PRXIIB Antibody
Description
PRXIIB Antibody Characteristics
PRXIIB antibodies are typically polyclonal or monoclonal reagents raised against recombinant PRXIIB protein or synthetic peptides corresponding to conserved regions of the enzyme. Key features include:
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Host Species: Commonly produced in rabbits or goats due to their robust immune response to plant antigens .
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Specificity: Targets epitopes within PRXIIB, such as the redox-sensitive Cys51 residue critical for H₂O₂ sensing .
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Applications: Western blot (WB), immunoprecipitation (IP), immunofluorescence (IF), and immunohistochemistry (IHC) .
PRXIIB as an H₂O₂ Sensor in Plant Immunity
PRXIIB antibodies were instrumental in identifying PRXIIB’s role in stomatal immunity. Key discoveries include:
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Oxidation at Cys51: PRXIIB senses endogenous H₂O₂ during pathogen attack, undergoing oxidation at Cys51 .
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Interaction with ABI2: Oxidized PRXIIB conjugates with the protein phosphatase ABI2, inhibiting its activity and amplifying immune signaling .
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Genetic Evidence: PRXIIB-knockout plants exhibit compromised stomatal closure, increasing susceptibility to Pseudomonas syringae .
Table 2: Key PRXIIB-Mediated Immune Signaling Events
| Process | Mechanism | Outcome |
|---|---|---|
| H₂O₂ Sensing | Cys51 oxidation triggers conformational change | Activates redox signaling cascade |
| ABI2 Inhibition | PRXIIB-ABI2 conjugation reduces phosphatase activity | Enhances defense gene expression |
| Pathogen Resistance | PRXIIB-dependent stomatal closure | Blocks bacterial entry |
Technical Validation of PRXIIB Antibodies
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Western Blot: Detects PRXIIB at ~22–28 kDa in plant lysates, with specificity confirmed using knockout controls .
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Immunoprecipitation: Validates PRXIIB-ABI2 interactions under oxidative stress .
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Localization Studies: Immunofluorescence confirms PRXIIB’s cytosolic and nuclear localization in plant cells .
Figure 1: Example Western Blot Data
Comparative Analysis of Peroxiredoxin Antibodies
PRXIIB antibodies share similarities with other peroxiredoxin-targeting reagents but differ in specificity:
| Feature | PRXIIB Antibody | PRX1/PRX3 Antibodies |
|---|---|---|
| Target Localization | Cytosol, nucleus | Mitochondria, chloroplasts |
| Key Residue | Cys51 | Cys47 (PRX1), Cys72 (PRX3) |
| Function Focus | Immune signaling | Antioxidant defense |
| Cross-Reactivity | Plant-specific | Broad (human, mouse, rat) |
Future Directions
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Dynamic Redox States: Develop phospho-specific antibodies to track PRXIIB hyperoxidation (e.g., Cys51-SO₃H) .
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Structural Studies: Use antibodies for cryo-EM or X-ray crystallography to resolve PRXIIB-ABI2 complexes .
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Agricultural Applications: Engineer PRXIIB-overexpressing crops for enhanced disease resistance.
Product Specs
**Constituents:** 50% Glycerol, 0.01M PBS, pH 7.4
