UGT73B4 Antibody
Description
Introduction to UGT73B4 Antibody
The UGT73B4 Antibody is a specialized immunological reagent designed to detect and study the UDP-glycosyltransferase 73B4 (UGT73B4) protein in Arabidopsis thaliana. UGT73B4 belongs to the plant UDP-glycosyltransferase family, which catalyzes the transfer of sugar moieties to small molecules, influencing their stability, solubility, and bioactivity . This antibody is critical for functional studies of UGT73B4’s role in plant secondary metabolism and stress responses .
Functional Characterization of UGT73B4
UGT73B4 is a multifunctional enzyme with demonstrated roles in:
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Xenobiotic Detoxification: Conjugates glucose to toxic compounds like 2,4,6-trinitrotoluene (TNT), enhancing their detoxification .
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Flavonoid Metabolism: Exhibits quercetin 3-O-glucosyltransferase activity, contributing to flavonoid biosynthesis .
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Stress Response: Upregulated during pathogen infection and chemical stress, acting as a core component of the Arabidopsis UGT stress-inducible network .
Key Residues and Catalytic Activity
Molecular studies highlight residues H373, W376, and E397 as critical for UGT73B4’s catalytic activity, with F151 influencing substrate specificity .
4.1. Role in Pathogen Defense
UGT73B4 expression is induced during the hypersensitive response (HR) to Pseudomonas syringae infection, peaking at 5 hours post-inoculation. Its expression levels are lower than its homolog UGT73B5 but show similar temporal dynamics .
4.2. Chemical Stress Adaptation
UGT73B4 is upregulated by xenobiotics such as benzoxazolin-2(3H)-one, with knockouts showing reduced resistance to chemical stressors .
4.3. Protein Interactions
STRING database analysis identifies CYP71B19 (a cytochrome P450) and MSJ1.9 (a nitropropane dioxygenase-like protein) as functional partners, suggesting roles in integrated detoxification pathways .
Applications in Plant Biology
The UGT73B4 Antibody enables:
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Protein Localization Studies: Tracking UGT73B4 expression in plant tissues under stress conditions.
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Functional Genomics: Validating CRISPR/Cas9 knockouts or overexpression lines .
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Mechanistic Studies: Investigating substrate specificity and catalytic mutants .
Comparative Analysis with Related UGTs
| Feature | UGT73B4 | UGT73B5 | UGT73B3 |
|---|---|---|---|
| Substrate Preference | Xenobiotics | Flavonoids | Benzoates |
| Stress Induction | Moderate | High | Low |
| Catalytic Efficiency | 0.66 s⁻¹ (TNT) | 1.88 s⁻¹ (quercetin) | 0.63 s⁻¹ (DCA) |
Data derived from kinetic studies of recombinant GST-UGT fusion proteins .
Product Specs
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Target Background
Q&A
Basic Research Questions
How do I validate UGT73B4 antibody specificity for plant enzyme studies?
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Perform Western blotting using Arabidopsis thaliana wild-type and ugt73b4 knockout mutants .
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Combine with enzymatic assays testing glucosyltransferase activity toward quercetin or 2,4,6-trinitrotoluene (TNT) .
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Validate subcellular localization via confocal microscopy with GFP-tagged UGT73B4 constructs .
Which model systems are optimal for UGT73B4 functional characterization?
What are common experimental pitfalls in detecting UGT73B4-mediated glycosylation?
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Substrate competition: Test multiple substrates (e.g., flavonoids vs. xenobiotics) at physiological concentrations .
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pH sensitivity: Optimize reaction buffers between pH 6.0–7.5 .
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Co-factor requirements: Include UDP-glucose at ≥1 mM in assays .
Advanced Research Challenges
How to resolve contradictory data on UGT73B4 substrate specificity?
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Conduct kinetic analyses with purified enzyme:
Compare catalytic efficiency () for flavonoids vs. benzoates . -
Use structural modeling to map substrate-binding pockets (e.g., AlphaFold predictions) .
What methods distinguish UGT73B4’s role in defense vs. detoxification pathways?
How to address antibody cross-reactivity with paralogs like UGT73B3/73B5?
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Develop isoform-specific peptides for competitive ELISA (e.g., residues 210–225 of UGT73B4) .
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Combine CRISPR-Cas9 editing (create epitope tags) with immunoprecipitation-MS validation .
Methodological Considerations
What orthogonal techniques complement UGT73B4 antibody-based assays?
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Enzyme-linked immunosorbent assay (ELISA): Quantify protein levels under stress conditions .
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Activity-based protein profiling (ABPP): Use UDP-glucose probes with click chemistry .
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Phylogenetic footprinting: Compare UGT73B4 epitope conservation across Brassicaceae .
How to optimize immunohistochemistry for UGT73B4 in plant tissues?
| Parameter | Recommendation |
|---|---|
| Fixation | 4% formaldehyde + 0.1% Triton X-100 |
| Antigen retrieval | Citrate buffer (pH 6.0), 95°C, 20 min |
| Blocking | 5% BSA + 2% goat serum, 2 hr |
Strategies for correlating UGT73B4 expression with metabolic phenotypes
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Perform targeted metabolomics on:
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Apply multivariate PLS regression to link protein abundance with metabolite levels .
