OsI_021818 Antibody

What is OsI_021818 Antibody and what are its target specifications?

OsI_021818 Antibody (product code CSB-PA387258XA01OFF) is a polyclonal antibody specifically developed for the detection of OsI_021818 protein from Oryza sativa subsp. indica (Rice). This research reagent is generated in rabbits using recombinant OsI_021818 protein as the immunogen. The target protein is identified in the UniProt database with the accession number A2YBX5. The antibody is purified using antigen affinity chromatography to ensure specificity for its target epitopes. As a polyclonal IgG antibody, it recognizes multiple epitopes on the target protein, providing robust detection capabilities across various experimental conditions. The product is specifically intended for research applications focused on rice biology and is not validated for diagnostic or therapeutic purposes .

The antibody has been specifically validated for enzyme-linked immunosorbent assay (ELISA) and Western blotting (WB) applications, making it suitable for both quantitative and qualitative protein detection in rice research. Understanding these specifications is essential for appropriate experimental design and interpretation of results in rice molecular biology studies .

What storage conditions are recommended to maintain OsI_021818 Antibody activity?

Proper storage of OsI_021818 Antibody is critical for maintaining its specificity and sensitivity in research applications. Upon receipt, the antibody should be stored at either -20°C or -80°C for long-term stability. It is particularly important to avoid repeated freeze-thaw cycles, as these can cause protein denaturation and significantly diminish antibody activity over time .

The antibody is provided in a specialized storage buffer designed to maintain stability during freezing. This buffer contains:

• Preservative: 0.03% Proclin 300 (antimicrobial agent)

• Constituents: 50% Glycerol (cryoprotectant)

• Buffer system: 0.01M PBS at pH 7.4 (physiological pH maintenance)

The high glycerol content serves as a cryoprotectant, preventing complete freezing at -20°C and protecting the antibody's tertiary structure. For optimal results, researchers should consider preparing working aliquots during initial thawing to minimize freeze-thaw cycles of the stock solution. When working with the antibody, it should be kept cold (on ice or at 4°C) and returned to frozen storage promptly after use to maximize shelf life and performance consistency.

What validated applications can OsI_021818 Antibody be used for?

OsI_021818 Antibody has been specifically validated for two primary applications: Enzyme-Linked Immunosorbent Assay (ELISA) and Western Blotting (WB). These validated applications enable researchers to perform both quantitative and qualitative analyses of the target protein in rice samples .

In ELISA applications, the antibody allows for quantitative measurement of OsI_021818 protein levels in solution-phase samples. This application is particularly useful for:

• Determining relative protein expression levels across different rice varieties

• Monitoring protein expression changes in response to environmental stimuli

• Quantifying protein concentrations in fractionated samples

For Western Blotting applications, the antibody enables visualization of the target protein after electrophoretic separation, providing information about:

• Molecular weight confirmation of the target protein

• Relative abundance in different samples

• Potential post-translational modifications indicated by band shifts

• Protein degradation patterns

The validation specifically notes its ability to "ensure identification of antigen," indicating that the antibody demonstrates sufficient specificity to distinguish the target protein from other proteins in complex rice samples . While these are the officially validated applications, researchers with expertise in immunological techniques may adapt protocols for use in other applications such as immunoprecipitation or immunohistochemistry, though such applications would require additional optimization and validation by individual laboratories.

How is OsI_021818 Antibody produced and what is its isotype classification?

OsI_021818 Antibody is produced through a systematic immunization process using purified recombinant Oryza sativa subsp. indica OsI_021818 protein as the immunogen. The antibody is raised in rabbits, which determines many of its functional characteristics and compatibility with secondary detection reagents in experimental applications .

From an immunoglobulin classification perspective, OsI_021818 Antibody is characterized as an IgG isotype, the predominant antibody class in serum and the most commonly used in research applications. Its polyclonal nature indicates that it was generated from multiple B cell lineages in the immunized rabbit, resulting in a heterogeneous mixture of antibodies that recognize different epitopes on the same target protein .

The polyclonal characteristic provides several important experimental advantages:

• Recognition of multiple epitopes increases detection sensitivity

• Greater tolerance to minor modifications in the target protein

• Enhanced robustness across various denaturing conditions in different assays

• Higher avidity due to binding at multiple sites on the target protein

The antibody undergoes antigen affinity purification to enhance specificity, involving passage through an affinity column containing immobilized OsI_021818 protein to selectively capture antibodies with specific binding capacity for the target . This purification process significantly reduces non-specific antibodies in the final product, improving the signal-to-noise ratio in experimental applications while maintaining the benefits of polyclonal recognition.

What is the composition of the storage buffer for OsI_021818 Antibody?

The OsI_021818 Antibody is supplied in a carefully formulated storage buffer designed to maintain antibody stability and activity during long-term storage. Understanding this buffer composition is essential for researchers planning experiments, as buffer components may influence assay performance or require dilution to achieve optimal working conditions .

The storage buffer consists of:

• Preservative: 0.03% Proclin 300

• Constituents: 50% Glycerol

• Buffer system: 0.01M PBS at pH 7.4

Each component serves a specific purpose in antibody preservation:

Proclin 300 (0.03%): This is a non-azide, non-mercury preservative that prevents microbial contamination during storage and handling. Unlike sodium azide (commonly used in antibody preparations), Proclin 300 does not inhibit peroxidase activity, making it compatible with HRP-based detection systems without additional washing steps.

Glycerol (50%): The high glycerol concentration serves multiple functions:

• Acts as a cryoprotectant to prevent damage during freezing

• Prevents complete freezing at -20°C, reducing freeze-thaw damage

• Stabilizes protein structure by preferential hydration

• Extends shelf-life by reducing molecular mobility

PBS at pH 7.4 (0.01M): The phosphate-buffered saline provides:

• pH stabilization near physiological conditions

• Appropriate ionic strength for protein stability

• Compatibility with most biological systems and assays

When designing experiments, researchers should consider potential buffer effects, especially the high glycerol content, which may necessitate greater dilution when used in applications sensitive to glycerol concentration.

What optimization strategies are recommended for Western blotting with OsI_021818 Antibody?

Western blotting with OsI_021818 Antibody requires careful optimization to achieve specific detection of the target protein in complex rice samples. The following methodological considerations address the unique challenges of plant protein analysis.

For sample preparation, rice tissues present distinct challenges compared to animal samples due to their complex matrix. For optimal results, use a plant-specific extraction buffer containing 100 mM Tris-HCl (pH 8.0), 150 mM NaCl, 1% Triton X-100, 1% sodium deoxycholate, supplemented with 2% polyvinylpolypyrrolidone (PVPP) to remove interfering phenolic compounds. Additionally, incorporate a comprehensive protease inhibitor cocktail specifically formulated for plant samples to prevent degradation during extraction .

Regarding blocking optimization, plant samples often exhibit higher background compared to animal tissues. Compare 5% BSA and 5% non-fat dry milk in TBST to determine which provides the optimal signal-to-noise ratio for your specific rice tissue. In cases of persistent high background, consider specialized plant blocking reagents or the addition of 0.1-0.3% Tween-20 to reduce non-specific hydrophobic interactions.

For antibody dilution and incubation conditions, start with a 1:1000 dilution of OsI_021818 Antibody in blocking buffer and incubate overnight at 4°C with gentle agitation. For challenging samples, a titration experiment (testing 1:500, 1:1000, 1:2000, and 1:5000 dilutions) can identify the optimal concentration that balances specific signal with minimal background .

Table 1: Troubleshooting Guide for Western Blotting with OsI_021818 Antibody

Control inclusion is essential for result interpretation. Always run positive controls (rice tissue known to express OsI_021818) and negative controls (when available, tissue from knockout/knockdown lines). For loading control, anti-actin or anti-tubulin antibodies validated for rice are recommended, with total protein staining (Ponceau S or SYPRO Ruby) serving as an alternative normalization method.

How can researchers validate the specificity of OsI_021818 Antibody in rice studies?

Validating antibody specificity is a critical step in ensuring experimental rigor and reproducibility in rice research. For OsI_021818 Antibody, a comprehensive validation approach combines multiple complementary methods to establish confidence in antibody performance.

The genetic validation approach represents the gold standard for specificity confirmation. When available, compare protein detection in wild-type rice with CRISPR-edited knockout lines or RNAi-mediated knockdown lines for the OsI_021818 gene. A corresponding reduction or absence of signal in genetic knockdown/knockout lines provides compelling evidence of antibody specificity. For laboratories with access to transformation facilities, transient overexpression of tagged OsI_021818 protein can serve as a positive control system .

For biochemical validation, perform peptide competition assays by pre-incubating the antibody with excess recombinant OsI_021818 protein or the specific immunizing peptide (when available from the manufacturer). If the antibody is specific, this pre-adsorption should abolish or significantly reduce signal in subsequent immunoassays. Additionally, immunoprecipitation followed by mass spectrometry analysis can confirm that the antibody is capturing the intended target protein from rice extracts.

Orthogonal method verification strengthens specificity claims by correlating protein detection with independent measurements. Compare protein levels detected by the antibody with mRNA expression levels measured by RT-qPCR across different rice tissues or treatment conditions. Strong correlation between protein and transcript levels provides supporting evidence for antibody specificity, though discrepancies may reflect post-transcriptional regulation rather than antibody problems.

Cross-reactivity assessment across species provides valuable information about epitope conservation. Test the antibody on protein extracts from related rice species and subspecies (O. sativa japonica, O. glaberrima, wild relatives) to establish the taxonomic range of reactivity. Compare observed cross-reactivity patterns with sequence conservation of the OsI_021818 protein across these species to determine if reactivity aligns with evolutionary relationships.

For publication-quality research, document all validation steps methodically, including positive and negative controls, and present these data alongside experimental results to establish confidence in the specificity of OsI_021818 Antibody detection.

What considerations should researchers take when adapting OsI_021818 Antibody for immunolocalization studies?

While OsI_021818 Antibody is primarily validated for ELISA and Western Blotting applications, researchers may adapt it for immunolocalization studies with rice tissues by addressing the unique challenges of plant cell architecture and autofluorescence . The following protocol considerations are essential for successful adaptation.

Tissue fixation and processing require special attention in rice samples. For paraffin embedding, fix fresh rice tissues in 4% paraformaldehyde in PBS (pH 7.4) for 12-16 hours at 4°C. The high silica content in rice tissues may necessitate additional softening steps; consider incorporating 0.5% Triton X-100 in the fixative to improve penetration. For cryosectioning approaches, infiltrate tissues with 30% sucrose solution before embedding in OCT compound to preserve antigenic sites and tissue architecture.

Antigen retrieval is particularly critical for plant tissues due to extensive cross-linking during fixation. Heat-induced epitope retrieval using 10mM sodium citrate buffer (pH 6.0) at 95°C for 20-25 minutes typically yields good results. For recalcitrant tissues, test enzymatic retrieval with proteinase K (1-5 μg/mL) for 10-15 minutes at 37°C, but monitor closely to prevent over-digestion and tissue damage.

Plant-specific autofluorescence management is essential for fluorescent detection methods. Rice tissues contain chlorophyll, phenolic compounds, and cell wall components that autofluoresce across multiple channels. Pre-treatment with 0.1% Sudan Black B in 70% ethanol for 20 minutes significantly reduces autofluorescence. For brightfield applications using HRP-coupled detection, endogenous peroxidase activity must be quenched with 3% hydrogen peroxide in methanol for 30 minutes prior to blocking.

Table 2: Recommended Protocol for Immunofluorescence with OsI_021818 Antibody

Controls are absolutely essential in immunolocalization studies. Include secondary-only controls to assess non-specific binding of the detection system and isotype controls (normal rabbit IgG at the same concentration) to evaluate background from the primary antibody host species. When possible, include genetic controls (tissue from plants with altered expression of OsI_021818) as the most stringent specificity control.

How can OsI_021818 Antibody be employed in rice stress response research?

OsI_021818 Antibody can serve as a powerful tool for investigating protein-level changes in rice stress response pathways, providing insights that transcriptional analyses alone cannot reveal . A comprehensive experimental approach integrates multiple stress conditions with temporal and spatial protein expression analysis.

For abiotic stress experimental design, implement a time-course analysis across multiple stress intensities. For drought stress, monitor OsI_021818 protein levels at defined soil moisture contents (e.g., 80%, 60%, 40%, 20% field capacity) across a time series (0, 6, 12, 24, 48, 72 hours after stress initiation). For salt stress, apply NaCl gradient treatments (50, 100, 150, 200 mM) and collect both root and shoot tissues to capture tissue-specific responses. Heat and cold stress experiments should include both stress exposure and recovery phases to identify potential roles in stress adaptation.

When designing biotic stress experiments, consider controlled inoculations with major rice pathogens such as Magnaporthe oryzae (rice blast) or Xanthomonas oryzae (bacterial blight). Sample collection should target key infection time points corresponding to pathogen recognition, defense activation, and disease progression phases. Include mock-inoculated controls sampled at identical time points to account for circadian or developmental regulation.

Table 3: Recommended Sampling Strategy for Stress Response Studies

For protein localization studies, compare subcellular fractionation results between control and stressed plants to detect potential stress-induced translocation of OsI_021818 protein. Western blot analysis of nuclear, cytoplasmic, membrane, and organellar fractions can reveal compartment-specific accumulation or depletion patterns. Complement biochemical fractionation with immunolocalization in fixed tissues to visualize in situ changes in protein distribution.

Post-translational modification analysis can uncover regulatory mechanisms. Examine migration patterns on Western blots for potential stress-induced band shifts indicative of phosphorylation, ubiquitination, or other modifications. For suspected phosphorylation, compare migration before and after treatment with lambda phosphatase. Additionally, co-immunoprecipitation experiments using OsI_021818 Antibody can identify stress-specific protein interaction partners that may regulate its function or localization.

For comprehensive interpretation, integrate protein-level data with transcriptomic analysis (RNA-seq or qRT-PCR) to distinguish between transcriptional and post-transcriptional regulation mechanisms. Correlation of protein dynamics with physiological measurements (e.g., photosynthetic rate, ROS accumulation, membrane integrity) can establish functional relationships between OsI_021818 and stress tolerance phenotypes.

What methods can researchers use to study post-translational modifications of OsI_021818 protein?

Post-translational modifications (PTMs) of OsI_021818 protein may play crucial roles in regulating its activity, localization, and interactions in response to developmental or environmental cues. Studying these modifications requires specialized approaches that can be implemented using OsI_021818 Antibody .

For phosphorylation analysis, which is one of the most common regulatory PTMs, begin with mobility shift detection. Comparative Western blotting of protein extracts before and after treatment with lambda phosphatase can reveal phosphorylation-dependent band shifts. Prepare replicate samples where half are incubated with active phosphatase and half with heat-inactivated enzyme as a control. Additionally, Phos-tag™ SDS-PAGE incorporates phosphate-binding molecules into acrylamide gels, causing phosphorylated proteins to migrate more slowly and creating greater separation between phosphorylated and non-phosphorylated forms.

For enrichment and identification of phosphorylated forms, perform immunoprecipitation using OsI_021818 Antibody followed by Western blotting with phospho-specific stains (e.g., ProQ Diamond) or anti-phospho-amino acid antibodies (anti-phosphoserine, anti-phosphothreonine, or anti-phosphotyrosine). For detailed phosphosite mapping, immunoprecipitated protein can be analyzed by mass spectrometry, ideally using a combination of collision-induced dissociation (CID) and electron transfer dissociation (ETD) fragmentation methods to maximize phosphopeptide identification.

Table 4: Analytical Approaches for Detecting Different PTMs on OsI_021818 Protein

For studying PTM dynamics under stress conditions, compare modification patterns across stress treatments and time points. Prepare rice plants under controlled conditions, apply specific stresses (drought, salt, temperature, pathogen), and harvest tissues at defined intervals. Process all samples in parallel, ensuring consistent extraction conditions with appropriate phosphatase/protease inhibitors to preserve in vivo modification states. Analyze by Western blotting and observe changes in band patterns or reactivity with PTM-specific reagents.

To correlate PTMs with protein function, combine PTM detection with subcellular localization studies. Compare the distribution of modified and unmodified forms across cellular compartments using fractination followed by Western blotting. Additionally, test whether PTM-mimicking mutations (e.g., serine to aspartate for phosphomimetic) alter protein localization, stability, or interaction patterns in transient expression systems.

For definitive site identification, mass spectrometry remains the gold standard. Immunoprecipitate OsI_021818 protein from rice tissues, perform in-gel or in-solution digestion, and analyze by LC-MS/MS. For low-abundance modifications, consider enrichment strategies specific to the PTM of interest prior to MS analysis, such as titanium dioxide enrichment for phosphopeptides or lectin affinity for glycopeptides.

What approaches can be used to study protein-protein interactions involving OsI_021818?

Investigating protein-protein interactions of OsI_021818 can provide crucial insights into its functional role in rice biology. OsI_021818 Antibody can be leveraged in several complementary approaches to identify and characterize interaction partners .

Co-immunoprecipitation (Co-IP) represents the most direct application of OsI_021818 Antibody for interaction studies. For standard Co-IP, prepare rice tissue lysates under non-denaturing conditions using a buffer containing 50 mM Tris-HCl (pH 7.5), 150 mM NaCl, 1% NP-40, and protease inhibitors. Pre-clear the lysate with Protein A/G beads to reduce non-specific binding, then incubate with OsI_021818 Antibody overnight at 4°C. After washing to remove unbound proteins, analyze the immunoprecipitated complex by Western blotting with antibodies against suspected interaction partners or by mass spectrometry for unbiased discovery. Include appropriate controls such as non-specific IgG and input samples to validate specific interactions.

For reciprocal validation of interactions, perform reverse Co-IP using antibodies against identified partner proteins, then probe for OsI_021818 in the immunoprecipitated complexes. This bidirectional confirmation significantly strengthens evidence for genuine interactions. When investigating interactions in specific subcellular compartments, perform fractionation before immunoprecipitation to enrich for compartment-specific interactions and reduce false positives from proteins that do not colocalize in vivo.

Table 5: Comparison of Methods for Studying OsI_021818 Protein Interactions

For identifying stimulus-dependent interactions, perform Co-IP experiments under different conditions (e.g., hormone treatment, stress exposure) to detect condition-specific changes in the interactome. Prepare replicate samples from plants grown under control and treatment conditions, perform parallel immunoprecipitations, and compare the resulting interaction profiles by differential proteomics. This approach can reveal how OsI_021818 interaction networks remodel in response to environmental or developmental signals.

For spatial analysis of protein interactions, consider bimolecular fluorescence complementation (BiFC) by creating fusion constructs of OsI_021818 and its suspected interaction partners with complementary fragments of a fluorescent protein (e.g., split YFP). Co-express these constructs in rice protoplasts or by transient transformation of rice tissues, then visualize fluorescence reconstitution by confocal microscopy. Include appropriate negative controls (non-interacting protein pairs) to validate the specificity of observed signals.

To characterize the dynamics of interactions, Förster resonance energy transfer (FRET) approaches can be employed using fluorescently tagged proteins. While technically challenging, FRET provides real-time information about protein association and dissociation in living cells. For protein array-based approaches, recombinant OsI_021818 protein can be used to probe rice protein arrays to identify direct binary interactions in a high-throughput manner.

How can researchers optimize OsI_021818 Antibody for chromatin immunoprecipitation studies?

While OsI_021818 Antibody is not explicitly validated for chromatin immunoprecipitation (ChIP), researchers can adapt it for this application if investigating potential DNA-binding or chromatin-associated functions of OsI_021818 protein . Successful ChIP optimization requires addressing several critical parameters.

First, evaluate antibody suitability for ChIP by confirming its ability to recognize native (non-denatured) OsI_021818 protein in solution. Perform an immunoprecipitation under non-denaturing conditions followed by Western blotting to verify that the antibody can effectively capture the native protein. For certain polyclonal antibodies, only a subset of the antibody population may recognize native epitopes, potentially requiring higher concentrations for ChIP than for Western blotting.

For crosslinking optimization, standard formaldehyde fixation protocols may require adjustment for plant tissues. Begin with 1% formaldehyde for 10 minutes at room temperature under vacuum infiltration to ensure proper fixation of rice tissues. Test multiple fixation times (5, 10, 15 minutes) to determine the optimal balance between sufficient crosslinking and epitope preservation. For dual crosslinking approaches, consider sequential treatment with disuccinimidyl glutarate (DSG, 2 mM for 30 minutes) followed by formaldehyde to stabilize protein-protein interactions before capturing protein-DNA complexes.

Table 6: Optimization Parameters for ChIP with OsI_021818 Antibody