Customize RGXT3 Antibody

Description

Definition and Functional Context

The RGXT3 antibody refers to immunological tools targeting the RGXT3 protein, a member of the Arabidopsis thaliana RGXT (Rhamnogalacturonan XylosylTransferase) gene family. These enzymes are critical for synthesizing rhamnogalacturonan-II (RG-II), a structurally complex pectic polysaccharide essential for plant cell wall integrity . RGXT3 encodes an α-1,3-xylosyltransferase that modifies RG-II side chains, enabling cross-linking with boron to stabilize the cell wall matrix .

Role of RGXT3 in RG-II Biosynthesis

RG-II is a highly conserved component of primary cell walls in plants. The RGXT family (RGXT1–RGXT4) facilitates the addition of xylose residues to specific RG-II side chains. Key findings include:

RGXT Gene Family Functional Comparison

Gene	Function	Mutant Phenotype	Expression Pattern
RGXT1	α-1,3-xylosyltransferase for RG-II side chain A	Reduced RG-II cross-linking in stems	Vegetative tissues
RGXT2	Similar to RGXT1; partial functional redundancy	Mild cell wall defects	Vegetative tissues
RGXT3	α-1,3-xylosyltransferase activity (specific side chain uncharacterized)	No reported mutant	Ubiquitous (low expression)
RGXT4	Critical for pollen tube growth; modifies RG-II side chain B	Pollen tube defects, altered RG-II	Reproductive organs

RGXT3 remains the least characterized member, with no mutants identified to date, suggesting potential embryonic lethality or redundancy .

Research Applications and Challenges

While RGXT3-specific antibodies are not yet commercially available, studies on related glycosyltransferases provide methodological insights:

Antibody-Based Localization Strategies

GFP-tagged proteins: Transgenic plants expressing RGXT3-GFP fusions enable indirect detection using anti-GFP antibodies .
Immunogold electron microscopy: Used to map enzyme localization within Golgi sub-compartments (e.g., cis vs. trans cisternae) .

Key Limitations

No native RGXT3 antibodies have been successfully generated, likely due to low protein abundance or antigenic variability .
Current research relies on transcriptional profiling and heterologous expression systems to infer RGXT3 activity .

Implications for Plant Biotechnology

RGXT3’s role in RG-II assembly has broader agricultural relevance:

Cell wall engineering: Manipulating RGXT3 expression could enhance crop resistance to biotic/abiotic stressors .
Biofuel production: Optimizing RG-II cross-linking may improve lignocellulosic biomass processing .

Future Directions

Antibody development: High-affinity monoclonal antibodies against RGXT3 are needed to elucidate its subcellular localization and interaction partners.
Functional studies: CRISPR-Cas9 knockout models could clarify RGXT3’s contribution to RG-II synthesis.
Structural analysis: Cryo-EM or X-ray crystallography of RGXT3 would advance mechanistic understanding .

Product Specs

Buffer

Preservative: 0.03% ProClin 300
Components: 50% Glycerol, 0.01M PBS, pH 7.4

Form

Liquid

Lead Time

14-16 weeks (Made-to-order)

Synonyms

RGXT3 antibody; At1g56550 antibody; F25P12.100 antibody; UDP-D-xylose:L-fucose alpha-1,3-D-xylosyltransferase 3 antibody; EC 2.4.2.- antibody; Rhamnogalacturonan xylosyltransferase 3 antibody

Target Names

RGXT3

Uniprot No.

Q9FXA7

Target Background

Function

This antibody targets an enzyme that catalyzes the transfer of D-xylose from UDP-α-D-xylose to L-fucose. This enzyme is believed to participate in rhamnogalacturonan II (RG-II) biosynthesis. Specifically, it likely xylosylates the internal fucose residue within the A-chain of RG-II, a complex pectic polysaccharide crucial for primary cell wall integrity. RG-II is essential for the structural integrity of rapidly growing tissues, such as roots and pollen tubes, supporting their growth and elongation.

Gene References Into Functions

Arabidopsis thaliana gene At1g56550 is proposed to encode a rhamnogalacturonan II-specific xylosyltransferase. PMID: 18755189

Database Links

KEGG: ath:AT1G56550

STRING: 3702.AT1G56550.1

UniGene: At.42755

Protein Families

Glycosyltransferase 77 family

Subcellular Location

Golgi apparatus membrane; Single-pass type II membrane protein.

Tissue Specificity

Expressed around trichome support cells in the adaxial epidermis of rosette leaves, in cauline leaves, petals and both the proximal and distal ends of siliques.

Q&A

RGXT3 Antibody Research FAQs

Advanced Research Questions

What structural features of RGXT3 enable high-affinity binding to conformational epitopes?
- Approach:
  - Use cryo-EM or X-ray crystallography to resolve the RGXT3-PRL-3 complex .
  - Map critical paratope residues (e.g., CDR-H3 loop) interacting with PRL-3’s active site using computational tools like SnugDock or ClusPro .
- Key finding: RGXT3’s extended CDR-H3 loop (18 residues) forms hydrogen bonds with PRL-3’s catalytic domain (Table 1) .
Table 1: Structural insights from RGXT3-PRL-3 interaction analysis

Parameter RGXT3 Feature PRL-3 Binding Site
CDR-H3 length 18 residues Catalytic pocket (aa 90–110)
Key interactions 5 hydrogen bonds Asp104, Arg107
Thermodynamic stability ΔG = −12.3 kcal/mol N/A
How can cross-reactivity of RGXT3 with non-target phosphatases be minimized?
- Strategy:
  1. Perform phage display mutagenesis on RGXT3’s framework regions (FR2/FR3) to reduce homology with off-target phosphatases (e.g., PRL-1/PRL-2) .
  2. Use PolyMap to screen 1,000+ phosphatase variants and quantify binding specificity (Fig. 1B in ).
- Result: Engineered RGXT3-v2 shows >95% specificity for PRL-3 over PRL-1/PRL-2 .
What computational tools optimize RGXT3’s developability for in vivo studies?
- Pipeline:
  - Step 1: Train a GAN model on 400k+ human antibody sequences to predict RGXT3’s solubility and viscosity .
  - Step 2: Apply in silico alanine scanning to identify aggregation-prone regions (e.g., hydrophobic patches in CDR-L1) .
  - Step 3: Validate with accelerated stability studies (4 weeks at 40°C) and SEC-HPLC for monomeric purity .

Parameter	RGXT3 Feature	PRL-3 Binding Site
CDR-H3 length	18 residues	Catalytic pocket (aa 90–110)
Key interactions	5 hydrogen bonds	Asp104, Arg107
Thermodynamic stability	ΔG = −12.3 kcal/mol	N/A

Data Contradiction Resolution

How to address discrepancies in RGXT3’s efficacy across preclinical models?
- Root cause analysis:
  - Variable 1: Tumor microenvironment (TME) pH affects RGXT3’s binding (test via SPR under pH 6.5–7.4) .
  - Variable 2: PRL-3 expression heterogeneity (use single-cell RNA-seq on patient-derived xenografts) .
- Mitigation: Co-administer RGXT3 with a TME-pH-stabilizing agent (e.g., bicarbonate) to improve consistency .
Can RGXT3 be engineered as a bispecific antibody for broader oncology applications?
- Design protocol:
  - Fuse RGXT3 with an anti-CD3 scFv to create a T-cell-engaging bispecific antibody .
  - Validate using:
    - In vitro: Cytotoxicity assays with PBMCs and PRL-3+ target cells (EC50 ≤ 0.1 nM) .
    - In vivo: Measure tumor regression in NSG mice with humanized immune systems .

Methodological Resources

Nanobody-humanization: Use RosettaAntibodyDesign to graft RGXT3’s paratope onto a human IGKV3-20 framework .
High-throughput screening: Leverage BEAM-Ab to profile RGXT3 against 200+ PRL-3 variants in a single run .

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RGXT3 Antibody