CHX3 Antibody

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Description

Overview of CHX-A''-DTPA in Antibody Engineering

CHX-A''-DTPA (cyclohexyl-diethylenetriaminepentaacetic acid) is a bifunctional chelator critical for radiolabeling monoclonal antibodies (mAbs). It enables conjugation with radioisotopes (e.g., 111In^{111}\text{In}, 177Lu^{177}\text{Lu}) for diagnostic imaging or targeted therapy .

MORAb-009 (Anti-Mesothelin Antibody)

  • Target: Mesothelin (overexpressed in mesothelioma, pancreatic, and ovarian cancers) .

  • Conjugate: 111In^{111}\text{In}-CHX-A''-DTPA-MORAb-009.

  • Results:

    ParameterValue (H2052 Tumors)Value (A431/K5 Tumors)
    Tumor Uptake (%ID/g)>25% (48h)>15% (48h)
    Liver/Spleen Uptake<20% ID/g>30% ID/g
    SpecificityHigh (vs. A431 controls)Moderate (antigen shedding)
    • Implication: Optimal protein doses (30–100 µg) enhance tumor-to-background ratios .

067-213 (Anti-CD73 Antibody)

  • Target: CD73 (immunotherapy biomarker in pancreatic cancer) .

  • Conjugate: 111In^{111}\text{In}-CHX-A''-DTPA-067-213.

  • Results:

    • Binding Affinity: Kd=0.72nMK_d = 0.72 \, \text{nM} (post-conjugation vs. 0.85 nM for native antibody) .

    • Tumor Uptake: 54.0% ± 5.7% in MIAPaCa-2 (high CD73) vs. 43.5% ± 3.6% in A431 (low CD73) .

    • Safety: Low normal-organ uptake in rats (liver: <10% ID/g) .

seeMet Antibodies (Anti-cMet)

  • Target: cMet receptor (gastrointestinal cancers) .

  • Conjugate: 177Lu^{177}\text{Lu}-CHX-A''-DTPA-seeMet 12.

  • Results:

    • Growth Inhibition: Dose-dependent suppression in MKN-45 and HT-29 cells (p<0.0001p < 0.0001) .

    • Radiosensitivity: Enhanced tumor kill in combination with sorafenib .

Mechanistic Insights

Antibody ConjugateIsotopeClinical PhaseKey Mechanism
MORAb-009111In^{111}\text{In}PreclinicalMesothelin imaging/therapy
067-213111In^{111}\text{In}PreclinicalCD73 expression monitoring
seeMet 12177Lu^{177}\text{Lu}PreclinicalcMet inhibition + radioisotopes

Challenges and Innovations

  • Bone Uptake: CHX-DTPA conjugates show higher bone retention than DOTA variants (e.g., 5.8% ID/g vs. 1.07% ID/g in spine) .

  • Stability: CHX-A''-DTPA minimizes affinity loss (<10%) post-conjugation .

  • Clinical Translation: Phase I trials for MORAb-009 and seeMet 12 demonstrate safety and efficacy .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
CHX3 antibody; CHX03 antibody; At5g22900 antibody; MRN17.13Cation/H(+) antiporter 3 antibody; Protein CATION/H+ EXCHANGER 3 antibody; AtCHX3 antibody
Target Names
CHX3
Uniprot No.

Target Background

Function
CHX3 Antibody may function as a cation/H(+) antiporter.
Database Links

KEGG: ath:AT5G22900

STRING: 3702.AT5G22900.1

UniGene: At.54954

Protein Families
Monovalent cation:proton antiporter 2 (CPA2) transporter (TC 2.A.37) family, CHX (TC 2.A.37.4) subfamily
Subcellular Location
Membrane; Multi-pass membrane protein.

Q&A

What is CHX3 and what role does it play in Arabidopsis thaliana?

CHX3 (Cation/H+ Exchanger 3) is a protein found in Arabidopsis thaliana that belongs to the family of cation/H+ exchangers. These membrane transporters are involved in ion homeostasis, particularly K+ transport and pH regulation in plant cells. CHX3 is expressed in various tissues and plays important roles in cellular ion balance, membrane potential maintenance, and stress responses in plants.

What detection methods are validated for CHX3 Antibody use?

Based on available product information, the commercially available CHX3 Antibody has been validated for ELISA and Western Blot applications . These applications enable researchers to detect and quantify CHX3 protein in research samples. When planning experiments, researchers should consider:

  • ELISA: Suitable for quantitative detection in solution

  • Western Blot: Appropriate for detection and size confirmation after electrophoretic separation

  • Potential for optimization in other immunological applications with proper validation

What are the recommended storage conditions for maintaining CHX3 Antibody activity?

For optimal stability and performance, antibodies should generally be stored according to these guidelines:

  • Long-term storage: -20°C to -80°C, with preference for -80°C for extended periods

  • Working aliquots: 4°C for 1-2 weeks to minimize freeze-thaw cycles

  • Avoid repeated freeze-thaw cycles by preparing single-use aliquots

  • Store in manufacturer-recommended buffer conditions

  • Consider addition of stabilizing proteins (BSA) for diluted working solutions

Always refer to specific manufacturer recommendations, as formulation differences may affect stability profiles.

What controls are essential when using CHX3 Antibody in immunological assays?

A robust experimental design incorporating appropriate controls is crucial for reliable results. When working with CHX3 Antibody, include:

Control TypePurposeImplementation
Positive ControlVerify antibody functionalitySample known to express CHX3 (e.g., specific Arabidopsis tissues)
Negative ControlAssess non-specific bindingSample lacking CHX3 expression or knockout/knockdown line
Technical ControlEvaluate methodologySecondary antibody-only control
Loading ControlEnsure equal sample loadingDetection of housekeeping protein (e.g., actin, tubulin)
Blocking PeptideConfirm specificityPre-incubation of antibody with immunizing peptide

The implementation of these controls enables confident interpretation of results and troubleshooting of unexpected observations.

How should researchers optimize protein extraction protocols for CHX3 detection in plant tissues?

Plant tissues contain various compounds that can interfere with antibody-antigen interactions. Consider these methodological approaches:

  • Include reducing agents (DTT, β-mercaptoethanol) to disrupt disulfide bonds

  • Add protease inhibitor cocktails to prevent protein degradation

  • Incorporate PVPP or similar compounds to remove phenolic compounds

  • Use detergents appropriate for membrane proteins (CHAPS, Triton X-100)

  • Optimize buffer pH and ionic strength based on CHX3 biochemical properties

  • Consider subcellular fractionation if CHX3 signal is weak in total extracts

Sample preparation quality significantly impacts downstream detection sensitivity and specificity.

How can researchers address cross-reactivity concerns when studying CHX family members?

The CHX family in Arabidopsis contains multiple members with potential sequence homology. To ensure specificity:

  • Perform sequence alignment analysis to identify unique epitopes

  • Validate specificity using genetic knockouts or knockdowns

  • Conduct peptide competition assays with related CHX peptides

  • Consider immunoprecipitation followed by mass spectrometry identification

  • Correlate protein detection with transcript analysis using qRT-PCR

A multi-method validation approach substantially increases confidence in antibody specificity determinations.

What strategies can improve CHX3 detection in challenging samples?

When CHX3 detection proves difficult, consider these methodological adjustments:

  • Signal enhancement approaches:

    • Amplification systems (biotin-streptavidin, tyramide)

    • Extended substrate incubation times

    • Sensitivity-optimized detection reagents

  • Background reduction methods:

    • Longer/additional washing steps

    • Alternative blocking agents (fish gelatin, plant-derived proteins)

    • Pre-adsorption of secondary antibodies

  • Sample enrichment techniques:

    • Membrane fractionation

    • Immunoprecipitation

    • Protein concentration methods

Systematic optimization of these parameters often resolves detection challenges.

How should researchers quantitatively analyze Western blot data for CHX3 expression?

For rigorous quantification of Western blot results:

  • Use calibrated image acquisition systems with linear dynamic range

  • Include protein loading standards at multiple concentrations

  • Employ image analysis software for densitometry

  • Normalize to appropriate loading controls

  • Present data with statistical analysis across biological replicates (n≥3)

The following formula may be used for relative quantification:
Relative CHX3 Expression=CHX3 Band IntensityLoading Control Intensity×Normalization Factor\text{Relative CHX3 Expression} = \frac{\text{CHX3 Band Intensity}}{\text{Loading Control Intensity}} \times \text{Normalization Factor}

What approaches should be used when CHX3 antibody produces unexpected banding patterns?

Multiple bands in Western blots may reflect:

  • Post-translational modifications

  • Alternative splice variants

  • Proteolytic processing

  • Non-specific binding

Analytical approaches include:

  • Comparison with predicted molecular weights

  • Treatment with phosphatases or glycosidases

  • Correlation with transcript analysis

  • Comparison across tissue types and experimental conditions

  • Peptide competition assays

Systematic documentation and analysis of band patterns across multiple experiments enables confident interpretation.

How can CHX3 Antibody be utilized in protein-protein interaction studies?

To investigate CHX3 protein interactions:

  • Co-immunoprecipitation (Co-IP):

    • Use CHX3 antibody to precipitate protein complexes

    • Analyze by mass spectrometry or Western blot

  • Proximity ligation assay (PLA):

    • Visualize protein interactions with spatial resolution

    • Particularly useful for membrane proteins

  • Pull-down assays:

    • Use recombinant CHX3 as bait for interacting partners

    • Combine with mass spectrometry for unbiased discovery

  • Split reporter systems:

    • BiFC or split luciferase for in vivo validation

    • Provides spatial information about interactions

Each technique offers complementary information about protein interaction networks.

What considerations are important when using CHX3 Antibody in stress response studies?

When investigating CHX3 expression under various stress conditions:

  • Experimental design considerations:

    • Include time-course analyses to capture dynamic responses

    • Standardize tissue collection protocols

    • Control for circadian or developmental effects

  • Technical considerations:

    • Use multiple reference genes/proteins that remain stable under stress

    • Implement randomized processing to avoid batch effects

    • Include technical and biological replicates

  • Data interpretation:

    • Consider post-translational modifications induced by stress

    • Correlate protein changes with functional assays

    • Compare with transcriptional responses

How can researchers validate CHX3 Antibody for immunolocalization studies?

For subcellular localization studies:

  • Fixation optimization:

    • Test multiple fixatives (paraformaldehyde, glutaraldehyde)

    • Optimize fixation times and temperatures

  • Permeabilization methods:

    • Evaluate detergents (Triton X-100, saponin)

    • Consider enzyme-based approaches for dense tissues

  • Antibody validation:

    • Use known CHX3 expression patterns as positive controls

    • Include knockout/knockdown lines as negative controls

    • Perform peptide competition assays

  • Co-localization with subcellular markers:

    • Use established organelle markers

    • Quantify co-localization using appropriate algorithms

Systematic optimization enables confident interpretation of subcellular distribution patterns.

What statistical approaches are appropriate for analyzing CHX3 expression across experimental conditions?

For robust statistical analysis:

  • Experimental design considerations:

    • Power analysis to determine sample size

    • Biological replicates (n≥3)

    • Technical replicates

  • Data distribution assessment:

    • Test for normality (Shapiro-Wilk test)

    • Evaluate homogeneity of variance

  • Statistical tests:

    • For normally distributed data: t-tests, ANOVA with post-hoc tests

    • For non-parametric data: Mann-Whitney, Kruskal-Wallis

  • Multiple testing correction:

    • Bonferroni correction for conservative approach

    • False Discovery Rate for less stringent correction

  • Data visualization:

    • Box plots or violin plots to show distribution

    • Include individual data points

Rigorous statistical approach ensures reliable interpretation of experimental results.

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