XERO2 Antibody
Description
XERO2 Antibody: Definition and Biological Context
XERO2 antibodies target dehydrin XERO2, a stress-responsive protein predominantly studied in plants like Arabidopsis thaliana. Dehydrins, including XERO2, are upregulated during drought, cold, and salinity stresses, where they stabilize cellular structures and prevent protein aggregation . XERO2 antibodies enable researchers to visualize, quantify, and study the spatial-temporal expression of this protein under stress conditions .
Structure and Functional Insights
XERO2 antibodies are typically monoclonal or polyclonal IgG molecules engineered to recognize conserved regions of the XERO2 protein. Key structural and functional attributes include:
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Epitope Specificity: XERO2 antibodies often target conserved motifs such as the K-segment (lysine-rich regions) and Y-segment (nucleotide-binding domains), which are critical for XERO2’s chaperone activity .
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Binding Mechanism: These antibodies utilize variable heavy (VH) and light (VL) chain domains to form antigen-binding sites, ensuring high specificity for XERO2’s disordered regions .
Table 1: Key Functional Domains of XERO2 Recognized by Antibodies
| Domain | Function | Antibody Binding Region | Source |
|---|---|---|---|
| K-segment | Membrane stabilization | C-terminal region | |
| Y-segment | Nucleic acid interaction | N-terminal region | |
| S-segment | Phosphorylation site | Central disordered loop |
Role in Stress Adaptation
XERO2 antibodies have been instrumental in demonstrating the protein’s accumulation under cold stress. For example, in Fragaria vesca (wild strawberry), XERO2 transcript levels increased 15-fold after 42 days of low-temperature exposure, correlating with enhanced frost tolerance .
Table 2: XERO2 Transcript Accumulation Under Cold Stress
| Tissue | 24 h (LT) | 7 d (LT) | 14 d (LT) | 42 d (LT) |
|---|---|---|---|---|
| Crown | 1.2x | 4.5x | 8.7x | 15.0x |
| Leaf | 1.0x | 3.8x | 7.2x | 12.5x |
Data normalized to non-stressed controls; LT = low temperature .
Chaperone Activity
Studies using ERD14 (a XERO2 homolog) deletion mutants revealed that antibodies targeting conserved regions abolished the protein’s protective effect under heat stress, reducing cell viability from 74.5% to 38.9% . This underscores XERO2’s role in preventing protein denaturation.
Cross-Reactivity and Limitations
While XERO2 antibodies exhibit high specificity, cross-reactivity with other dehydrins (e.g., COR47) has been observed due to conserved motifs . Researchers must validate assays using knockout controls to mitigate false positives.
Future Directions
Emerging applications include engineering XERO2 antibodies for crop resilience studies and synthetic biology. For instance, overexpression of XERO2 in transgenic plants could be tracked using these antibodies to optimize stress tolerance pathways .
Product Specs
Composition: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Q&A
Basic Research Questions
How to validate XERO2 antibody specificity for plant stress response studies?
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Methodological approach: Perform Western blot with cold-treated Fragaria vesca tissue extracts alongside recombinant XERO2 protein controls. Include knockout/knockdown genotypes (e.g., cold-sensitive cultivars like ‘NCGR1363’) as negative controls .
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Key validation data:
What tissue types show optimal XERO2 antibody reactivity in dehydration studies?
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Prioritize crown tissues in cold-acclimated strawberries (F. vesca), where XERO2 protein levels peak at 42 days of low-temperature (LT) exposure . In anthers, constitutive XERO2 expression occurs even under non-stress conditions, making floral tissues suitable for baseline studies .
How do experimental timelines affect XERO2 detection in cold stress assays?
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Transcript accumulation precedes protein changes by 24–48 hours in most genotypes. For protein-level analyses, sample at ≥7 days post-LT exposure. Exception: In ‘ALTA’ crowns, COR47 protein accumulation precedes transcript increases, suggesting post-transcriptional regulation .
Advanced Research Questions
How to resolve discrepancies between XERO2 transcript and protein quantification data?
What explains cross-reactivity between XERO2 and COR47 antibodies?
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Structural analysis reveals dehydrins share conserved K-segments. Mitigation strategies:
How to design a genotype-comparative study using XERO2 antibodies?
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Critical finding: ‘ALTA’ shows 10-fold higher XERO2 transcripts under non-acclimated conditions vs. ‘NCGR1363’ .
Can XERO2 antibodies detect stress-independent expression patterns?
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Yes. In tapetal cells, XERO2 is constitutively expressed, as shown by:
