At5g65350 Antibody

What is AT5G65350 and what is its function in Arabidopsis thaliana?

AT5G65350 is a gene in Arabidopsis thaliana that encodes a protein involved in RNA processing pathways. Based on current research, this gene appears to be associated with transcriptional and post-transcriptional regulatory mechanisms that influence gene expression patterns in plant cells . The protein encoded by AT5G65350 has been detected in studies examining RNA splicing machinery and may have connections to Cajal body (CB) function, which are nuclear suborganelles involved in RNA processing .

Experimental characterization typically involves:

• Transcriptome analysis to assess expression patterns

• Protein localization studies using fluorescent tags

• Mutant phenotype characterization across development stages

• Protein-protein interaction studies to identify functional partners

How is AT5G65350 expression regulated in different Arabidopsis tissues?

AT5G65350 expression patterns vary across tissue types and developmental stages. Transcriptome-based analyses have revealed differential expression patterns dependent on hormonal signaling pathways, particularly cytokinin signaling . Regulation appears to involve both transcriptional control mechanisms and potential epigenetic modifications.

Studies examining habituated versus non-habituated callus tissue have shown that genes like AT5G65350 may be differentially regulated in response to hormonal cues . This regulation involves:

• Transcriptional regulation through promoter elements

• Potential post-transcriptional regulation through splicing mechanisms

• Possible epigenetic control through DNA methylation or histone modifications

• Integration with hormone signaling networks, particularly cytokinin pathways

What criteria should be used when selecting an antibody against AT5G65350 protein?

When selecting an antibody against the AT5G65350 protein product, researchers should consider:

• Epitope selection: Choose antibodies raised against unique protein domains to avoid cross-reactivity with related proteins in the Arabidopsis proteome.

• Antibody format: Consider polyclonal versus monoclonal options based on experimental requirements:

  • Polyclonal antibodies offer higher sensitivity but potentially lower specificity

  • Monoclonal antibodies provide consistent results with higher specificity

• Validation data: Prioritize antibodies with demonstrated specificity in Western blotting, immunoprecipitation, or immunofluorescence microscopy applications. Published research utilizing the antibody in similar experimental contexts provides valuable validation information .

• Controls: Ensure availability of appropriate negative controls (ideally knockout mutants lacking AT5G65350) and positive controls (tissues with confirmed high expression levels) for validation experiments.

• Application compatibility: Verify the antibody is suitable for intended applications (Western blotting, immunoprecipitation, ChIP, immunofluorescence, etc.) as performance can vary significantly between applications.

What methods are most effective for validating an AT5G65350 antibody?

Comprehensive validation of an AT5G65350 antibody should include:

• Western blot analysis:

  • Compare wild-type and mutant tissue extracts to confirm specificity

  • Expected molecular weight correlation with predicted protein size

  • Test multiple tissue types to confirm expression patterns

• Immunoprecipitation followed by mass spectrometry:

  • Identification of AT5G65350 as the primary precipitated protein

  • Analysis of co-precipitated proteins for interaction studies

  • Quantitative verification using AQUA methodologies for precise protein quantification

• Immunofluorescence microscopy:

  • Subcellular localization consistent with predicted function

  • Colocalization with known interaction partners

  • Absence of signal in knockout mutants

• Cross-validation with tagged proteins:

  • Parallel experiments with epitope-tagged versions (GFP, FLAG, etc.)

  • Confirmation that antibody and tag-based detection methods yield consistent results

• Knockout/knockdown controls:

  • Comparison with CRISPR-generated knockout lines

  • RNAi-mediated knockdown for partial reduction

  • Analysis of EMS-induced mutations affecting AT5G65350

How should Western blotting be optimized for AT5G65350 detection?

Optimizing Western blotting for AT5G65350 detection requires addressing several critical parameters:

• Sample preparation:

  • Use extraction buffer containing: 50mM Tris-HCl (pH 7.5), 150mM NaCl, 5mM EDTA, 5mM EGTA, 0.1% NP-40, 1mM PMSF, 5μM MG132, phosphatase inhibitor cocktails, and protease inhibitor cocktail

  • Sonication followed by centrifugation (20,000g for 10 min at 4°C) to remove insoluble debris

  • Protein concentration determination using Bradford or BCA assay

• Gel electrophoresis conditions:

  • 10-12% SDS-PAGE typically appropriate for AT5G65350 resolution

  • Include positive controls (e.g., coi1 single mutant) and negative controls (knockout line)

  • Load equal protein amounts (typically 20-30μg per lane)

• Transfer parameters:

  • Semi-dry or wet transfer systems both applicable

  • PVDF membrane preferable over nitrocellulose for stronger protein binding

  • Transfer verification using reversible protein stains (Ponceau S)

• Antibody incubation:

  • Blocking with 5% non-fat dry milk or BSA (3-5% in TBST)

  • Primary antibody dilution determination through titration experiments (typically 1:1000 to 1:5000)

  • Secondary antibody selection based on detection method (HRP, fluorescent, etc.)

• Signal detection:

  • Enhanced chemiluminescence (ECL) for standard detection

  • Fluorescently-labeled secondary antibodies for multiplexing

  • Quantification controls should include loading control proteins (tubulin, actin, etc.)

What are the optimal conditions for immunoprecipitating AT5G65350 and its interacting partners?

Based on successful protocols with similar plant proteins, the following conditions are recommended for AT5G65350 immunoprecipitation:

• Cell lysis and extraction:

  • Grind tissue in liquid nitrogen followed by extraction in buffer containing: 50mM Tris-HCl (pH 7.5), 150mM NaCl, 5mM EDTA, 5mM EGTA, 0.1% NP-40, 1mM PMSF, 5μM MG132, phosphatase inhibitor cocktails, and protease inhibitor cocktail

  • Sonication to disrupt nuclear membranes and release nuclear proteins

  • Centrifugation at 20,000g for 10 minutes at 4°C (twice) to clear lysates

• Immunoprecipitation procedure:

  • Pre-clear lysate with protein A/G beads to reduce non-specific binding

  • Incubate cleared lysate with AT5G65350 antibody (typically 2-5μg antibody per mg of total protein)

  • Capture antibody-antigen complexes using protein A/G magnetic beads

  • For tagged versions, use appropriate affinity resins (Anti-FLAG M2 Magnetic Beads for FLAG-tagged constructs, RFP-trap magnetic beads for RFP-tagged proteins)

• Washing conditions:

  • Multiple washes (4-5) with extraction buffer containing reduced detergent (0.05% NP-40)

  • Final washes with detergent-free buffer to remove detergent residues

• Elution methods:

  • For mass spectrometry analysis: on-bead digestion with trypsin

  • For Western blotting: direct elution in SDS sample buffer

  • For native complex isolation: elution with excess epitope peptide

• Mass spectrometry analysis:

  • LC-MS/MS analysis with a linear 90-minute gradient at 300 nL/min flow rate

  • Database search against Araport_11 using Proteome Discoverer (version 2.2)

  • Peptide precursor mass tolerance of 10 ppm and MS/MS tolerance of 0.02 Da

  • False discovery rate (FDR) at protein and peptide level set at 1%

How can AT5G65350 antibodies be applied in immunofluorescence microscopy studies?

Immunofluorescence microscopy for AT5G65350 localization requires specialized protocols for plant tissues:

• Sample preparation:

  • Root tips or leaf protoplasts are optimal for subcellular localization studies

  • Fixation with 4% paraformaldehyde in PBS for 20-30 minutes

  • Cell wall digestion may be necessary for improved antibody penetration

  • Permeabilization with 0.1-0.5% Triton X-100 in PBS

• Antibody incubation:

  • Blocking with 2-3% BSA in PBS for 1 hour at room temperature

  • Primary antibody dilution (typically 1:100 to 1:500) in blocking buffer, overnight at 4°C

  • Multiple washes with PBS containing 0.1% Tween-20

  • Fluorescently-labeled secondary antibody (1:500 to 1:1000) for 1-2 hours at room temperature

• Co-localization studies:

  • Dual labeling with markers for nuclear bodies such as coilin for Cajal bodies

  • Counterstaining with DAPI for nuclear visualization

  • If using GFP-tagged constructs, ensure fluorophore selection avoids spectral overlap

• Imaging parameters:

  • Confocal microscopy with appropriate filter sets

  • Z-stack acquisition for 3D reconstruction

  • Quantification of signal intensity and co-localization coefficients

• Controls and validation:

  • Parallel imaging of knockout mutants as negative controls

  • Secondary antibody-only controls to assess background

  • Comparison with published localization data for similar proteins

What are common issues in AT5G65350 Western blot detection and how can they be resolved?

Researchers commonly encounter several challenges when performing Western blots for AT5G65350 detection:

How should researchers interpret contradictory results between antibody-based detection and transcript expression data for AT5G65350?

When faced with discrepancies between protein detection and transcript expression:

• Evaluate post-transcriptional regulation:

  • Assess alternative splicing events using RNA-seq data. AT5G65350 may undergo intron retention (IR), exon skipping (ES), or alternative donor-acceptor (altDA) events that affect protein expression

  • Compare splicing patterns across different tissue types and conditions

  • Consider analysis of mutants affecting splicing factors to determine if AT5G65350 is differentially spliced

• Examine protein stability factors:

  • Investigate protein half-life through cycloheximide chase experiments

  • Test proteasome inhibitors (MG132) to assess degradation pathways

  • Consider tissue-specific or condition-specific post-translational regulation

• Validate with complementary approaches:

  • Epitope-tagged transgenic lines expressing AT5G65350 under native promoter

  • Mass spectrometry-based absolute quantification (AQUA) to determine protein levels

  • Reporter gene fusions to monitor translational efficiency

• Cross-reference with transcriptome data:

  • Compare with published transcriptome databases for expression patterns

  • Consider cytokinin or other hormone treatments that may affect expression levels

  • Analyze habituated versus non-habituated tissues for differential regulation patterns

• Statistical analysis:

  • Apply appropriate statistical methods similar to transcriptome studies:

    • Significance Analysis of Microarrays (SAM)

    • t-tests with appropriate multiple testing correction

    • Analysis of Variance (ANOVA) for multi-factor experiments

How can AT5G65350 antibodies be applied in chromatin immunoprecipitation (ChIP) studies?

For researchers investigating potential chromatin associations of AT5G65350:

• Sample preparation optimization:

  • Crosslinking with 1% formaldehyde for 10-15 minutes

  • Quenching with 0.125M glycine

  • Nuclear isolation before sonication to enrich for nuclear proteins

  • Sonication calibration to achieve 200-500bp DNA fragments

• Immunoprecipitation protocol adaptations:

  • Pre-clearing with salmon sperm DNA and protein A/G beads

  • Higher antibody concentrations than standard IP (typically 5-10μg)

  • Extended incubation times (overnight at 4°C with rotation)

  • Stringent washing conditions to reduce background

• Controls and validation:

  • Input DNA samples (pre-IP) as normalization controls

  • IgG negative controls to establish background levels

  • Positive control antibodies against histone modifications

  • qPCR validation of enriched regions before sequencing

• Data analysis considerations:

  • Peak calling algorithms appropriate for transcription factor or chromatin factor binding

  • Integration with RNA-seq data to correlate binding with expression

  • Motif analysis to identify potential DNA binding sequences

  • Comparison with known chromatin regulators and histone modifications

• Biological interpretation:

  • Assess overlap with genes involved in cytokinin signaling pathways

  • Compare with datasets for chromatin regulatory factors

  • Evaluate correlation with specific histone modifications

  • Determine cell type or developmental stage specificity

What approaches can be used to study AT5G65350 involvement in alternative splicing regulation?

Given the potential connection to splicing mechanisms, researchers could explore:

• RNA immunoprecipitation (RIP) protocols:

  • Modified IP protocol optimized for RNA-protein interactions

  • Crosslinking with formaldehyde or UV to capture direct RNA interactions

  • RNase inhibitor addition to all buffers

  • RT-qPCR or RNA-seq analysis of precipitated RNA species

• Splicing reporter systems:

  • GFP splicing reporters in wild-type and AT5G65350 mutant backgrounds

  • Analysis of splicing patterns using fluorescence microscopy and RT-PCR

  • Quantification of splicing efficiency across different tissues and conditions

• Mutant analysis approaches:

  • Characterization of multiple alleles through complementation tests

  • Analysis of single and double mutants with other splicing factors

  • Assessment of suppressor mutations that rescue phenotypes

  • Next-generation mapping (NGM) to identify causative mutations

• Splicing event quantification:

  • Analysis of alternative splicing events including:

    • Intron retention (IR): counts of unspliced introns

    • Exon skipping (ES): counts of splicing reads skipping exon(s)

    • Alternative donor-acceptor (altDA): counts of reads supporting specific donor-acceptor pairs

  • Statistical analysis using chi-squared test for goodness-of-fit to discover differential preference of AS events between samples

  • An AS event is typically considered significant if its P-value is below 0.05

How can researchers investigate the role of AT5G65350 in relation to Cajal bodies and RNA processing?

To explore potential functions in nuclear bodies such as Cajal bodies:

• Co-localization studies:

  • Immunofluorescence microscopy with coilin antibodies (marker for Cajal bodies)

  • Live-cell imaging with fluorescently tagged AT5G65350 and coilin

  • Super-resolution microscopy for detailed structural analysis

  • Quantification of co-localization coefficients across cell types and conditions

• Interaction partner identification:

  • Immunoprecipitation followed by mass spectrometry

  • Proximity labeling approaches (BioID, APEX) to identify neighboring proteins

  • Yeast two-hybrid screening for direct interaction partners

  • Split-GFP complementation to validate interactions in planta

• Functional analysis in Cajal body mutants:

  • Analysis of AT5G65350 localization in coilin mutant backgrounds (ncb mutant)

  • Assessment of splicing efficiency in various mutant combinations

  • Comparison with other Cajal body components (DCL enzymes, ARGONAUTE proteins)

  • Evaluation of siRNA-mediated gene silencing in AT5G65350 mutants

• RNA processing assessment:

  • Analysis of small RNA populations in wild-type vs. mutant backgrounds

  • Northern blotting for specific RNA species

  • RNA-seq to identify global changes in RNA processing

  • Investigation of connections to RNA-directed DNA methylation (RdDM) pathways

What methodologies are most appropriate for studying AT5G65350 involvement in epigenetic regulation?

For researchers exploring potential epigenetic roles:

• Chromatin state analysis:

  • ChIP-seq for histone modifications in wild-type vs. mutant backgrounds

  • DNA methylation profiling using bisulfite sequencing

  • Chromatin accessibility assays (ATAC-seq, DNase-seq)

  • 3D chromatin conformation studies (Hi-C, 4C) to assess higher-order structure

• Gene silencing pathway connections:

  • Analysis of small RNA populations (24-nt siRNAs)

  • Investigation of connections to RNA-directed DNA methylation (RdDM)

  • Assessment of DNA methylation levels at specific target loci

  • Evaluation of transcriptional gene silencing (TGS) and post-transcriptional gene silencing (PTGS) mechanisms

• Protein complex characterization:

  • Gel filtration chromatography to identify native complex size

  • Blue native PAGE to preserve protein complexes

  • Chromatin remodeling assays to assess functional consequences

  • Integration with transcriptome data to identify target genes

• Hormone signaling integration:

  • Analysis of cytokinin signaling components (CRE1, cytokinin oxidases)

  • Investigation of hormone-responsive gene expression

  • Comparison of habituated and non-habituated cell cultures

  • Assessment of epigenetic stability across generations or cell divisions

How can new proteomic technologies enhance AT5G65350 antibody-based research?

Emerging proteomic approaches offer new possibilities for AT5G65350 research:

• Advanced quantification methods:

  • AQUA (absolute quantification) using isotope-labeled peptide standards for precise quantification of AT5G65350 protein levels

  • TMT (tandem mass tag) labeling for multiplexed quantitative proteomics

  • SILAC approaches adapted for plant systems (when possible)

  • Targeted proteomics using selected/multiple reaction monitoring (SRM/MRM)

• Structural proteomics integration:

  • Hydrogen-deuterium exchange mass spectrometry (HDX-MS) to map protein interactions

  • Crosslinking mass spectrometry (XL-MS) to identify spatial relationships within complexes

  • Native mass spectrometry to determine complex stoichiometry

  • Cryo-EM structural studies of purified complexes

• Single-cell applications:

  • Adaptation of antibody-based detection for single-cell proteomics

  • Spatial proteomics to map protein distributions across tissues

  • Integration with single-cell transcriptomics for multi-omics analysis

  • Mass cytometry (CyTOF) approaches for high-dimensional protein data

• PTM landscape characterization:

  • Phosphoproteomics to identify regulatory phosphorylation sites

  • Ubiquitylation profiling to assess protein stability regulation

  • Acetylation and methylation analysis for epigenetic connections

  • Glycosylation analysis if applicable

What considerations are important when designing AT5G65350 knockout validation experiments?

When validating AT5G65350 knockouts for antibody specificity testing:

• Mutation strategy selection:

  • CRISPR/Cas9 gene editing for complete knockout

  • T-DNA insertion collections for potential loss-of-function alleles

  • EMS mutagenesis for point mutations and partial loss-of-function

  • RNAi-mediated knockdown for dose-dependent analysis

• Validation requirements:

  • Genotyping confirmation at DNA level

  • Transcript analysis using RT-qPCR to confirm expression reduction

  • Protein-level confirmation by Western blotting with AT5G65350 antibody

  • Phenotypic characterization consistent with gene function

• Common challenges:

  • Potential genetic redundancy with paralogs

  • Developmental lethality if gene is essential

  • Position effects in transgenic complementation lines

  • Distinguishing between direct and indirect effects

• Experimental controls:

  • Multiple independent mutant alleles to confirm phenotypes

  • Complementation with wild-type gene to rescue phenotypes

  • Tissue-specific or inducible knockout systems for essential genes

  • Appropriate wild-type controls matched for genetic background

• Advanced mutant analysis:

  • Recessive versus dominant nature of mutations

  • Complementation tests between different alleles

  • Next-generation mapping (NGM) to identify causative mutations

  • Double mutant analysis to investigate genetic interactions