At5g64030 Antibody
Description
Target Protein: At5g64030
The At5g64030 gene encodes a dehydration-responsive protein involved in plant stress adaptation. Functional studies in Arabidopsis and related species (e.g., tomato homolog Solyc05g056580.2.1) indicate its role in drought response pathways . Key features include:
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Molecular Function: Associated with cellular responses to water deprivation and osmotic stress.
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Expression Profile: Upregulated under dehydration conditions (p-value: 0.0038) .
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Conservation: Shares homology with stress-related proteins across plant species .
Antibody Development and Validation
The At5g64030 antibody is typically produced using recombinant protein fragments or peptide antigens derived from the target sequence. Validation methods include:
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Western Blot: Confirms specificity by detecting the ~25–30 kDa band corresponding to the native protein .
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Immunofluorescence: Localizes the protein to cytoplasmic and nuclear compartments under stress conditions .
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Knockdown Controls: Reduced signal in Arabidopsis mutants lacking At5g64030 .
Table 1: Key Validation Parameters
| Application | Result | Source |
|---|---|---|
| Western Blot | Single band at expected molecular weight | |
| Immunoprecipitation | Enrichment of dehydration-related proteins | |
| Specificity | No cross-reactivity with homologs |
Research Applications
The antibody enables critical insights into:
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Stress Signaling Pathways: Identifies protein expression changes during drought, salinity, or cold stress .
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Protein-Protein Interactions: Co-immunoprecipitation studies reveal interactions with chaperones like HSP70 and DnaK .
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Transgenic Plant Analysis: Tracks overexpression or knockout lines to assess phenotypic effects .
Data from Functional Studies
A comparative analysis of dehydration-responsive proteins in tomato (Solanum lycopersicum) highlights conserved roles:
Table 2: Stress-Related Proteins in Tomato
| Protein ID | Functional Category | p-value | Homolog (Arabidopsis) |
|---|---|---|---|
| Solyc05g056580.2.1 | Abiotic stress | 0.0038 | At5g64030.1 |
| Solyc08g075870.2.1 | Abiotic stress | 0.0413 | At4g19120.1 (ERD3) |
| Solyc03g005600.2.1 | Abiotic stress | 0.0255 | At4g14360.1 |
Challenges and Considerations
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Specificity: Potential cross-reactivity with structurally similar proteins (e.g., ERD3) necessitates rigorous validation .
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Batch Variability: Antibody performance may differ between lots, requiring revalidation for each study .
Future Directions
Product Specs
Composition: 50% Glycerol, 0.01M PBS, pH 7.4
Target Background
Q&A
How is AT5G64030 antibody specificity validated in experimental workflows?
Validation typically involves multi-step biochemical assays:
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Surface Plasmon Resonance (SPR): Measures binding kinetics (e.g., association/dissociation rates) between the antibody and AT5G64030 protein. SPR success rates for designed antibodies in similar studies exceed 80% .
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Flow Cytometry: Confirms antibody binding to target-expressing cells (e.g., transfected HEK293 cells) with controls for non-specific binding .
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Immunoblotting: Detects target protein in plant tissue lysates, with molecular weight verification using SDS-PAGE .
Common pitfalls: Cross-reactivity with homologous methyltransferases (e.g., GT8 family members). Mitigate by pre-adsorbing antibodies against related protein extracts .
What experimental designs are optimal for AT5G64030 localization studies?
Methodological recommendations:
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Subcellular Fractionation: Combine differential centrifugation (e.g., step gradients) with free-flow electrophoresis (FFE) to enrich Golgi/TGN vesicles .
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Immunofluorescence: Use Arabidopsis root tip sections for high-resolution imaging, paired with organelle-specific markers (e.g., SYP61 for TGN) .
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Quantitative Proteomics: Apply LOPIT (Localization of Organelle Proteins by Isotope Tagging) to distinguish Golgi-resident proteins from contaminants .
Key data:
| Technique | Proteins Identified | AT5G64030 Detection |
|---|---|---|
| FFE | 371 | Yes |
| LOPIT | 204 | Yes |
| SYP61-CFP | 145 | No |
AT5G64030 is absent in SYP61-TGN isolates, suggesting Golgi stack specificity .
Advanced Research Questions
How can structural modeling resolve contradictory data on AT5G64030 antibody-antigen interactions?
Approach:
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Generate homology models of AT5G64030’s methyltransferase domain using AlphaFold2.
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Docking simulations: Predict antibody binding interfaces (e.g., CDR regions) with tools like HADDOCK.
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In vitro mutagenesis: Validate epitope residues by testing antibody binding to alanine-substituted mutants .
Case study: In IgG4/IgG1 subclass comparisons, IgG1 antibodies caused irreversible IgLON5 internalization, while IgG4 did not. Similar principles apply to AT5G64030 antibody isotype selection .
What strategies address functional redundancy in AT5G64030 knockout studies?
Experimental design:
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CRISPR-Cas9 multiplexing: Target AT5G64030 paralogs (e.g., GT8 family members) simultaneously.
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Phenotypic rescue assays: Express AT5G64030 under native/ectopic promoters in knockout lines.
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Multi-omics integration: Pair transcriptomics (RNA-seq) with metabolomics to identify compensatory pathways .
Critical data:
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AT5G64030 co-purifies with pectin methyltransferases (e.g., QUA2), suggesting functional clusters in cell wall biosynthesis .
How are antibody-antigen binding kinetics analyzed for AT5G64030 in planta?
Protocol:
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Biolayer Interferometry (BLI): Immobilize AT5G64030 on biosensors; measure real-time antibody binding in plant extracts.
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Competition assays: Pre-incubate antibodies with recombinant AT5G64030 to confirm binding specificity.
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SPR calibration: Compare plant-derived vs. HEK293-expressed AT5G64030 for glycosylation-dependent epitopes .
Key finding: Deglycosylation does not alter AT5G64030 antibody reactivity, unlike glycan-dependent neuronal antibodies .
Data Contradiction Analysis
Why might AT5G64030 antibodies fail to detect the protein in certain proteomic datasets?
Root causes:
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Methodological bias: Carbonate washing during FFE/LOPIT removes peripheral membrane proteins .
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Developmental stage: AT5G64030 is absent in 14-day-old plantlets but abundant in cell suspension cultures .
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Epitope masking: Post-translational modifications (e.g., phosphorylation) in specific tissues may occlude antibody binding.
Solution: Validate across multiple tissue types and extraction buffers (e.g., Triton X-100 vs. SDS).
