At2g31390 Antibody

What is At2g31390 and why is it important in plant research?

At2g31390 encodes a key enzyme involved in primary carbohydrate metabolism in Arabidopsis thaliana. This protein plays a critical role in plant energy systems and stress responses. Understanding its function contributes to our knowledge of how plants regulate carbon allocation under various environmental conditions. Antibodies against this protein enable researchers to track its expression, localization, and functional interactions, providing valuable insights into plant metabolic networks .

How are antibodies against plant proteins like At2g31390 typically produced?

Production of high-quality antibodies against plant proteins typically follows a standardized workflow:

• Antigen preparation: Express and purify either full-length At2g31390 or specific peptide epitopes using bacterial expression systems

• Immunization: Immunize mice or rabbits with the purified antigen following established protocols

• Hybridoma generation: For monoclonal antibodies, isolate B cells from immunized animals and fuse with myeloma cells to create hybridomas

• Screening: Identify hybridoma clones producing antibodies with high specificity using ELISA and other methods

• Purification: Harvest antibodies from culture supernatants using protein G affinity chromatography

• Quality control: Verify antibody purity via SDS-PAGE and specificity through multiple validation assays

This approach follows established standard operating procedures for generating research-grade antibodies against plant proteins.

What validation methods should I use to confirm specificity of an At2g31390 antibody?

A comprehensive validation strategy should include:

A validation approach incorporating multiple methods ensures confidence in antibody specificity before proceeding with experimental applications .

What are optimal conditions for using At2g31390 antibody in Western blot applications?

For Western blot detection of At2g31390:

• Sample preparation:

  • Grind plant tissue in liquid nitrogen and extract in buffer containing 50mM Tris-HCl pH 7.5, 150mM NaCl, 1% NP-40, 0.5% sodium deoxycholate, and protease inhibitors

  • Clear lysate by centrifugation (15,000g, 15 min, 4°C)

  • Quantify protein concentration using Bradford or BCA assay

• Electrophoresis and transfer:

  • Load 20-30μg total protein per lane

  • Separate on 10-12% SDS-PAGE gel

  • Transfer to PVDF membrane (wet transfer at 100V for 1 hour)

• Antibody incubation:

  • Block membrane with 5% non-fat milk in TBST for 1 hour at room temperature

  • Incubate with At2g31390 antibody (1:1000 dilution) overnight at 4°C

  • Wash 3 times with TBST

  • Incubate with HRP-conjugated secondary antibody (1:5000) for 1 hour

  • Develop using chemiluminescent substrate

• Controls and troubleshooting:

  • Include protein extract from At2g31390 knockout plants as negative control

  • Verify even loading using anti-actin or anti-GAPDH antibodies

  • If multiple bands appear, optimize antibody dilution or blocking conditions

How can I use At2g31390 antibody for protein localization studies in plant tissues?

For immunolocalization of At2g31390:

• Tissue preparation:

  • Fix Arabidopsis tissues in 4% paraformaldehyde in PBS for 2-4 hours

  • Wash thoroughly with PBS (3 times, 10 minutes each)

  • Embed in paraffin or LR White resin

  • Section to 5-10μm thickness

• Immunolabeling protocol:

  • Deparaffinize and rehydrate sections if using paraffin

  • Perform antigen retrieval by heating in 10mM sodium citrate buffer (pH 6.0)

  • Block with 3% BSA in PBS for 1 hour

  • Incubate with At2g31390 antibody (1:100-1:500) overnight at 4°C

  • Wash 3 times with PBS

  • Incubate with fluorophore-conjugated secondary antibody for 2 hours

  • Counterstain nuclei with DAPI

  • Mount in anti-fade medium and visualize by confocal microscopy

• Controls and quantification:

  • Include sections from knockout plants as negative controls

  • Perform technical replicates across multiple plants and developmental stages

  • Quantify signal intensity across subcellular compartments using image analysis software

What are the key considerations for immunoprecipitation experiments using At2g31390 antibody?

For successful immunoprecipitation of At2g31390:

• Buffer optimization:

  • Test different extraction buffers varying in salt concentration (150-500mM NaCl) and detergent types (NP-40, Triton X-100)

  • Include protease inhibitors, phosphatase inhibitors, and reducing agents

  • For weak interactions, consider mild detergents (0.1% NP-40) or chemical crosslinking

• Protocol parameters:

  • Use 2-5μg antibody per 1mg protein extract

  • Pre-clear lysate with protein G beads to reduce background

  • Incubate antibody with lysate overnight at 4°C

  • Add protein G beads for 2-3 hours

  • Wash extensively (4-5 times) with decreasing salt concentrations

  • Elute with SDS sample buffer or low pH glycine buffer

• Verification strategies:

  • Confirm pull-down efficiency by Western blot of input, unbound, and eluted fractions

  • Identify co-precipitating partners by mass spectrometry

  • Validate interactions by reciprocal co-IP with antibodies against interacting proteins

How can At2g31390 antibody be used to investigate changes in protein expression during plant stress responses?

For quantitative analysis of At2g31390 during stress responses:

• Experimental design:

  • Subject plants to relevant stresses (drought, salt, pathogens)

  • Harvest tissues at multiple time points (0, 1, 3, 6, 12, 24, 48 hours)

  • Include biological replicates (n≥3) for statistical validity

• Quantitative Western blot analysis:

  • Extract proteins under denaturing conditions

  • Perform Western blotting with At2g31390 antibody

  • Use fluorescent secondary antibodies for quantitative detection

  • Include internal loading controls (actin, GAPDH, tubulin)

  • Analyze using image quantification software

• Data analysis and presentation:

• Correlation with functional changes:

  • Combine protein level data with enzyme activity assays

  • Compare with transcriptional changes using qRT-PCR

  • Analyze subcellular redistribution using fractionation and immunofluorescence

What approaches can I use to study post-translational modifications of At2g31390?

To investigate PTMs of At2g31390:

• Phosphorylation analysis:

  • Immunoprecipitate At2g31390 using specific antibody

  • Analyze by Western blot with phospho-specific antibodies (anti-pSer, anti-pThr, anti-pTyr)

  • For site identification, perform IP followed by phosphoproteomic MS analysis

  • Compare phosphorylation status under different conditions (normal vs. stress)

• Other PTM investigations:

  • For glycosylation: Perform lectin blotting after IP

  • For ubiquitination: Conduct IP under denaturing conditions followed by anti-ubiquitin blotting

  • For SUMOylation: Use anti-SUMO antibodies after IP

• PTM site mapping and functional significance:

• Validating PTM significance:

  • Generate site-directed mutants (S→A, T→A, K→R)

  • Express in knockout backgrounds

  • Assess effects on protein function, localization, and stability

How can I use At2g31390 antibody to investigate protein-protein interactions in metabolic pathways?

For comprehensive analysis of At2g31390 protein interactions:

• Co-immunoprecipitation approaches:

  • Perform IP with At2g31390 antibody under native conditions

  • Analyze co-precipitated proteins by mass spectrometry

  • Confirm specific interactions by reciprocal co-IP and Western blotting

  • Compare interaction profiles under normal vs. stress conditions

• Proximity-dependent labeling:

  • Generate fusion proteins of At2g31390 with BioID or APEX2

  • Express in Arabidopsis via transformation

  • Activate proximity labeling

  • Purify biotinylated proteins and identify by MS

• In situ interaction visualization:

  • Perform proximity ligation assay (PLA) using At2g31390 antibody and antibodies against candidate interactors

  • Analyze PLA signals by confocal microscopy to visualize and quantify interactions in native contexts

• Functional validation of interactions:

  • Perform enzyme activity assays with purified proteins

  • Test effects of interaction disruption on metabolic flux

  • Analyze phenotypes of plants with mutations in interacting partners

Why might I be experiencing non-specific binding with my At2g31390 antibody?

Non-specific binding issues can be addressed through systematic optimization:

• Common causes:

  • Cross-reactivity with related plant proteins

  • Inadequate blocking

  • Excessive antibody concentration

  • Sample overloading

  • Plant-specific interfering compounds

• Optimization strategies:

• Plant-specific considerations:

  • Add polyvinylpyrrolidone (PVP) to extraction buffers to remove phenolic compounds

  • Include additional protease inhibitors to prevent degradation products

  • Consider the effects of plant tissue type and developmental stage on background

What are optimal storage conditions for maintaining At2g31390 antibody activity?

For maximum antibody stability and performance:

• Storage recommendations:

  • Store concentrated antibody (1-5 mg/ml) in small aliquots (10-50 μl)

  • For long-term storage: -20°C or -80°C in 50% glycerol

  • For working solutions: 4°C for up to 2 weeks with 0.02% sodium azide

  • Avoid repeated freeze-thaw cycles (maximum 5 cycles)

• Stability data:

• Handling best practices:

  • Thaw frozen aliquots completely before use

  • Mix gently by pipetting or flicking, avoid vortexing

  • Centrifuge briefly to collect contents before opening

  • Prepare fresh dilutions for each experiment

  • Document lot information and performance characteristics

How can I address weak signal issues when using At2g31390 antibody?

To improve detection sensitivity for At2g31390:

• Sample preparation optimization:

  • Enrich for subcellular fractions where At2g31390 is predominantly localized

  • Use TCA precipitation to concentrate proteins

  • Add protease inhibitors to prevent degradation

  • Optimize extraction buffer composition for plant tissues

• Signal enhancement strategies:

  • Increase antibody concentration (2-5× recommended dilution)

  • Extend primary antibody incubation (overnight at 4°C)

  • Use high-sensitivity detection reagents (enhanced ECL substrates)

  • Apply signal amplification systems (tyramide signal amplification, biotin-streptavidin)

• Technical considerations:

  • Ensure transfer efficiency during Western blotting using reversible stains

  • Optimize exposure times for imaging

  • Use cooled CCD cameras for detection rather than film

  • Consider specialized detection systems for low-abundance proteins

• Controls to include:

  • Positive control (tissue with known high expression)

  • Loading control (constitutive protein)

  • Standard curve with recombinant protein (if available)

How can I use At2g31390 antibody in chromatin immunoprecipitation (ChIP) studies?

For ChIP applications investigating potential DNA-binding roles:

• Sample preparation:

  • Cross-link plant tissue with 1% formaldehyde for 10 minutes

  • Quench with 0.125M glycine

  • Extract and shear chromatin to 200-500bp fragments

  • Pre-clear with protein G beads

• Immunoprecipitation:

  • Incubate chromatin with At2g31390 antibody overnight

  • Capture complexes with protein G beads

  • Wash stringently to remove non-specific binding

  • Reverse cross-links and purify DNA

• Analysis approaches:

  • Perform qPCR for suspected target regions

  • Conduct ChIP-seq for genome-wide binding profile

  • Compare binding patterns under different conditions

• Validation strategies:

  • Include IgG control ChIP

  • Analyze in knockout backgrounds as negative control

  • Confirm findings with orthogonal methods

What considerations are important when using At2g31390 antibody across different plant species?

When extending At2g31390 antibody use to other species:

• Sequence conservation analysis:

  • Perform sequence alignment of At2g31390 orthologs across species

  • Identify conserved and variable regions

  • Determine if epitope regions recognized by the antibody are conserved

• Cross-reactivity testing:

• Optimization for non-model species:

  • Test different extraction methods optimized for each species

  • Adjust antibody concentrations and incubation conditions

  • Consider generating species-specific antibodies for distantly related plants