Os08g0192900 Antibody

What is Os08g0192900 and what protein does it encode?

Os08g0192900 is a gene in rice (Oryza sativa) that encodes Nucleolin 1 (also known as Protein NUCLEOLIN LIKE 1). According to the available information, this protein is 572 amino acids in length and is classified as "Hard" in AbClassTM, indicating potential challenges in antibody development . Nucleolin is a conserved protein involved in several cellular processes including ribosome biogenesis, chromatin remodeling, and RNA metabolism. The full sequence of the protein has been characterized and is available in databases with cross-reference NP_001061178.1 .

What epitope options are available for Os08g0192900 antibodies and how should researchers choose between them?

There are multiple epitope options available for Os08g0192900 antibodies, targeting different regions of the protein:

The choice between these options should be based on your experimental goals. N-terminal antibodies are often preferred for distinguishing between close homologs, while C-terminal antibodies may detect multiple splice variants. Each combination consists of antibodies against multiple synthetic peptides, providing broader epitope recognition .

How should I optimize Western blot protocols when using Os08g0192900 antibodies?

Optimizing Western blot protocols for Os08g0192900 antibodies requires careful consideration of several parameters:

• Sample preparation:

  • Include protease inhibitors to prevent Nucleolin degradation

  • Use extraction buffers containing phosphatase inhibitors if studying post-translational modifications

  • Maintain consistent protein loading (25-40 μg per lane)

• Gel selection and transfer:

  • Use 8-10% gels for optimal separation of the 572 aa protein

  • Extended transfer times (90-120 minutes) at lower voltage may improve transfer efficiency

  • PVDF membranes typically provide better results for nucleolar proteins

• Antibody optimization:

  • Start with the manufacturer's recommended dilution (typically 1:1000)

  • Based on the available ELISA titer information (10,000), detection sensitivity should be approximately 1 ng of target protein

  • Use 5% BSA in TBST as blocking agent to reduce background

  • Consider overnight primary antibody incubation at 4°C

• Controls:

  • Include positive control (rice tissue lysate)

  • Consider peptide competition controls to confirm specificity

  • Use appropriate loading controls (e.g., actin, GAPDH)

Following these guidelines should yield clear detection of Os08g0192900-encoded Nucleolin protein with minimal background.

What are the recommended protocols for immunoprecipitation using Os08g0192900 antibodies?

For successful immunoprecipitation of Nucleolin 1 using Os08g0192900 antibodies, follow this optimized protocol:

• Cell/tissue lysis:

  • Harvest fresh tissue and grind in liquid nitrogen

  • Lyse in buffer containing 50 mM Tris-HCl (pH 7.5), 150 mM NaCl, 1% NP-40, 0.5% sodium deoxycholate, and protease inhibitor cocktail

  • Sonicate briefly (3 × 10s) on ice to shear chromatin

  • Clear lysate by centrifugation (14,000 × g, 15 min, 4°C)

• Immunoprecipitation:

  • Pre-clear lysate with 30 μl Protein A/G beads for 1 hour at 4°C

  • Incubate 1 mg pre-cleared lysate with 2-5 μg antibody overnight at 4°C with gentle rotation

  • Add 40 μl Protein A/G beads and incubate for 3 hours at 4°C

  • Wash beads 4× with lysis buffer and 1× with PBS

  • Elute by boiling in SDS sample buffer

• Verification:

  • Analyze 5-10% of input, unbound fraction, and IP samples

  • Probe Western blot with a different Os08g0192900 antibody if available

  • Consider mass spectrometry analysis for unbiased identification

This protocol should be optimized based on your specific experimental conditions and tissue type.

How can I validate the specificity of Os08g0192900 antibodies?

Validating antibody specificity is crucial for reliable research results. For Os08g0192900 antibodies, implement the following validation strategy:

• Genetic validation:

  • Test antibody in CRISPR knockout or RNAi knockdown lines

  • Compare signal intensity with expression level in overexpression lines

  • Assess correlation between protein and mRNA levels

• Biochemical validation:

  • Perform peptide competition assays using the immunizing peptides

  • Test multiple antibodies targeting different epitopes (X-Q6Z1C0-N, X-Q6Z1C0-C, X-Q6Z1C0-M)

  • Analyze molecular weight consistency with predicted size (572 aa should yield a band of ~63-65 kDa)

• Cross-reactivity assessment:

  • Test reactivity against recombinant proteins from related species

  • Examine species specificity using evolutionary related plant samples

  • Analyze potential cross-reactivity with other nucleolin family members

• Application-specific validation:

  • For immunofluorescence: Compare with GFP-tagged Nucleolin localization

  • For ChIP: Include IgG controls and known target sites

  • For IP-MS: Verify enrichment of known interactors

Systematic validation across multiple approaches provides the highest confidence in antibody specificity.

What are common sources of inconsistent results when using Os08g0192900 antibodies and how can they be addressed?

Inconsistent results with Os08g0192900 antibodies can stem from several sources:

Systematic troubleshooting by changing one variable at a time will help identify and resolve inconsistency sources.

How can Os08g0192900 antibodies be utilized in chromatin immunoprecipitation (ChIP) studies?

Chromatin immunoprecipitation with Os08g0192900 antibodies allows investigation of Nucleolin's interaction with chromatin:

• Crosslinking optimization:

  • Start with 1% formaldehyde for 10 minutes at room temperature

  • For stronger interactions, consider dual crosslinking with DSG (2 mM, 45 min) followed by formaldehyde

  • Quench with 125 mM glycine for 5 minutes

• Chromatin preparation:

  • Isolate nuclei using a plant nuclei isolation buffer

  • Sonicate to generate 200-500 bp fragments

  • Verify fragmentation by agarose gel electrophoresis

• Immunoprecipitation:

  • Pre-clear chromatin with protein A/G beads

  • Use 3-5 μg of Os08g0192900 antibody per 25 μg of chromatin

  • Include IgG control and input samples (10%)

  • Incubate overnight at 4°C with rotation

• Washing and elution:

  • Use increasingly stringent wash buffers to reduce background

  • Elute DNA-protein complexes with elution buffer containing 1% SDS

  • Reverse crosslinks (65°C overnight)

  • Treat with RNase A and Proteinase K

• Analysis:

  • Quantify enrichment by qPCR targeting suspected binding regions

  • For genome-wide analysis, perform ChIP-seq

  • Analyze data with appropriate peak-calling algorithms

This protocol can be used to investigate Nucleolin's role in chromatin organization and gene expression regulation in rice.

How can RNA immunoprecipitation (RIP) be performed using Os08g0192900 antibodies?

RNA immunoprecipitation enables the study of RNA-Nucleolin interactions:

• Sample preparation:

  • Harvest tissue and cross-link RNA-protein interactions with 0.1-0.5% formaldehyde (optional)

  • Homogenize tissue in lysis buffer containing RNase inhibitors

  • Clear lysate by centrifugation (14,000 × g, 10 min, 4°C)

• Immunoprecipitation:

  • Pre-clear lysate with protein A/G beads

  • Incubate 1 mg of lysate with 5 μg Os08g0192900 antibody overnight at 4°C

  • Add protein A/G beads and incubate for 3 hours at 4°C

  • Wash beads 5× with wash buffer containing RNase inhibitors

• RNA isolation and analysis:

  • Extract RNA from beads using TRIzol or commercial kits

  • Treat with DNase I to remove genomic DNA contamination

  • Perform RT-qPCR for candidate RNAs or RNA-seq for global analysis

  • Compare enrichment to IgG control and input RNA

• Validation experiments:

  • Perform reverse experiment with tagged RNA

  • Use RNA-binding protein mutants as controls

  • Confirm direct binding using in vitro binding assays

This approach can identify RNA targets of Nucleolin and provide insights into its role in RNA metabolism and ribosome biogenesis in rice.

How do antibodies against Os08g0192900 compare with antibodies against nucleolin from other plant species?

Comparing Os08g0192900 antibodies with other plant nucleolin antibodies reveals important considerations:

Cross-reactivity depends on the epitope targeted by the antibody. The N-terminal region shows greater sequence variation between species, while the RNA-binding domains are more conserved. When using antibodies across species:

• Validate specificity in each species with Western blots

• Compare molecular weights and expression patterns

• Consider using conserved region antibodies for cross-species studies

• For highly specific detection, use antibodies targeting unique regions

The availability of three different regional antibodies for Os08g0192900 (N-terminal, C-terminal, and middle region) provides flexibility for different experimental needs and cross-species comparisons.

How can Os08g0192900 antibodies be integrated into multi-omics studies of rice stress responses?

Integrating Os08g0192900 antibodies into multi-omics studies provides comprehensive insights into Nucleolin's role in stress responses:

• Proteomics integration:

  • Immunoprecipitation followed by mass spectrometry (IP-MS)

  • Identifies stress-responsive protein interactions

  • Compare interaction networks under normal vs. stress conditions

  • Analyze post-translational modifications using modification-specific antibodies

• Transcriptomics integration:

  • RNA immunoprecipitation followed by sequencing (RIP-seq)

  • Identifies direct RNA targets under stress conditions

  • Compare with total RNA-seq to determine RNA subsets regulated by Nucleolin

  • Correlate with ChIP-seq data to link transcriptional and post-transcriptional regulation

• Epigenomics integration:

  • ChIP-seq to map Nucleolin binding sites genome-wide

  • Correlate with histone modification patterns

  • Analyze stress-induced changes in binding profiles

  • Compare with DNA methylation data

• Systems biology approaches:

  • Network analysis of protein-protein and protein-RNA interactions

  • Integration with metabolomic data to link to physiological responses

  • Comparative analysis across different stresses

  • Development of predictive models for Nucleolin function

This multi-layered approach reveals Nucleolin's dynamic role in coordinating stress responses at multiple regulatory levels, from chromatin organization to RNA processing and protein interactions.

How can proximity labeling be combined with Os08g0192900 antibodies to study protein interaction networks?

Proximity labeling with Os08g0192900 antibodies offers powerful insights into Nucleolin's interaction networks:

• BioID approach:

  • Create fusion proteins between Nucleolin and BioID2 (a promiscuous biotin ligase)

  • Express in rice cells/protoplasts using appropriate vectors

  • Activate with biotin for 6-24 hours to label proximal proteins

  • Purify biotinylated proteins using streptavidin beads

  • Identify by mass spectrometry

  • Validate key interactions using Os08g0192900 antibodies in co-IP experiments

• APEX2 approach (faster labeling):

  • Generate Nucleolin-APEX2 fusion proteins

  • Treat cells with biotin-phenol and H₂O₂ for rapid (1 minute) labeling

  • Purify and identify as above

  • Compare interaction networks under different conditions

  • Validate with traditional immunoprecipitation

• Split-BioID approach:

  • Fuse Nucleolin with one half of the split-BioID system

  • Fuse suspected interaction partners with the complementary half

  • Reconstitution of BioID activity confirms direct interaction

  • Label and identify additional proteins in the complex

• Validation and analysis:

  • Use Os08g0192900 antibodies to confirm expression of fusion proteins

  • Perform immunofluorescence to verify subcellular localization

  • Compare labeled proteins with known Nucleolin interactors

  • Perform network analysis to identify functional protein clusters

This approach provides spatial and temporal resolution of Nucleolin's interaction networks that cannot be achieved with traditional immunoprecipitation methods.

What considerations should researchers make when designing CRISPR/Cas9 experiments to validate Os08g0192900 antibody specificity?

Designing CRISPR/Cas9 experiments for antibody validation requires careful planning:

• Guide RNA design:

  • Design multiple sgRNAs targeting early exons of Os08g0192900

  • Avoid sgRNAs with potential off-target effects in homologous genes

  • Consider targeting regions corresponding to antibody epitopes

  • Use rice-optimized CRISPR/Cas9 systems for higher efficiency

• Validation strategy:

  • Create complete knockout lines (most stringent validation)

  • Generate epitope-specific deletions (maintains protein function)

  • Develop C-terminal tagged lines (for comparing antibody detection with tag detection)

• Screening approaches:

  • PCR and sequencing to confirm mutations

  • RT-qPCR to verify transcript changes

  • Western blotting with Os08g0192900 antibodies to confirm protein loss

  • Immunofluorescence to assess signal specificity

• Controls and considerations:

  • Include wild-type controls from the same genetic background

  • Generate heterozygous and homozygous mutants for dosage comparison

  • Consider potential lethality of complete knockouts

  • Evaluate phenotypic consequences that might affect interpretation

• Alternative approaches:

  • RNAi-mediated knockdown if CRISPR is unsuccessful

  • Overexpression of the target protein as complementary validation

  • Heterologous expression in systems lacking the target

CRISPR-generated knockout lines serve as the gold standard for antibody validation and provide valuable resources for functional studies of Nucleolin in rice.