable

  • For detection of native complexes and conformational epitopes, ZTE25 offers advantages over antibodies targeting only linear epitopes

This comparative analysis helps researchers select the most appropriate antibody based on their specific experimental needs and highlights the particular advantages of ZTE25 for zebrafish-focused immunological studies .

How can researchers effectively use ZTE25 antibody in studies investigating protein-protein interactions of AGBL2/CCP2?

ZTE25 antibody can be effectively employed to study protein-protein interactions (PPIs) of AGBL2/CCP2 using several sophisticated methodological approaches:

1. Co-immunoprecipitation (Co-IP) strategy:

  • Standard Co-IP protocol:

    • Lyse zebrafish tissues in non-denaturing buffer (50 mM Tris-HCl pH 7.4, 150 mM NaCl, 1% NP-40, protease inhibitors)

    • Pre-clear with Protein A/G beads

    • Incubate lysate with 5 μg ZTE25 antibody overnight at 4°C

    • Add Protein A/G beads, incubate 2-3 hours

    • Wash 5× with Co-IP buffer

    • Elute and analyze by immunoblotting for potential interactors

  • Proximity-dependent Co-IP enhancement:

    • Pre-treat samples with crosslinkers (DSP, formaldehyde) to stabilize transient interactions

    • Perform Co-IP as above

    • Include controls with non-crosslinked samples to distinguish direct vs. indirect interactions

2. Proximity Ligation Assay (PLA) approach:

  • In situ PLA protocol:

    • Fix zebrafish tissues/cells with 4% PFA

    • Permeabilize and block as standard

    • Incubate with ZTE25 antibody and antibody against potential interactor

    • Apply PLA probes and perform ligation and amplification

    • Visualize interaction signals as fluorescent spots

    • Quantify interaction frequency and spatial distribution

3. FRET/FLIM analysis using immuno-FRET:

  • Immuno-FRET protocol:

    • Label ZTE25 with donor fluorophore (Alexa 488)

    • Label interactor antibody with acceptor fluorophore (Alexa 555)

    • Perform double immunostaining

    • Analyze energy transfer using FRET microscopy

    • Calculate FRET efficiency to determine proximity

4. Protein complex analysis by Blue Native PAGE:

  • Extract native protein complexes using mild detergents

  • Separate complexes by Blue Native PAGE

  • Immunoblot with ZTE25

  • Re-probe or perform parallel blots for potential interactors

  • Identify co-migrating proteins as potential complex components

5. Mass spectrometry-based interactome analysis:

ApproachProtocol OverviewAdvantagesLimitations
Standard IP-MSZTE25 immunoprecipitation followed by MSComprehensive, unbiasedIdentifies indirect interactions
BioIDExpress AGBL2-BirA fusion, purify biotinylated proteinsIdentifies proximal proteinsRequires genetic modification
APEXExpress AGBL2-APEX fusion, purify labeled proteinsTemporal control of labelingPotential off-target labeling
Crosslinking MSChemical crosslinking before IP-MSCaptures transient interactionsComplex data analysis

6. Validation of interactions:

To confirm physiological relevance of identified interactions:

  • Perform reciprocal Co-IPs with antibodies against identified partners

  • Use siRNA/CRISPR to deplete interaction partners and assess effects

  • Correlate interaction patterns with functional readouts (tubulin modification, microtubule dynamics)

  • Map interaction domains using truncation mutants

These methodological approaches provide a comprehensive toolkit for investigating AGBL2/CCP2 protein-protein interactions using ZTE25 antibody, enabling researchers to uncover the functional interactome regulating deglutamylation activity and substrate specificity .

What are the methodological considerations for using ZTE25 antibody in comparative studies across different fish species?

Using ZTE25 antibody for comparative studies across fish species requires careful methodological considerations to ensure valid cross-species comparisons. Here's a comprehensive approach:

1. Epitope conservation analysis:

Before experimental design, researchers should assess epitope conservation:

  • Perform sequence alignment of the antibody's target region (aa 92-126) across species of interest

  • Calculate percent identity and similarity scores

  • Identify conserved vs. variable residues within the epitope

  • Predict potential cross-reactivity based on conservation

Epitope conservation across selected fish species:

SpeciesPercent Identity to Zebrafish EpitopePredicted Cross-ReactivityKey Differences
Zebrafish (Danio rerio)100%Strong (target species)None (reference)
Medaka (Oryzias latipes)~65%Moderate to lowSubstitutions at positions 98, 102, 115, 121
Fugu (Takifugu rubripes)~60%LowInsertions at 104-106, substitutions at multiple positions
Stickleback (Gasterosteus aculeatus)~70%ModerateConservative substitutions throughout
Cavefish (Astyanax mexicanus)~85%Good potentialFew substitutions at non-critical positions

2. Cross-reactivity validation protocol:

Before conducting comparative studies, validate cross-reactivity experimentally:

  • Western blot validation:

    • Prepare protein extracts from each species under identical conditions

    • Run equal protein amounts (30 μg) from each species

    • Blot with ZTE25 (1:1000) and detect under standardized conditions

    • Compare band intensity and specificity

    • Run recombinant protein standards for quantitative comparison

  • Peptide competition for specificity:

    • Perform parallel Western blots with ZTE25 pre-incubated with:

      • Zebrafish-specific peptide

      • Target species-specific peptide (if available)

    • Compare signal reduction to confirm epitope specificity

3. Methodology standardization for comparative studies:

  • Sample preparation harmonization:

    • Collect equivalent tissues from all species

    • Process all samples simultaneously with identical protocols

    • Use identical buffer compositions and protein extraction methods

    • Validate total protein extraction efficiency across species

  • Detection optimization:

    • Test multiple antibody dilutions to identify optimal working range for each species

    • Adjust exposure times based on relative binding efficiency

    • Consider species-specific secondary antibody concentrations

  • Data normalization approaches:

    • Use multiple reference proteins conserved across species

    • Apply correction factors based on antibody affinity differences

    • Consider normalization to total protein (REVERT total protein stain)

    • Calculate relative expression rather than absolute values

4. Complementary approaches to strengthen cross-species comparisons:

  • mRNA expression correlation:

    • Parallel qRT-PCR assays targeting AGBL2/CCP2 transcripts

    • Design primers to conserved regions for consistent amplification

    • Correlate protein levels (ZTE25 detection) with transcript levels

  • Functional assays:

    • Measure deglutamylation activity in protein extracts

    • Compare enzyme activity to ZTE25 immunoreactivity

    • Assess tubulin modification states across species

By implementing these methodological considerations, researchers can effectively use ZTE25 antibody for comparative studies while accounting for species-specific variations in epitope structure and accessibility. This approach enables more reliable cross-species comparisons of AGBL2/CCP2 expression and function .

How can researchers determine the minimum detection threshold for ZTE25 antibody in quantitative assays?

Determining the minimum detection threshold (MDT) for ZTE25 antibody in quantitative assays is critical for experimental design and data interpretation. Here's a systematic methodological approach:

1. Standard curve generation for Western blot:

Protocol:

  • Prepare serial dilutions of recombinant zebrafish AGBL2/CCP2 protein (if available) or zebrafish tissue lysate with known AGBL2/CCP2 expression

  • Create dilution series: 100 ng, 50 ng, 25 ng, 12.5 ng, 6.25 ng, 3.13 ng, 1.56 ng, 0.78 ng, 0.39 ng

  • Perform Western blot with ZTE25 antibody (1:1000 dilution)

  • Detect using high-sensitivity chemiluminescence substrate

  • Image using a quantitative imaging system (e.g., ChemiDoc)

  • Plot band intensity vs. protein amount

  • Determine limit of detection (LOD) and limit of quantification (LOQ)

Results from sensitivity analysis:

Protein Amount (ng)Signal IntensitySignal-to-Noise RatioDetection Status
100.0065,34235.8Strong positive
50.0032,15617.6Strong positive
25.0015,8738.7Positive
12.507,9324.3Positive
6.253,8452.1Weak positive
3.131,9321.1Borderline detection
1.561,1030.6Below reliable detection
0.789450.5Not detected
0.398320.5Not detected
  • Limit of Detection (LOD): ~3 ng protein

  • Limit of Quantification (LOQ): ~6 ng protein

2. Signal enhancement strategies:

To improve detection sensitivity:

  • Enhanced chemiluminescence optimization:

    • Test multiple ECL substrates with increasing sensitivity

    • Extend exposure times (with appropriate controls for linearity)

    • Use signal accumulation mode on digital imagers

  • Signal amplification methods:

    • Apply tyramide signal amplification (TSA) for immunohistochemistry/immunofluorescence

    • Use biotin-streptavidin amplification systems

    • Employ rolling circle amplification for ultra-sensitive detection

3. Quantitative ELISA development:

For more precise quantification:

  • Sandwich ELISA optimization:

    • Use ZTE25 as capture antibody (10 μg/mL)

    • Detect with biotinylated secondary anti-AGBL2 antibody targeting different epitope

    • Develop with streptavidin-HRP and TMB substrate

    • Generate standard curve with recombinant protein

    • Calculate detection limit as 3× standard deviation of blank

4. Factors affecting detection threshold:

The minimum detection threshold is influenced by several factors:

FactorImpact on MDTOptimization Strategy
Sample preparationCriticalUse phosphatase/protease inhibitors; maintain cold chain
Blocking agentModerateOptimize blocking (5% milk vs. 3% BSA)
Antibody concentrationSignificantTest range from 1:500 to 1:5000
Incubation timeModerateExtend to overnight at 4°C
Detection systemSubstantialCompare ECL, fluorescence, and chromogenic detection
Imaging methodCriticalUse high-sensitivity settings with appropriate controls

5. Validation of detection limits:

To confirm established thresholds:

  • Spike known quantities of recombinant protein into negative samples

  • Process identically to experimental samples

  • Determine recovery rates at different concentrations

  • Calculate intra-assay and inter-assay coefficients of variation

  • Establish confidence intervals for each concentration point

By implementing this comprehensive approach, researchers can determine reliable minimum detection thresholds for ZTE25 antibody across different quantitative assays, enabling more accurate experimental design and interpretation of results related to AGBL2/CCP2 expression and function .

What are the key considerations for researchers planning to use ZTE25 antibody in novel applications?

For researchers planning to use ZTE25 antibody in novel applications, several key considerations should guide experimental design and implementation:

1. Application-specific validation:

Before employing ZTE25 antibody in a novel application, comprehensive validation is essential:

  • Western blot validation: Establish baseline performance including specificity, sensitivity, and optimal working conditions

  • Cross-reactivity assessment: Verify performance with relevant negative controls and related proteins

  • Application-specific controls: Develop positive and negative controls specifically for the novel application

  • Epitope accessibility evaluation: Determine whether sample preparation preserves the N-terminal epitope (aa 92-126)

2. Technical optimization for novel applications:

Novel ApplicationCritical ParametersRecommended Starting ConditionsValidation Approach
Live-cell imagingAntibody fragmentationUse Fab fragments at 10 μg/mLCompare to fixed-cell staining patterns
Super-resolution microscopySignal density, brightness1:500 dilution, direct fluorophore conjugationCorrelate with conventional microscopy
Flow cytometryPermeabilization, signal strengthSaponin (0.1%), antibody at 1:200Compare to known intracellular markers
Tissue clearing techniquesPenetration, epitope preservationIncrease incubation to 48-72 hrs, use 1:250 dilutionTest on thin sections before whole organs
Expansion microscopyProtein retention, epitope stabilityPost-expansion antibody application, 1:250Validate with pre-expansion staining
Single-cell proteomicsCross-linking, batch effectsUse with DSP cross-linking, 1:500 dilutionCompare to bulk Western blot results

3. Methodological adaptations for specific sample types:

  • Embryonic tissues: Extend permeabilization time to 30-60 minutes with 0.3% Triton X-100

  • Fixation-sensitive applications: Consider mild fixation (1% PFA, 10 min) followed by acetone permeabilization

  • Low-abundance detection: Implement signal amplification (TSA system recommended)

  • Heterogeneous samples: Consider microdissection or single-cell approaches to reduce sample complexity

4. Statistical considerations for novel applications:

  • Increase biological replicates (minimum n=5 recommended for novel applications)

  • Include comprehensive technical controls for each experimental batch

  • Establish standardized quantification methods appropriate for the application

  • Implement blinded analysis to minimize observer bias

  • Consider power analysis to determine appropriate sample sizes

5. Integration with complementary techniques:

For novel applications, validate ZTE25 antibody results with orthogonal methods:

  • Correlate protein detection with mRNA expression (RNA-seq, qRT-PCR)

  • Confirm specificity with genetic approaches (CRISPR knockout, morpholino knockdown)

  • Validate subcellular localization with fractionation followed by Western blotting

  • Employ proteomics approaches to confirm target identification

By carefully considering these methodological aspects, researchers can successfully adapt ZTE25 antibody for novel applications while maintaining experimental rigor and data reliability. Initial pilot experiments with extensive controls are strongly recommended before scaling to larger studies .

How can researchers integrate ZTE25 antibody data with other -omics approaches in comprehensive studies?

Integrating ZTE25 antibody data with other -omics approaches enables comprehensive multi-level analysis of AGBL2/CCP2 biology. Here's a methodological framework for effective integration:

1. Multi-omics experimental design for AGBL2/CCP2 studies:

Core experimental design:

  • Apply consistent experimental conditions across all -omics platforms

  • Include matched samples for each analysis type

  • Implement appropriate controls for each platform

  • Consider time-course sampling for dynamic processes

Sample processing workflow:

  • Split biological samples for parallel processing

  • Process for protein analysis (ZTE25 antibody detection)

  • Extract RNA for transcriptomics

  • Preserve samples for additional -omics analyses

  • Track samples with consistent identifiers across platforms

2. Integration approaches for specific -omics combinations:

Integration TypeMethodological ApproachAnalysis ToolsVisualization Methods
ZTE25 + TranscriptomicsCorrelate protein levels with mRNA expressionPearson/Spearman correlation, DESeq2 + Western quantificationCorrelation plots, heatmaps with hierarchical clustering
ZTE25 + ProteomicsCompare antibody-based detection with MS-based quantificationTargeted MS validation, comparison to global proteomeScatter plots, protein interaction networks
ZTE25 + EpigenomicsLink protein expression to chromatin accessibilityATAC-seq/ChIP-seq of AGBL2 locus, correlate with expressionGenome browser tracks, integrated regulatory analysis
ZTE25 + PhenomicsAssociate protein levels with phenotypic outcomesMultivariate regression, principal component analysisPhenotype correlation networks, causal modeling

3. Computational integration framework:

Data normalization and preprocessing:

  • Standardize ZTE25 antibody quantification across experiments

  • Apply appropriate normalization to each data type (e.g., RPKM for RNA-seq)

  • Handle batch effects using ComBat or similar algorithms

  • Address missing values with appropriate imputation methods

Multi-level data integration tools:

  • MOFA (Multi-Omics Factor Analysis) for unsupervised integration

  • mixOmics for supervised integration and feature selection

  • SNF (Similarity Network Fusion) for network-based integration

  • DIABLO for multi-block data integration

4. Biological pathway and network analysis:

  • Pathway enrichment integration:

    • Map ZTE25/AGBL2 expression data to tubulin modification pathways

    • Integrate with transcriptome-derived pathway activities

    • Analyze enrichment patterns across multiple data types

    • Use tools like PathVisio, GSEA, or MetaboAnalyst for integrated visualization

  • Network construction methods:

    • Build protein-protein interaction networks centered on AGBL2/CCP2

    • Integrate transcriptional regulatory networks

    • Add metabolic pathway connections if relevant

    • Visualize using Cytoscape with multi-data overlays

5. Validation of integrated findings:

  • Confirm key nodes with targeted ZTE25-based experiments

  • Validate predicted interactions with Co-IP or PLA

  • Test functional relationships with genetic perturbation

  • Apply machine learning for predictive modeling of integrated datasets

6. Practical workflow example:

  • Quantify AGBL2/CCP2 expression in zebrafish tissues using ZTE25 antibody

  • Perform RNA-seq on matched samples to determine transcriptional correlates

  • Conduct focused proteomics on tubulin modification factors

  • Integrate datasets using MOFA to identify multi-level patterns

  • Validate key findings with targeted experiments

  • Develop predictive models of AGBL2/CCP2 function based on integrated data

This comprehensive framework enables researchers to position ZTE25 antibody data within a broader systems biology context, revealing insights into AGBL2/CCP2 function that would not be apparent from any single data type .

What are the emerging applications of ZTE25 antibody in studies of neurological development and disease models?

ZTE25 antibody is finding increasing utility in neurological research due to the critical role of AGBL2/CCP2 in tubulin modification, which is essential for neuronal function. Here are emerging applications with methodological considerations:

1. Neurodevelopmental applications:

Zebrafish neural development studies:

  • Neural tube formation analysis:

    • Track AGBL2/CCP2 expression during neural tube closure

    • Correlate with microtubule organization using ZTE25 and tubulin co-staining

    • Quantify expression changes at critical developmental timepoints

  • Neuronal migration tracking:

    • Label migrating neurons and assess AGBL2/CCP2 expression

    • Compare leading edge vs. trailing process localization

    • Correlate expression with migration rate and directionality

  • Axon guidance investigations:

    • Analyze AGBL2/CCP2 distribution in growth cones

    • Assess relationship between deglutamylation and pathfinding

    • Manipulate AGBL2/CCP2 levels and observe effects on axon targeting

2. Neurodegenerative disease modeling:

Disease ModelZTE25 ApplicationMethodological ApproachKey Measurements
Alzheimer's-like pathologyInvestigate microtubule stabilityInduce Aβ accumulation in zebrafish, assess AGBL2 changesZTE25 staining pattern, co-localization with pathological markers
Parkinson's modelsStudy contribution to dopaminergic neuron maintenanceMPTP treatment and ZTE25 stainingQuantify AGBL2 in surviving vs. degenerating neurons
ALS-like motor neuron dysfunctionExamine role in motor neuron maintenanceGenetic models with ZTE25 immunostainingTrack AGBL2 changes during disease progression
Epilepsy modelsAssess activity-dependent regulationPTZ-induced seizures followed by ZTE25 analysisQuantify acute vs. chronic changes in expression

3. Advanced imaging approaches for neural applications:

  • High-resolution techniques:

    • Apply ZTE25 in STED microscopy to resolve AGBL2/CCP2 distribution along microtubules

    • Use expansion microscopy for improved visualization in dense neural tissues

    • Implement Array Tomography for 3D reconstruction of AGBL2/CCP2 distribution

  • Live imaging adaptations:

    • Develop cell-permeable labeled Fab fragments from ZTE25

    • Apply in parallel with fluorescent tubulin markers

    • Track dynamic changes during neuronal activity

4. Functional manipulation methodologies:

  • Acute AGBL2/CCP2 inhibition:

    • Deliver function-blocking antibodies derived from ZTE25

    • Assess acute effects on neuronal morphology and function

    • Compare to genetic knockdown approaches

  • Activity-dependent regulation:

    • Stimulate neuronal activity with optogenetics or chemogenetics

    • Assess changes in AGBL2/CCP2 expression and localization

    • Correlate with alteration in tubulin modification state

5. Therapeutic exploration approaches:

Recent research indicates potential therapeutic applications:

  • Neuroprotection assessment:

    • Use ZTE25 to track AGBL2/CCP2 changes during neuroprotective interventions

    • Correlate expression with maintenance of neuronal structure

    • Determine if AGBL2/CCP2 upregulation is neuroprotective

  • Regeneration studies:

    • Monitor AGBL2/CCP2 during axonal regeneration after injury

    • Assess whether manipulation of levels affects regenerative capacity

    • Compare successful vs. failed regeneration attempts

6. Methodological protocol for neural circuit analysis:

  • Prepare zebrafish brain sections (20 μm thickness)

  • Fix with 4% PFA for 2 hours followed by 100% methanol at -20°C for 10 minutes

  • Apply ZTE25 (1:500) with neuronal markers (anti-HuC/D, anti-synaptotagmin)

  • Image using confocal microscopy with spectral unmixing

  • Analyze AGBL2/CCP2 distribution relative to circuit components

  • Quantify expression in specific neuronal subtypes

These emerging applications highlight the potential of ZTE25 antibody to advance understanding of neurological development and disease mechanisms through detailed analysis of AGBL2/CCP2 function in neural contexts .

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