Os04g0500900 Antibody

What is Os04g0500900 and what does its antibody target?

Os04g0500900 is a gene in Oryza sativa subsp. japonica (Rice) that encodes a probable protein phosphatase 2C 42 (EC 3.1.3.16). The antibody developed against this protein specifically targets the recombinant protein product of this gene. This protein belongs to the family of protein phosphatase 2C enzymes, which play crucial roles in signal transduction pathways and cellular regulation in plants. The Os04g0500900 antibody recognizes epitopes on this protein, enabling researchers to detect and study its expression, localization, and function in rice and related species .

What are the key properties of commercially available Os04g0500900 antibodies?

The commercially available Os04g0500900 antibody is a polyclonal antibody raised in rabbits using recombinant Oryza sativa subsp. japonica Os04g0500900 protein as the immunogen. It is supplied in liquid form, utilizing a storage buffer composed of 50% glycerol, 0.01M PBS (pH 7.4), and 0.03% Proclin 300 as a preservative. The antibody is purified using antigen affinity chromatography methods and has the IgG isotype. It is specifically designed to react with Oryza sativa subsp. japonica (Rice) and has been validated for applications including ELISA and Western Blot .

How should Os04g0500900 antibody be stored to maintain optimal activity?

For optimal activity maintenance, the Os04g0500900 antibody should be stored at either -20°C or -80°C immediately upon receipt. Repeated freeze-thaw cycles should be strictly avoided as they can compromise antibody performance by causing protein denaturation and aggregation. When working with the antibody, it's recommended to prepare smaller working aliquots that can be thawed once and used, rather than repeatedly freezing and thawing the entire stock. The antibody is typically shipped at 4°C but should be transferred to appropriate frozen storage promptly upon arrival in the laboratory .

What are the validated applications for Os04g0500900 antibody in plant research?

The Os04g0500900 antibody has been validated for specific research applications including Enzyme-Linked Immunosorbent Assay (ELISA) and Western Blot (WB). For ELISA applications, the antibody can be used to quantify Os04g0500900 protein levels in plant tissue extracts and can serve as either a capture or detection antibody depending on the assay format. In Western Blot applications, the antibody can detect the native and recombinant forms of the protein following proper sample preparation and electrophoretic separation. The antibody enables researchers to investigate protein expression patterns, post-translational modifications, and regulatory mechanisms involving the Os04g0500900 gene product in rice and potentially in closely related species .

How should samples be prepared for Western Blot using Os04g0500900 antibody?

For optimal Western Blot results with Os04g0500900 antibody, follow this methodological approach:

• Tissue extraction: Grind fresh or frozen rice tissue in appropriate extraction buffer (typically containing 50mM Tris-HCl pH 7.5, 150mM NaCl, 1% Triton X-100, 0.1% SDS, 1mM EDTA, and protease inhibitor cocktail).

• Protein quantification: Use Bradford or BCA assay to normalize protein loading.

• Sample preparation: Mix tissue extracts with Laemmli buffer (containing 2-mercaptoethanol) and heat at 95°C for 5 minutes.

• Electrophoresis: Load 20-50μg protein per lane on 10-12% SDS-PAGE gel.

• Transfer: Transfer proteins to PVDF or nitrocellulose membrane at 100V for 60-90 minutes.

• Blocking: Block with 5% non-fat milk in TBST (TBS + 0.1% Tween-20) for 1 hour at room temperature.

• Primary antibody incubation: Dilute Os04g0500900 antibody 1:1000 to 1:2000 in blocking solution and incubate overnight at 4°C.

• Washing: Wash membrane 3× with TBST, 5 minutes each.

• Secondary antibody: Incubate with HRP-conjugated anti-rabbit IgG at 1:5000 dilution for 1 hour at room temperature.

• Detection: Visualize using ECL substrate and appropriate imaging system.

This protocol should be optimized for specific research conditions and sample types .

What are the recommended dilutions and incubation conditions for ELISA using this antibody?

For ELISA applications with Os04g0500900 antibody, the following methodological details should be considered:

• For direct ELISA:

  • Coating: Dilute antigen in carbonate/bicarbonate buffer (pH 9.6) and coat wells overnight at 4°C

  • Blocking: 2-3% BSA in PBS for 1-2 hours at room temperature

  • Primary antibody: Dilute Os04g0500900 antibody 1:500 to 1:2000 in blocking buffer

  • Incubation: 2 hours at room temperature or overnight at 4°C

  • Detection: HRP-conjugated secondary antibody (1:5000-1:10000) followed by TMB substrate

• For sandwich ELISA:

  • Capture antibody: If using Os04g0500900 antibody as capture, dilute 1:1000 in coating buffer

  • Detection antibody: If using as detection antibody, dilute 1:2000 in appropriate buffer

  • Sample incubation: Typically 1-2 hours at room temperature

  • Signal development: 15-30 minutes with appropriate substrate

Each laboratory should perform preliminary experiments to optimize these conditions for their specific samples and equipment. Standard curves using recombinant Os04g0500900 protein are recommended for quantitative applications .

What are common issues when using Os04g0500900 antibody in Western blots and how can they be resolved?

When working with Os04g0500900 antibody in Western blot applications, researchers may encounter several technical challenges that can be systematically addressed:

These methodological approaches should be adjusted based on specific experimental conditions and the particular rice variety or tissue being studied .

How can researchers validate the specificity of Os04g0500900 antibody for their experimental system?

To rigorously validate the specificity of Os04g0500900 antibody for a particular experimental system, researchers should implement a multi-faceted approach:

• Positive control validation: Use purified recombinant Os04g0500900 protein (≥85% purity) as a positive control in Western blot or ELISA to confirm antibody recognition of the target.

• Competitive inhibition assay: Pre-incubate the antibody with excess purified antigen before using in immunoassays; specific binding should be significantly reduced.

• Genetic validation: Compare signal between wild-type rice and Os04g0500900 knockdown/knockout lines if available; signal should be reduced or absent in knockout lines.

• Cross-species analysis: Test reactivity in closely related grass species to determine conservation of the recognized epitope.

• Immunoprecipitation followed by mass spectrometry: Confirm the identity of the pulled-down protein as Os04g0500900/protein phosphatase 2C 42.

• Peptide array analysis: Identify the specific epitopes recognized by the antibody using overlapping peptide arrays derived from the Os04g0500900 sequence.

This comprehensive validation ensures that experimental results can be confidently attributed to the targeted protein rather than non-specific interactions .

What quality control tests should be performed before using a new lot of Os04g0500900 antibody?

Before incorporating a new lot of Os04g0500900 antibody into established experimental protocols, researchers should perform these essential quality control tests:

• Comparative Western blot analysis: Run the new antibody lot alongside a previously validated lot using identical samples and protocols to assess consistency in band pattern, intensity, and specificity.

• Titer determination: Perform an ELISA with serial dilutions of the antibody against a fixed concentration of recombinant Os04g0500900 protein to establish the new lot's effective working dilution.

• Cross-reactivity assessment: Test against recombinant protein homologs from related plant species to confirm specificity and potential cross-reactivity profiles.

• Signal-to-noise evaluation: Compare specific signal intensity to background in both Western blot and ELISA formats to ensure optimal performance.

• Stability analysis: Test antibody performance after multiple freeze-thaw cycles to assess lot-specific sensitivity to handling conditions.

These methodological quality control steps are critical for maintaining experimental reproducibility across studies utilizing different antibody preparations .

How can Os04g0500900 antibody be used to study protein-protein interactions in stress signaling pathways?

The Os04g0500900 antibody can be leveraged to investigate protein-protein interactions in plant stress signaling networks through these advanced methodological approaches:

• Co-immunoprecipitation (Co-IP): Use Os04g0500900 antibody to pull down the protein phosphatase 2C 42 complex from rice tissues under various stress conditions (drought, salinity, temperature extremes), followed by mass spectrometry analysis to identify interacting partners. This approach can reveal condition-specific protein interactions.

• Proximity-dependent biotin identification (BioID): Couple this technique with Os04g0500900 antibody validation to confirm proximity interactions in living plant cells.

• Bimolecular Fluorescence Complementation (BiFC): Use antibody for validation of potential interacting partners initially identified through BiFC screening.

• Chromatin Immunoprecipitation (ChIP): If the phosphatase interacts with transcription factors, Os04g0500900 antibody can help identify these interactions and their genomic targets.

• Förster Resonance Energy Transfer (FRET) validation: Use the antibody to confirm the specificity of FRET signals observed between fluorescently-tagged candidate interacting proteins.

These techniques, when combined with appropriate controls and validation methods, enable researchers to construct comprehensive interaction networks involving this protein phosphatase in stress response pathways .

What are the considerations for using Os04g0500900 antibody in immunolocalization studies?

When employing Os04g0500900 antibody for subcellular localization studies, researchers should consider these specialized methodological aspects:

• Fixation optimization: Test multiple fixatives (4% paraformaldehyde, glutaraldehyde combinations) to preserve both antigenicity and cellular architecture of plant tissues.

• Embedding and sectioning: For rice tissues, paraffin embedding followed by 5-8μm sectioning is typically effective, but cryo-sectioning may better preserve antigenicity.

• Epitope retrieval: Test heat-induced epitope retrieval (citrate buffer, pH 6.0, 95°C for 10 minutes) and enzymatic retrieval methods to optimize antibody accessibility.

• Blocking optimization: Rice tissues often require more robust blocking (5% BSA + 5% normal serum) to reduce non-specific binding.

• Primary antibody dilution: Start with 1:100-1:500 dilutions for immunohistochemistry, optimizing based on signal-to-noise ratio.

• Detection system selection: For fluorescence detection, evaluate both directly labeled secondary antibodies and amplification systems (tyramide signal amplification) based on expression level.

• Counterstaining: Use DAPI for nuclear visualization and specific organelle markers to determine precise subcellular localization.

• Controls: Include both technical controls (omitting primary antibody) and biological controls (tissues from knockout/knockdown plants) to validate specificity.

These considerations help ensure reliable subcellular localization of the Os04g0500900 gene product in different rice tissues and developmental stages .

How can researchers apply active learning strategies to improve antibody-antigen binding prediction for Os04g0500900 and related proteins?

Researchers can implement active learning strategies to enhance antibody-antigen binding prediction for Os04g0500900 and related proteins through this methodological framework:

• Initial data acquisition: Begin with a small labeled dataset of experimentally verified binding interactions between Os04g0500900 antibody and various epitope variants.

• Model selection: Implement machine learning algorithms capable of handling many-to-many relationships, such as graph neural networks or attention-based models.

• Uncertainty sampling: Identify protein variants with highest prediction uncertainty for prioritized experimental testing.

• Diversity-based selection: Ensure sampled epitope variants maximize structural and sequence diversity to improve model generalization.

• Batch-mode active learning: Design optimal batches of experiments that balance exploration (testing diverse variants) and exploitation (refining knowledge of promising regions).

• Cross-validation strategy: Implement out-of-distribution validation to ensure model performance on novel variants not represented in training data.

• Iterative refinement: After each experimental round, retrain models with newly labeled data and evaluate performance improvements.

Recent research has demonstrated that active learning strategies can reduce the number of required experimental samples by up to 35% and accelerate the learning process by approximately 28 steps compared to random sampling approaches. This methodology is particularly valuable for predicting binding interactions with rice protein variants where experimental data generation is costly and time-consuming .

What analytical techniques can be combined with Os04g0500900 antibody to study post-translational modifications of the target protein?

To comprehensively analyze post-translational modifications (PTMs) of the Os04g0500900 protein, researchers can integrate the following analytical techniques with antibody-based detection:

• Phospho-specific Western blotting: Use Os04g0500900 antibody in combination with phospho-specific detection methods to identify phosphorylation states of the protein phosphatase 2C, which may regulate its activity. This involves:

  • Sequential immunoblotting with Os04g0500900 antibody and phospho-specific antibodies

  • Treatment with phosphatases to confirm specificity of phosphorylation signals

  • Comparison across different stress conditions to map regulatory phosphorylation events

• Immunoprecipitation coupled to mass spectrometry (IP-MS):

  • Enrich Os04g0500900 protein using the specific antibody

  • Perform tryptic digestion of the immunoprecipitated protein

  • Analyze by LC-MS/MS with neutral loss scanning to detect phosphorylation

  • Implement SILAC or TMT labeling for quantitative comparison across conditions

• 2D gel electrophoresis with immunodetection:

  • Separate proteins by isoelectric point and molecular weight

  • Transfer to membrane and probe with Os04g0500900 antibody

  • Identify charge variants representing different PTM states

• Phos-tag™ SDS-PAGE:

  • Incorporate Phos-tag™ reagent into polyacrylamide gels

  • Detect mobility shifts with Os04g0500900 antibody to visualize phosphorylated variants

  • Compare mobility patterns after treatment with various phosphatases

These integrated approaches provide comprehensive insights into how post-translational modifications regulate the function of Os04g0500900 protein phosphatase during plant development and stress responses .

How does the specificity of Os04g0500900 antibody compare across different rice varieties and related grass species?

The Os04g0500900 antibody, while primarily developed against Oryza sativa subsp. japonica protein, demonstrates variable cross-reactivity patterns across rice varieties and related grass species. This specificity profile can be methodologically characterized:

• Within Oryza genus:

  • Strong reactivity with Oryza sativa subsp. japonica (original immunogen source)

  • Moderate to high cross-reactivity with Oryza sativa subsp. indica, depending on protein sequence conservation

  • Variable reactivity with wild rice species based on evolutionary distance

• Related Poaceae family members:

  • Demonstrated cross-reactivity with Triticum aestivum (wheat) and Hordeum vulgare (barley) in immunoblotting applications

  • Potential reactivity with Setaria viridis and Panicum virgatum as indicated by specificity data

  • Decreasing reactivity correlating with evolutionary distance from rice

• Epitope conservation analysis:

  • Computational alignment of protein phosphatase 2C sequences across species

  • Identification of conserved regions that likely contain the epitope(s) recognized by the antibody

  • Correlation between sequence conservation and experimental cross-reactivity data

This cross-species reactivity profile makes the Os04g0500900 antibody a valuable tool for comparative studies of protein phosphatase 2C function across economically important grass species, though optimization of detection conditions may be required when working with more distant relatives .

What methodological adaptations are needed when using Os04g0500900 antibody in different experimental systems?

When applying Os04g0500900 antibody across different experimental systems, researchers must implement these methodological adaptations to maintain optimal performance:

• For different plant tissue types:

  • Leaves: Standard extraction buffers are generally effective

  • Seeds/grains: Additional detergents (0.5% NP-40) and mechanical disruption may be necessary

  • Roots: Higher concentrations of protease inhibitors to counter increased proteolytic activity

  • Reproductive tissues: Modified fixation protocols for immunohistochemistry (shorter fixation times)

• For related grass species:

  • Adjust antibody concentration: Typically 1.5-2× higher for wheat or barley compared to rice

  • Modified blocking conditions: 5% BSA + 2% normal serum for wheat to reduce background

  • Extended incubation times: Overnight at 4°C rather than 2 hours at room temperature

  • Species-specific secondary antibody optimization to minimize background

• For different developmental stages:

  • Seedling stage: Standard protocols generally effective

  • Reproductive stage: Increased sample amounts to account for potential lower expression

  • Stress conditions: Adaptive extraction buffers based on the specific stress (e.g., additional phosphatase inhibitors for abiotic stress studies)

• For different detection systems:

  • Chemiluminescence: 1:2000 primary antibody dilution typically optimal

  • Fluorescence detection: 1:1000 dilution with additional washing steps to reduce background

  • Colorimetric detection: Longer incubation times with substrate may be required

These systematic adaptations ensure consistent and reliable results when applying Os04g0500900 antibody across diverse experimental systems and research questions .