CYP28 Antibody

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Description

What Is CYP2C8 Antibody?

CYP2C8 antibodies are immunoreagents designed to detect and quantify the CYP2C8 enzyme, a member of the cytochrome P450 superfamily involved in xenobiotic metabolism and arachidonic acid processing . These antibodies enable researchers to study CYP2C8's expression, localization, and function in tissues like the liver, heart, and vascular endothelium .

General Properties

PropertyDetailsSources
Target specificityCross-reactivity with CYP2C9/18/19 due to high sequence homology
Host speciesRabbit (polyclonal)
ApplicationsWestern blot (WB), immunohistochemistry (IHC), ELISA
Observed molecular weight48–50 kDa (slightly lower than predicted 56 kDa due to post-translational modifications)

Recommended Dilutions

ApplicationDilution RangeBuffer/Conditions
Western Blot1:2,000–1:10,000PBS with 0.02% sodium azide, 50% glycerol
IHC1:300–1:1,200Antigen retrieval with TE buffer (pH 9.0) or citrate buffer (pH 6.0) recommended
ELISACustom titrationDependent on sample type and experimental setup

Role in Drug Metabolism

CYP2C8 metabolizes clinically significant drugs, including:

  • Paclitaxel (anticancer agent)

  • Rosiglitazone (antidiabetic)

  • Cerivastatin (cholesterol-lowering drug) .

Genetic polymorphisms (e.g., CYP2C83, CYP2C84) alter enzyme activity, affecting drug efficacy and toxicity. For example:

  • 20–60% of African and European populations carry reduced-function alleles linked to adverse drug reactions .

Cardiovascular Implications

CYP2C8 generates epoxyeicosatrienoic acids (EETs), which regulate vascular tone and blood pressure . Key findings include:

  • Co-expression with CYP2J2 in coronary artery endothelium .

  • Inhibition by sulfaphenazole (CYP2C9 blocker) reduces ischemic cardiac damage .

Antibody Validation Data

Study FocusKey ObservationsSource
Liver tissue analysisStrong reactivity in human/mouse/rat liver lysates (WB)
Tumor localizationDetectable in human liver cancer tissues (IHC)
Subcellular mappingLocalized to endoplasmic reticulum in hepatocytes (immunofluorescence)

Challenges and Limitations

  • Cross-reactivity: Antibodies may bind CYP2C9/18/19 due to >80% sequence homology .

  • Band discrepancies: Observed molecular weight (50 kDa) differs from predicted 56 kDa, necessitating careful validation .

Future Directions

  • Development of isoform-specific antibodies to distinguish CYP2C8 from homologous enzymes.

  • Pharmacogenomic studies to optimize drug dosing in carriers of CYP2C8 polymorphisms .

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
CYP28 antibody; At5g35100 antibody; F7N22.3Peptidyl-prolyl cis-trans isomerase CYP28 antibody; chloroplastic antibody; PPIase CYP28 antibody; EC 5.2.1.8 antibody; Cyclophilin of 28 kDa antibody; Cyclophilin-28 antibody
Target Names
CYP28
Uniprot No.

Target Background

Function
Peptidyl-prolyl isomerases (PPIases) play a crucial role in protein folding by catalyzing the cis-trans isomerization of proline imidic peptide bonds within oligopeptides.
Database Links

KEGG: ath:AT5G35100

STRING: 3702.AT5G35100.1

UniGene: At.27662

Protein Families
Cyclophilin-type PPIase family
Subcellular Location
Plastid, chloroplast.
Tissue Specificity
Ubiquitous. Not detected in roots.

Q&A

What is CYP28 and what is its primary function in biological systems?

CYP28, also known as CYCLOPHILIN28, is a member of the cyclophilin-like peptidyl-prolyl cis-trans isomerase family of proteins. It functions primarily in photosystem II and light-harvesting complex II (LHC II) supercomplex assembly in plant systems, particularly in Arabidopsis thaliana . The protein exhibits peptidyl-prolyl cis-trans isomerase (PPIase) activity, which is essential for protein folding by catalyzing the isomerization of peptide bonds at proline residues. Two specific amino acid residues, K113 and E187, have been identified as essential for this PPIase activity . This enzyme plays a critical role in maintaining photosynthetic efficiency by ensuring proper assembly of protein complexes involved in light capture and energy conversion.

How does the structure of CYP28 relate to its functional properties?

The structure of CYP28 contains specific functional domains characteristic of cyclophilin family proteins. Most critically, the amino acid residues K113 and E187 are essential for its peptidyl-prolyl cis-trans isomerase (PPIase) activity . These residues likely form part of the active site involved in catalyzing the isomerization of peptide bonds. The protein's structure enables it to interact with components of photosystem II and the light-harvesting complex II (LHC II) supercomplex, facilitating proper assembly of these photosynthetic machinery components . While the complete three-dimensional structure has not been fully characterized in the provided sources, the functional domains responsible for protein-protein interactions during photosystem assembly would be expected to be conserved across related plant species.

What are the standard methods for detecting CYP28 in research samples?

Detection of CYP28 in research samples typically employs immunological techniques using specific anti-CYP28 antibodies. The antibody available commercially is designed for recognizing the CYP28 protein in Arabidopsis thaliana samples . Standard detection methods include:

  • Western blotting: This technique allows for the identification and semi-quantification of CYP28 protein in plant tissue lysates. Samples are typically denatured, separated by SDS-PAGE, transferred to a membrane, and probed with anti-CYP28 antibody.

  • Immunohistochemistry: For localization studies examining the spatial distribution of CYP28 within plant tissues.

  • ELISA: For quantitative measurements of CYP28 levels in tissue extracts.

  • Immunoprecipitation: For isolation of CYP28 protein complexes to study interaction partners.

These methods can be optimized based on the methodological approaches established for other cytochrome-related proteins as described in literature for CYP family proteins .

What controls should be included when validating CYP28 antibody specificity?

When validating CYP28 antibody specificity for research applications, several critical controls should be implemented:

  • Positive control: Include purified recombinant CYP28 protein or extracts from tissues known to express high levels of CYP28 (such as photosynthetically active plant tissues) .

  • Negative control: Utilize samples from CYP28 knockout or knockdown plants, if available, or tissues known not to express CYP28.

  • Peptide competition assay: Pre-incubate the antibody with excess purified CYP28 peptide (immunogen) before the detection procedure. Signal disappearance confirms specificity.

  • Cross-reactivity assessment: Test the antibody against closely related cyclophilin family members to ensure it doesn't cross-react with other PPIases.

  • Western blot mobility verification: Confirm that the detected protein band appears at the expected molecular weight for CYP28.

This validation approach mirrors established protocols used for other CYP family antibodies, where specificity testing is critical for accurate experimental interpretation .

How can researchers distinguish between CYP28 and other cyclophilin family members in experimental systems?

Distinguishing CYP28 from other cyclophilin family members requires a multi-faceted approach:

  • Highly specific antibodies: Use antibodies raised against unique epitopes of CYP28 that are not shared with other cyclophilin family members . The commercial CYP28 antibody targeting Arabidopsis thaliana is designed for such specificity.

  • Molecular weight differentiation: CYP28 will migrate at a specific molecular weight on SDS-PAGE gels that may differ from other cyclophilin proteins. Careful calibration with protein standards allows for discrimination based on size.

  • Mass spectrometry analysis: After immunoprecipitation, mass spectrometry can provide definitive identification based on unique peptide sequences specific to CYP28.

  • Expression pattern analysis: CYP28 may have tissue-specific or subcellular localization patterns distinct from other cyclophilins, particularly in photosynthetic tissues where it functions in photosystem II assembly .

  • Functional assays: Since K113 and E187 are essential for CYP28's PPIase activity , mutational studies affecting these residues could help distinguish it functionally from other cyclophilins.

These approaches parallel methods used to distinguish between highly homologous CYP enzymes such as CYP2C8 and CYP2C9, which require specific antibodies and primers due to their extensive homology .

What are the methodological considerations for using CYP28 antibodies in studies of photosystem II assembly?

When investigating photosystem II assembly using CYP28 antibodies, researchers should consider these methodological aspects:

  • Sample preparation optimization: Photosynthetic complexes are membrane-associated and sensitive to degradation. Use gentle detergents and maintain low temperatures during extraction to preserve native complexes.

  • Co-immunoprecipitation protocols: For studying CYP28 interactions with other photosystem II components, optimize buffer conditions that maintain protein-protein interactions while allowing effective antibody binding.

  • Blue native PAGE: Consider using this technique in conjunction with CYP28 antibodies for Western blotting to analyze intact photosystem II supercomplexes.

  • Chloroplast isolation and fractionation: Implement subcellular fractionation to enrich for thylakoid membranes before immunological detection to improve sensitivity.

  • Time course experiments: Since CYP28 is involved in assembly processes, design experiments that capture dynamic assembly states following light exposure or during chloroplast development.

  • Crosslinking approaches: Consider chemical crosslinking prior to immunoprecipitation to capture transient interactions between CYP28 and other photosystem components.

These approaches should be implemented with appropriate controls similar to those used in studies of other enzyme systems involved in complex formation .

How do experimental conditions affect CYP28 antibody performance in different assays?

The performance of CYP28 antibodies across different experimental assays can be significantly influenced by several conditions:

  • Buffer composition:

    • For Western blotting: Phosphate-buffered saline with 0.1% Tween-20 (PBST) is typically effective

    • For immunoprecipitation: Milder detergents like NP-40 or Triton X-100 at 0.5-1% concentration help preserve protein interactions

  • Temperature considerations:

    • Antibody incubations at 4°C overnight often improve specificity compared to shorter incubations at room temperature

    • For plant samples, maintain cold temperatures during extraction to prevent degradation by released proteases

  • Blocking reagents:

    • BSA (3-5%) may be preferable to milk for phospho-specific epitopes

    • Testing both blocking agents can identify optimal conditions for CYP28 detection

  • Antigen retrieval (for fixed tissues):

    • Heat-induced epitope retrieval may be necessary for formalin-fixed plant tissues

    • pH optimization during antigen retrieval can significantly impact epitope accessibility

  • Antibody concentration:

    • Titration experiments should determine optimal concentration for each application

    • Higher concentrations may be needed for immunohistochemistry than Western blotting

These considerations align with methodological approaches used for other CYP family antibodies in research settings .

What is the optimal protocol for using CYP28 antibodies in Western blotting?

The optimal Western blotting protocol for CYP28 antibody includes these critical steps:

  • Sample preparation:

    • Homogenize plant tissue in ice-cold extraction buffer containing protease inhibitors

    • Centrifuge at 10,000-15,000 g to remove debris

    • For membrane-associated proteins, include 1% Triton X-100 or similar detergent in the extraction buffer

  • Protein separation:

    • Load 20-50 μg total protein per lane on 10-12% SDS-PAGE gel

    • Include positive control (recombinant CYP28) and molecular weight markers

  • Transfer conditions:

    • Transfer to PVDF membrane (preferable over nitrocellulose for this application)

    • Use standard transfer buffer with 20% methanol

    • Transfer at 100V for 1 hour or 30V overnight at 4°C

  • Blocking and antibody incubation:

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

    • Incubate with CYP28 antibody at 1:1000 dilution in blocking buffer overnight at 4°C

    • Wash 3-4 times with TBST, 5-10 minutes each

    • Incubate with HRP-conjugated secondary antibody (1:5000) for 1 hour at room temperature

  • Detection:

    • Develop using enhanced chemiluminescence (ECL) substrate

    • Expected molecular weight should be verified against recombinant standards

This protocol incorporates principles used for detection of other CYP proteins in research settings , adapted for plant tissue samples containing CYP28.

How should researchers optimize storage and handling of CYP28 antibodies to maintain activity?

Proper storage and handling of CYP28 antibodies is crucial for maintaining their activity and specificity:

  • Long-term storage:

    • Store lyophilized antibody at -20°C as indicated in the product information

    • After reconstitution, prepare small aliquots to avoid repeated freeze-thaw cycles

    • Add preservatives like 0.02% sodium azide for reconstituted antibodies stored at 4°C

  • Reconstitution protocol:

    • Use sterile techniques when reconstituting lyophilized antibody

    • Allow the vial to reach room temperature before opening to prevent condensation

    • Reconstitute in sterile buffer as recommended by manufacturer

  • Freeze-thaw considerations:

    • Minimize freeze-thaw cycles; each cycle can reduce antibody activity by ~10-20%

    • Use a manual defrost freezer as specified in the product information

    • Consider adding 50% glycerol to aliquots for storage at -20°C to prevent freezing

  • Working dilution handling:

    • Prepare fresh working dilutions on the day of experiment when possible

    • If storing diluted antibody, keep at 4°C and use within 1-2 weeks

    • Add BSA (0.1-1%) to diluted antibody solutions to prevent adsorption to tube walls

  • Transportation:

    • Transport on ice or cold packs

    • Avoid exposure to extreme temperatures during shipping

These storage recommendations align with standard practices for maintaining antibody stability and activity across experimental applications .

What approaches can researchers use to troubleshoot non-specific binding with CYP28 antibodies?

When encountering non-specific binding with CYP28 antibodies, researchers can implement these troubleshooting approaches:

  • Optimize blocking conditions:

    • Test different blocking agents (BSA, casein, commercial blocking reagents)

    • Increase blocking time or concentration (from 1 hour to overnight)

    • Add 0.1-0.3% Tween-20 to blocking buffer to reduce hydrophobic interactions

  • Modify antibody incubation parameters:

    • Reduce primary antibody concentration (try serial dilutions from 1:500 to 1:5000)

    • Decrease incubation temperature (4°C instead of room temperature)

    • Add 0.1-0.5% non-ionic detergent to antibody dilution buffer

  • Increase stringency of washes:

    • Extend washing time (15-20 minutes per wash instead of 5-10)

    • Increase number of washes (5-6 washes instead of 3-4)

    • Add higher salt concentration to wash buffer (up to 500 mM NaCl)

  • Pre-adsorption strategies:

    • Pre-incubate diluted antibody with extract from a system lacking CYP28

    • Use pre-adsorption with related proteins to remove cross-reactive antibodies

  • Alternative detection methods:

    • Switch from chemiluminescence to fluorescent secondary antibodies

    • Consider more sensitive detection systems for lower primary antibody concentrations

These approaches parallel methods used to optimize specificity with other CYP antibodies in research settings as described in the literature .

How can CYP28 antibodies be utilized to study protein-protein interactions in photosynthetic complexes?

CYP28 antibodies can be powerful tools for investigating protein-protein interactions within photosynthetic complexes through several methodological approaches:

  • Co-immunoprecipitation (Co-IP):

    • Use CYP28 antibodies conjugated to agarose or magnetic beads

    • Gently lyse plant cells under non-denaturing conditions to preserve protein complexes

    • Precipitate CYP28 along with interacting partners

    • Identify co-precipitated proteins by mass spectrometry or Western blotting

  • Proximity ligation assay (PLA):

    • Utilize CYP28 antibody in combination with antibodies against suspected interaction partners

    • This technique allows visualization of protein interactions in situ with high specificity

    • Positive signals indicate proteins are within 40 nm of each other

  • Bimolecular fluorescence complementation (BiFC):

    • While not directly using antibodies, findings from antibody-based studies can inform BiFC construct design

    • Verify interactions identified by antibody methods using this complementary approach

  • Immunogold electron microscopy:

    • Use CYP28 antibodies conjugated to gold particles

    • Visualize the precise localization of CYP28 within photosystem II complexes at nanometer resolution

  • Crosslinking mass spectrometry:

    • Chemically crosslink protein complexes before immunoprecipitation with CYP28 antibodies

    • Identify crosslinked peptides by mass spectrometry to map interaction interfaces

These approaches build upon methodologies used to study protein-protein interactions in other complex enzyme systems, such as those described for cytochrome P450 enzymes in cardiovascular tissues .

What experimental approaches can reliably measure CYP28 enzyme activity in conjunction with antibody-based detection?

Measuring CYP28 enzyme activity (PPIase activity) while correlating with antibody-based detection requires integrated experimental approaches:

  • Peptidyl-prolyl isomerase activity assay:

    • Use synthetic peptide substrates containing proline residues

    • Monitor conformational changes by fluorescence or absorbance

    • Correlate activity with CYP28 protein levels detected by immunological methods

    • Specifically examine how mutations in K113 and E187 affect activity

  • Coupled enzyme activity measurements:

    • Since CYP28 is involved in photosystem II assembly , measure photosystem II activity (oxygen evolution)

    • Correlate with CYP28 protein levels detected by antibody-based methods

    • Use inhibitors specific to PPIase activity to confirm relationship

  • In-gel activity assays:

    • Separate native protein complexes by non-denaturing gel electrophoresis

    • Perform activity assays directly in the gel

    • Transfer to membrane for Western blotting with CYP28 antibody

    • Align activity bands with immunoreactive bands

  • Enzyme kinetics determination:

    • Immunopurify CYP28 using specific antibodies

    • Measure enzyme kinetics parameters (Km, Vmax)

    • Compare across different experimental conditions or genetic backgrounds

These approaches integrate functional enzyme assays with immunological detection methods to provide a comprehensive analysis of CYP28 function, similar to approaches used with other enzyme systems .

How does CYP28 expression and activity compare across different plant species and tissue types?

While specific comparative data across different plant species is not provided in the search results, we can outline the methodological approach researchers should use to investigate CYP28 expression and activity patterns:

  • Cross-species expression analysis:

    • Extract total protein from comparable tissues across different plant species

    • Perform Western blot analysis using CYP28 antibody that recognizes conserved epitopes

    • Normalize loading with reference proteins like actin or tubulin

    • Present data as relative expression ratios across species

  • Tissue-specific expression profiling:

    • Sample different tissue types (leaves, stems, roots, reproductive structures)

    • Quantify CYP28 protein levels by Western blot or ELISA using specific antibodies

    • Correlate with tissue-specific PPIase activity measurements

    • Present as a comprehensive tissue expression matrix with both protein levels and activity data

  • Developmental expression analysis:

    • Sample tissues at different developmental stages

    • Monitor changes in CYP28 protein expression

    • Correlate with photosystem II assembly and function

    • Present time-course data showing relationships between development and CYP28 levels

  • Stress response evaluation:

    • Subject plants to various stresses (light, temperature, drought)

    • Monitor changes in CYP28 expression and activity

    • Correlate with photosynthetic efficiency metrics

    • Present comparative stress response data across species

This analytical approach follows methodologies established for studying expression patterns of other enzymes across different tissues, such as those used to characterize CYP2C8, CYP2C9 and CYP2J2 distribution in cardiovascular tissues .

How can researchers develop improved CYP28 antibodies with enhanced specificity and sensitivity?

Developing next-generation CYP28 antibodies with improved performance characteristics requires strategic approaches:

  • Epitope selection optimization:

    • Perform detailed sequence alignment of CYP28 across species to identify:

      • Highly conserved regions (for broad cross-species reactivity)

      • Unique regions (for specificity against other cyclophilins)

    • Target regions containing functional residues K113 and E187

    • Avoid hydrophobic regions that may cause non-specific binding

  • Multiple antibody development strategies:

    • Generate antibodies against different epitopes:

      • N-terminal region antibodies

      • C-terminal region antibodies

      • Internal domain-specific antibodies

    • Develop both polyclonal and monoclonal antibodies for different applications

  • Validation methodology matrix:

    • Implement comprehensive validation across multiple techniques:

      • Western blotting

      • Immunoprecipitation

      • Immunohistochemistry

      • ELISA

    • Validate in multiple plant species

    • Test against knockout/knockdown samples as negative controls

  • Antibody engineering approaches:

    • Fragment antibodies (Fab, scFv) for better tissue penetration

    • Recombinant antibody production for batch-to-batch consistency

    • Affinity maturation to enhance sensitivity

These approaches parallel methodologies used to develop highly specific antibodies for other closely related protein families, such as those described for distinguishing between CYP2C8 and CYP2C9 .

What are the considerations for conducting comparative studies of CYP28 and related enzymes across evolutionary lineages?

When designing comparative studies of CYP28 across evolutionary lineages, researchers should consider these methodological aspects:

  • Phylogenetic analysis framework:

    • Construct comprehensive phylogenetic trees of cyclophilin family proteins

    • Map functional residues (K113, E187) across evolutionary history

    • Correlate structural conservation with functional conservation

    • Present data as evolutionary distance plots with functional annotations

  • Structural homology modeling:

    • Generate structural models based on crystallized cyclophilins

    • Compare active site architecture across species

    • Identify conserved interaction surfaces for photosystem II components

    • Present structural overlays highlighting conserved vs. divergent regions

  • Functional conservation testing:

    • Use recombinant protein expression systems

    • Conduct complementation studies across species

    • Measure PPIase activity with standardized substrates

    • Present comparative enzymatic parameters (kcat, Km) across species

  • Antibody cross-reactivity mapping:

    • Test CYP28 antibodies against orthologous proteins from different species

    • Determine epitope conservation boundaries

    • Optimize pan-specific vs. species-specific antibodies

    • Present hierarchical clustering of immunological cross-reactivity

This approach integrates evolutionary analysis with functional biochemistry, similar to studies examining the relative expression of cytochrome P450 enzymes across different tissues and species .

How might advanced imaging techniques enhance our understanding of CYP28 localization and dynamics?

Advanced imaging methodologies offer significant potential for elucidating CYP28 localization and dynamics in photosynthetic systems:

  • Super-resolution microscopy applications:

    • Implement STORM or PALM imaging with CYP28 antibodies

    • Achieve 10-20 nm resolution of CYP28 localization within thylakoid membranes

    • Dual-label with photosystem II components to map spatial relationships

    • Present high-resolution localization maps showing CYP28 distribution patterns

  • Live-cell imaging strategies:

    • Combine antibody fragment labeling with fluorescent proteins

    • Track dynamic assembly processes in real-time

    • Measure protein mobility using fluorescence recovery after photobleaching (FRAP)

    • Present time-resolved visualizations of assembly dynamics

  • Correlative light and electron microscopy (CLEM):

    • Localize CYP28 by fluorescence microscopy

    • Correlate with ultrastructural features using electron microscopy

    • Generate 3D reconstructions of CYP28 distribution relative to thylakoid architecture

    • Present multi-scale imaging data from molecular to organelle levels

  • Single-molecule tracking:

    • Label CYP28 with quantum dots or other bright fluorophores

    • Track individual molecules during photosystem assembly

    • Calculate diffusion coefficients and binding kinetics

    • Present single-molecule trajectories and statistical analyses

These approaches extend beyond traditional immunolocalization methods to provide dynamic, high-resolution insights into CYP28 function in photosynthetic membrane organization.

What are the most promising directions for utilizing CYP28 antibodies in studying photosynthetic efficiency and stress responses?

CYP28 antibodies offer valuable research tools for investigating photosynthetic efficiency and stress responses through several promising research directions:

  • Stress adaptation mechanisms:

    • Monitor CYP28 protein levels during:

      • High light stress

      • Temperature extremes

      • Drought conditions

      • Nutrient limitation

    • Correlate CYP28 abundance with photosynthetic complex stability

    • Evaluate the protective role of PPIase activity during stress

    • Present integrated datasets connecting CYP28 levels, PPIase activity, and photosynthetic parameters

  • Genetic engineering applications:

    • Use antibodies to validate CYP28 overexpression or modified variants

    • Assess impacts on photosystem II assembly efficiency

    • Evaluate potential for enhancing crop photosynthetic performance

    • Present comparative analysis between wild-type and engineered plants

  • Climate change adaptation research:

    • Study CYP28 expression patterns in plants from extreme environments

    • Identify natural variants with enhanced stability or activity

    • Evaluate potential for engineering climate-resilient crops

    • Present ecophysiological correlations between environmental conditions and CYP28 expression

  • Systems biology integration:

    • Incorporate CYP28 antibody-derived data into mathematical models

    • Predict system-level responses to environmental perturbations

    • Identify leverage points for photosynthetic optimization

    • Present network analyses showing CYP28's position in photosynthetic regulatory networks

These research directions build upon the established role of CYP28 in photosystem II and LHC II supercomplex assembly , extending to applications in agricultural and environmental research.

What is the recommended protocol for immunoprecipitation of CYP28 protein complexes?

The following protocol is recommended for immunoprecipitation of CYP28 protein complexes from plant tissues:

Reagents and Materials:

  • Anti-CYP28 antibody

  • Protein A/G magnetic beads

  • Extraction buffer: 50 mM Tris-HCl pH 7.5, 150 mM NaCl, 1% NP-40, 0.5% sodium deoxycholate, protease inhibitor cocktail

  • Wash buffer: 50 mM Tris-HCl pH 7.5, 150 mM NaCl, 0.1% NP-40

  • Elution buffer: 0.1 M glycine pH 2.5

Procedure:

  • Sample preparation:

    • Homogenize 1 g fresh plant tissue in 3 ml ice-cold extraction buffer

    • Centrifuge at 14,000 × g for 15 minutes at 4°C

    • Transfer supernatant to new tube and measure protein concentration

  • Pre-clearing:

    • Add 50 μl Protein A/G beads to 1 mg protein extract

    • Incubate with gentle rotation for 1 hour at 4°C

    • Remove beads by magnetic separation

  • Antibody binding:

    • Add 5 μg anti-CYP28 antibody to pre-cleared lysate

    • Incubate overnight with gentle rotation at 4°C

    • Add 50 μl fresh Protein A/G beads

    • Incubate for 3 hours at 4°C

  • Washing:

    • Collect beads using magnetic stand

    • Wash 5 times with 1 ml wash buffer

    • Perform final wash with PBS to remove detergent

  • Elution:

    • Add 50 μl elution buffer to beads

    • Incubate for 5 minutes at room temperature

    • Collect eluate and neutralize with 5 μl 1M Tris-HCl pH 8.0

    • For complex analysis, elute by adding SDS sample buffer and heating at 95°C for 5 minutes

  • Analysis:

    • Analyze eluted proteins by SDS-PAGE and Western blotting

    • For interactome studies, submit samples for mass spectrometry analysis

This protocol integrates principles used for immunoprecipitation of other CYP family proteins , adapted for plant tissue samples and CYP28 analysis.

What quality control metrics should be applied to evaluate CYP28 antibody performance?

To ensure consistent and reliable results with CYP28 antibodies, researchers should implement these quality control metrics:

Antibody Validation Metrics:

Quality Control ParameterAcceptance CriteriaMethodology
SpecificitySingle band at expected MW in Western blotWestern blot against recombinant CYP28 and plant extract
SensitivityDetection limit ≤ 10 ng proteinSerial dilution of recombinant protein
Lot-to-lot consistency< 20% variation in signal intensityWestern blot comparison between antibody lots
Cross-reactivity< 10% signal with related proteinsTesting against recombinant related cyclophilins
Background signalSignal:noise ratio > 10:1Western blot of negative control samples
ReproducibilityCV < 15% between technical replicatesRepeated Western blots of identical samples

Application-Specific Quality Controls:

  • For Western blotting:

    • Include positive control (recombinant CYP28) on each blot

    • Include negative control (non-plant extract) on each blot

    • Verify expected molecular weight with precision standards

  • For immunoprecipitation:

    • Perform IgG control precipitation in parallel

    • Verify enrichment by comparing input vs. IP by Western blot

    • Calculate enrichment factor (IP signal/input signal ratio)

  • For immunohistochemistry:

    • Include secondary-only control

    • Perform peptide competition control

    • Validate specificity with tissue known to lack CYP28

These quality control metrics ensure robust and reproducible results when working with CYP28 antibodies in various experimental contexts, similar to validation approaches used for other antibodies in research settings .

How can researchers effectively use CYP28 antibodies in multi-species comparative studies?

For effective use of CYP28 antibodies in multi-species comparative studies, researchers should implement this methodological framework:

  • Epitope conservation analysis:

    • Perform sequence alignment of CYP28 across target species

    • Identify percent identity in antibody epitope region

    • Predict cross-reactivity based on epitope conservation

    • Consider developing consensus peptide antibodies for broad species coverage

  • Validation across species:

    • Test antibody against recombinant CYP28 from multiple species

    • Validate on tissue samples from each target species

    • Determine optimal working dilutions for each species

    • Document cross-reactivity patterns in a species compatibility matrix

  • Standardization strategies:

    • Normalize loading using highly conserved housekeeping proteins

    • Include recombinant CYP28 standard curve on each blot

    • Process all species samples simultaneously with identical protocols

    • Use automated analysis software to quantify signals objectively

  • Data normalization approaches:

    • Calculate relative expression ratios rather than absolute values

    • Normalize to total protein content (validated by stain-free gels)

    • Use multiple reference proteins for normalization

    • Present data with appropriate statistical analysis of species differences

  • Technical considerations:

    • Optimize extraction buffers for each species' tissue composition

    • Adjust antibody concentrations based on expected protein abundance

    • Consider evolutionary distance when interpreting signal differences

    • Document all species-specific protocol modifications

This comprehensive approach enables reliable cross-species comparisons using CYP28 antibodies, similar to comparative methodologies used for studying cytochrome P450 enzymes across different tissue types .

What are the key considerations for designing robust experiments using CYP28 antibodies?

Designing robust experiments with CYP28 antibodies requires careful attention to several critical factors that impact experimental validity and reproducibility:

These integrated considerations ensure that experiments using CYP28 antibodies produce reliable, reproducible results that advance our understanding of photosystem assembly and function.

How might emerging technologies enhance the utility of CYP28 antibodies in plant biology research?

Emerging technologies offer significant potential to expand the utility and impact of CYP28 antibody-based research in plant biology:

  • Single-cell proteomics combined with CYP28 antibodies could reveal cell-type specific expression patterns within heterogeneous plant tissues, providing unprecedented resolution of CYP28 distribution in relation to cellular specialization and photosynthetic capacity. This approach would enable mapping of CYP28 expression across different cell types within the same leaf.

  • Microfluidic immunoassays may dramatically reduce the sample size requirements for CYP28 detection, enabling analysis from limited material such as single leaves or specific tissue regions. This would facilitate high-throughput screening of multiple genetic variants or environmental conditions with minimal sample consumption.

  • Nanobody development against CYP28 could overcome limitations of conventional antibodies, offering smaller probes with superior tissue penetration for in vivo imaging and potentially enabling live-cell visualization of CYP28 dynamics during photosystem assembly processes .

  • CRISPR-based tagging of endogenous CYP28 combined with antibody detection could provide correlative data on both localization and function, enabling researchers to connect molecular mechanisms to physiological outcomes in unmodified plants.

  • Machine learning analysis of immunolocalization data could identify subtle patterns in CYP28 distribution that correlate with photosynthetic efficiency metrics, potentially revealing previously unrecognized functional relationships.

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