SPCC895.08c Antibody

Antibody Specificity and Characteristics

Q: What is the SPCC895.08c protein targeted by this antibody?

A: SPCC895.08c is a protein encoded by the SPCC895.08c gene in Schizosaccharomyces pombe (strain 972 / ATCC 24843), commonly known as fission yeast. The antibody specifically recognizes epitopes of this protein with UniProt accession number O94535. The antibody is generated using a recombinant SPCC895.08c protein as the immunogen, ensuring specificity for this target in experimental applications .

Q: What are the storage requirements for maintaining SPCC895.08c antibody activity?

A: For optimal preservation of activity, SPCC895.08c antibody should be stored at -20°C or -80°C upon receipt. The antibody is supplied in a storage buffer containing 50% glycerol, 0.01M PBS (pH 7.4), and 0.03% Proclin 300 as a preservative. It's important to avoid repeated freeze-thaw cycles as these can compromise antibody activity. For research purposes, aliquoting the antibody before freezing is recommended to minimize exposure to temperature fluctuations .

Q: How is the SPCC895.08c antibody purified for research applications?

A: The SPCC895.08c antibody undergoes antigen affinity purification, a technique that selectively isolates antibodies with specificity for the target protein. This purification method enhances the specificity of the antibody by removing non-specific antibodies from the polyclonal mixture, resulting in a reagent with greater target specificity for research applications. The process typically involves immobilizing the recombinant SPCC895.08c protein on a solid support and isolating antibodies that bind specifically to this target .

Western Blot Methodology

Q: What are the optimal conditions for using SPCC895.08c antibody in Western blot experiments with yeast samples?

A: For Western blot applications with yeast samples, researchers should first grow Schizosaccharomyces pombe strains exponentially in appropriate media such as PMG media while maintaining OD595 below 0.4. Cell lysis should be performed using mechanical disruption methods such as a bead beater (e.g., FastPrep 120), followed by boiling in sample buffer and clarification by centrifugation. For the Western blot itself, the recommended antibody dilution should be optimized but typically ranges from 1:1000 to 1:5000. Detection can be accomplished using standard chemiluminescence methods with an appropriate secondary antibody against rabbit IgG .

Q: How should sample preparation be optimized when using SPCC895.08c antibody for detecting proteins in yeast lysates?

A: Optimal sample preparation for detecting proteins in yeast lysates using SPCC895.08c antibody involves several critical steps. First, ensure cells are harvested during exponential growth phase. For cell lysis, mechanical disruption using glass beads is recommended for yeast cells due to their rigid cell walls. Add protease inhibitors to prevent protein degradation during lysis. Sample denaturation should be performed at 95-100°C for 5 minutes in Laemmli sample buffer. For quantitative analysis, protein concentration should be normalized across samples using a reliable protein assay method such as Bradford or BCA. Typically, 20-40 μg of total protein per lane provides adequate sensitivity for detection of most yeast proteins .

ELISA Applications

Q: What protocol modifications are necessary when using SPCC895.08c antibody in ELISA compared to Western blotting?

A: When adapting SPCC895.08c antibody from Western blot to ELISA applications, several protocol modifications are necessary. For indirect ELISA, coat plates with purified target protein or yeast lysate containing SPCC895.08c protein at 1-10 μg/ml in carbonate buffer (pH 9.6) overnight at 4°C. Block with 3-5% BSA or non-fat milk in PBS-T for 1-2 hours at room temperature. The SPCC895.08c antibody should be used at optimized concentrations, typically starting at 1:500-1:2000 dilutions in blocking buffer. Incubation times may need extension to 2 hours at room temperature or overnight at 4°C to maximize sensitivity. Detection should be performed using an appropriate HRP-conjugated secondary antibody against rabbit IgG, followed by TMB or similar substrate. Thorough washing between steps (4-5 times with PBS-T) is essential to reduce background signal .

Cross-Reactivity and Specificity Analysis

Q: How can researchers confirm the specificity of SPCC895.08c antibody and rule out cross-reactivity with other yeast proteins?

A: Confirming specificity and ruling out cross-reactivity requires a multi-faceted approach. First, perform parallel Western blots using wildtype yeast and strains with SPCC895.08c gene deletion or knockdown. A specific antibody will show significantly reduced or absent signal in the deletion/knockdown strain. Second, conduct immunoprecipitation followed by mass spectrometry to identify all proteins captured by the antibody. Third, perform competitive binding assays with purified recombinant SPCC895.08c protein—pre-incubation with this protein should diminish antibody binding in subsequent assays if the antibody is specific. Fourth, test reactivity against related species to assess evolutionary conservation of the epitope. Finally, use epitope mapping to identify the specific binding regions and compare these sequences with other yeast proteins to predict potential cross-reactivity .

Q: What are the potential epitope regions of SPCC895.08c protein that this antibody recognizes?

A: As a polyclonal antibody raised against recombinant full-length SPCC895.08c protein, this reagent likely recognizes multiple epitopes throughout the protein sequence. While specific epitope mapping data is not provided in the available information, polyclonal antibodies typically bind to several accessible, immunogenic regions that are often hydrophilic, surface-exposed, and contain secondary structures such as beta-turns. To precisely determine the epitope regions recognized by this antibody, researchers would need to perform epitope mapping experiments using techniques such as peptide arrays, phage display, or targeted mutagenesis of the SPCC895.08c protein followed by binding assays. This information would be valuable for predicting potential cross-reactivity with related proteins and understanding antibody performance in different experimental contexts .

Experimental Troubleshooting

Q: What strategies can resolve weak or absent signals when using SPCC895.08c antibody in Western blots?

A: When encountering weak or absent signals with SPCC895.08c antibody in Western blots, implement a systematic troubleshooting approach. First, increase protein loading to 40-60 μg per lane to enhance detection sensitivity. Try reducing antibody dilution (e.g., from 1:2000 to 1:1000 or 1:500) and extending primary antibody incubation to overnight at 4°C. Optimize blocking conditions by testing different blocking agents (BSA vs. non-fat milk) and concentrations. Enhance protein extraction by using stronger lysis buffers containing SDS or urea, particularly important for membrane-associated proteins. Check transfer efficiency using Ponceau S staining of membranes. For low-abundance proteins, consider using enhanced chemiluminescence substrates with higher sensitivity or signal amplification systems. If necessary, enrich the target protein through immunoprecipitation before Western blotting. Finally, verify protein expression levels through RT-PCR to confirm the presence of the target gene transcript .

Q: How can researchers address high background issues when using SPCC895.08c antibody in immunological assays?

A: High background in immunological assays with SPCC895.08c antibody can be addressed through several specific interventions. Increase washing frequency and duration between antibody incubations, using PBS-T with 0.05-0.1% Tween-20 for Western blots or 0.05% Tween-20 for ELISA. Optimize blocking conditions by testing different blocking agents (5% non-fat milk, 3-5% BSA, or commercial blocking buffers) and extending blocking time to 2 hours at room temperature. Dilute antibodies in fresh blocking buffer and filter antibody dilutions through a 0.22 μm filter to remove any aggregates. Reduce antibody concentration or incubation time if oversaturation is suspected. For Western blots, pre-adsorb the antibody with yeast lysate from a strain lacking the target protein. Use higher stringency washing buffers containing increased salt concentration (up to 500 mM NaCl) to disrupt non-specific interactions. Finally, ensure all buffers are freshly prepared and free from contaminants that might promote non-specific binding .

Benchmarking Against Other Techniques

Q: How does the sensitivity of SPCC895.08c antibody-based detection compare with other protein detection methods in yeast research?

A: The sensitivity of SPCC895.08c antibody-based detection can be benchmarked against alternative protein detection methodologies using a systematic comparative analysis. Antibody-based detection typically offers sensitivity in the nanogram range for Western blotting, while mass spectrometry can detect proteins in the picogram range but requires more specialized equipment. Fluorescent protein tagging (e.g., GFP fusion) provides live-cell visualization but may affect protein function. RNA-based methods like RT-qPCR measure transcript levels rather than protein abundance and may not correlate perfectly with protein expression due to post-transcriptional regulation. For absolute quantification, researchers should generate a standard curve using purified recombinant SPCC895.08c protein at known concentrations detected by the antibody under identical conditions. This allows determination of the lower limit of detection (LLOD) and lower limit of quantification (LLOQ) specific to this antibody, providing benchmarks for experimental planning and data interpretation .

Q: What are the advantages of using a polyclonal SPCC895.08c antibody versus generating a monoclonal antibody for specific research applications?

Data Tables and Experimental Controls

Q: What essential controls should be included when validating SPCC895.08c antibody specificity in immunoblot experiments?

A: A comprehensive validation of SPCC895.08c antibody specificity requires multiple controls, as detailed in the following table:

These controls collectively establish the specificity, sensitivity, and reliability of the SPCC895.08c antibody in experimental applications .

Combining with Other Techniques

Q: How can SPCC895.08c antibody be integrated with genomic techniques for comprehensive protein function studies?

A: Integrating SPCC895.08c antibody with genomic techniques enables multi-dimensional analysis of protein function. Chromatin immunoprecipitation followed by sequencing (ChIP-seq) can be performed if SPCC895.08c has DNA-binding properties, revealing genome-wide binding sites. For protein interaction networks, combine immunoprecipitation with mass spectrometry (IP-MS) to identify binding partners. Correlate protein expression data from immunoblots with transcriptome analyses (RNA-seq) to understand transcriptional and post-transcriptional regulation. For functional genomics, perform antibody-based protein detection in strains with systematic gene deletions or mutations to identify genetic interactions affecting SPCC895.08c expression or localization. Validate computational predictions of protein function using the antibody to confirm expression, localization, and interactions in experimental models. This integrated approach leverages the specificity of the antibody while placing protein-level data in a broader genomic context, providing a more complete understanding of SPCC895.08c function within cellular networks .

Q: What methodological approaches can be used to study post-translational modifications of SPCC895.08c protein using this antibody?

A: Studying post-translational modifications (PTMs) of SPCC895.08c protein requires specialized methodological approaches. First, researchers should perform immunoprecipitation using the SPCC895.08c antibody followed by mass spectrometry to identify potential PTMs comprehensively. For specific PTMs of interest, combine the SPCC895.08c antibody with modification-specific antibodies (e.g., anti-phospho, anti-ubiquitin) in sequential immunoprecipitation or co-detection experiments. Two-dimensional gel electrophoresis followed by Western blotting can separate protein isoforms with different modifications before antibody detection. For phosphorylation studies, treat samples with lambda phosphatase and compare with untreated controls to identify phosphorylation-dependent mobility shifts. Use targeted genetic approaches by mutating potential modification sites and assess effects using the antibody. For temporal dynamics, perform time-course experiments with the antibody after stimulus application. Finally, combine with proximity ligation assays to visualize specific modifications in situ with single-molecule resolution .

Specialized Research Contexts

Q: How can SPCC895.08c antibody be utilized in studying protein-protein interactions in Schizosaccharomyces pombe?

A: SPCC895.08c antibody can be instrumental in elucidating protein-protein interactions through multiple methodological approaches. Co-immunoprecipitation (Co-IP) serves as the foundation—lyse cells under non-denaturing conditions, immunoprecipitate with the SPCC895.08c antibody, and identify binding partners by immunoblotting or mass spectrometry. For validation, perform reciprocal Co-IPs using antibodies against suspected interaction partners. Proximity-dependent labeling can be implemented by fusing enzymes like BioID or APEX2 to SPCC895.08c, followed by detection of biotinylated proteins using streptavidin and confirmation with the antibody. For in situ visualization, apply proximity ligation assays combining SPCC895.08c antibody with antibodies against candidate interactors to generate fluorescent signals where proteins are in close proximity. Cross-linking followed by immunoprecipitation (CLIP) can capture transient interactions by stabilizing complexes before antibody-based isolation. For interaction dynamics, compare protein complexes isolated by the antibody under different physiological conditions or cell cycle stages. Finally, confirm biological relevance by genetic manipulation of interaction partners and subsequent analysis of SPCC895.08c localization, abundance, or modification state using the antibody .

Q: What considerations are important when using SPCC895.08c antibody for studying protein localization through immunofluorescence microscopy?

A: Successful immunofluorescence microscopy with SPCC895.08c antibody requires several technical considerations. For yeast cell preparation, optimize fixation methods—4% paraformaldehyde preserves most epitopes while maintaining cellular architecture, but test methanol fixation if paraformaldehyde proves insufficient. Cell wall digestion with enzymatic treatment (such as zymolyase or lyticase) is critical for antibody penetration in yeast cells. Perform antigen retrieval if necessary, particularly for heavily cross-linked samples. Thoroughly optimize antibody concentration through titration experiments, typically starting at 1:100-1:500 dilutions. Include appropriate controls, including secondary-only controls and SPCC895.08c deletion strains. Counterstain with DAPI for nuclear visualization and consider co-staining with antibodies against organelle markers to determine precise subcellular localization. For signal amplification in cases of low-abundance proteins, implement tyramide signal amplification. Verify specificity of localization patterns using complementary approaches such as fluorescent protein tagging. Finally, quantify signal distribution using appropriate image analysis software with statistical validation across multiple cells and independent experiments .

Emerging Applications

Q: How might SPCC895.08c antibody be adapted for high-throughput proteomic studies in yeast?

A: Adapting SPCC895.08c antibody for high-throughput proteomic studies requires several methodological innovations. For reverse phase protein arrays (RPPA), immobilize hundreds of different yeast samples on nitrocellulose-coated slides and probe with the SPCC895.08c antibody, enabling quantitative protein expression analysis across large sample sets. Develop automated immunoprecipitation workflows using magnetic bead systems in 96-well formats to isolate SPCC895.08c and its complexes from multiple experimental conditions simultaneously. Adapt the antibody for multiplexed detection systems using fluorescent labels with distinct spectral properties for co-detection with other proteins of interest. Implement microfluidic immunoassays that require minimal sample volumes while providing quantitative data on protein expression. For systems biology approaches, combine with mass cytometry (CyTOF) by metal-conjugating the antibody for single-cell analysis in heterogeneous populations. Standardize detection conditions for cross-platform comparability, using recombinant protein standards to generate absolute quantification metrics. Finally, integrate with machine learning algorithms to identify patterns in SPCC895.08c expression or modification across large datasets, correlating with genetic or environmental variables .

Q: What methodological approaches would be needed to develop SPCC895.08c antibody derivatives for super-resolution microscopy applications?

A: Developing SPCC895.08c antibody derivatives for super-resolution microscopy requires specific methodological refinements. First, fragment the antibody to create smaller Fab fragments that minimize the distance between fluorophore and target, crucial for techniques like STORM or PALM where spatial precision is paramount. Conjugate the antibody directly with photoswitchable fluorophores such as Alexa Fluor 647 or photoactivatable GFP derivatives at optimal dye-to-protein ratios (typically 1-2 fluorophores per antibody molecule) to prevent self-quenching. For STED microscopy, conjugate with photostable dyes resistant to high-intensity depletion lasers. Rigorously validate specificity of conjugated antibodies in comparison to unconjugated versions using conventional immunofluorescence. Test different fixation protocols to identify methods that preserve nanoscale structures while maintaining epitope accessibility. Implement robust drift correction using fiducial markers for long acquisition times. For multicolor super-resolution, carefully select fluorophore combinations with minimal spectral overlap. Finally, optimize buffer conditions containing oxygen scavenging systems and thiol compounds to enhance photoswitching behavior of conjugated fluorophores, particularly for techniques like dSTORM that require controlled fluorophore blinking .