SPBC23E6.01c Antibody

What is SPBC23E6.01c and what is its biological role?

SPBC23E6.01c is an uncharacterized RNA-binding protein in Schizosaccharomyces pombe (fission yeast). It is predicted to function as an mRNA processing factor, suggesting its involvement in post-transcriptional regulation pathways . The gene is also referred to by alternative names including C23E6.01c and SPBPJ758.01. While the precise biological function remains under investigation, RNA-binding proteins in S. pombe generally play crucial roles in gene expression regulation through processes such as splicing, transport, stability control, and translation of mRNAs.

What are the key specifications of commercially available SPBC23E6.01c antibodies?

The SPBC23E6.01c antibody is typically produced as a rabbit polyclonal IgG antibody generated against Schizosaccharomyces pombe (strain 972/24843). The antibody is purified through antigen-affinity chromatography to enhance specificity . According to available product information, the antibody demonstrates reactivity specifically against S. pombe and has been validated for applications including ELISA and Western blot techniques . When selecting an antibody for your experiments, verify that the reagent has been tested in your specific application of interest and against your particular S. pombe strain.

What are the recommended applications for SPBC23E6.01c antibody?

Based on available validation data, SPBC23E6.01c antibody is suitable for:

• Western blotting (WB): For detection and quantification of the protein in cell lysates

• Enzyme-linked immunosorbent assay (ELISA): For quantitative measurement in solution

When using this antibody for Western blotting, researchers should ensure proper identification of the antigen using appropriate molecular weight markers and controls. The antibody may potentially be adaptable to other applications such as immunoprecipitation or immunofluorescence, though these would require additional validation by the researcher.

How should I store and handle SPBC23E6.01c antibody to maintain optimal activity?

While product-specific storage conditions should always be consulted, polyclonal antibodies targeting yeast proteins typically require:

• Long-term storage at -20°C to -80°C in small aliquots to prevent freeze-thaw cycles

• Short-term storage (1-2 weeks) at 4°C

• Avoidance of repeated freeze-thaw cycles that can lead to antibody denaturation and loss of activity

• Protection from light, particularly if the antibody is conjugated to a fluorophore

• Addition of sodium azide (0.02-0.05%) as a preservative for refrigerated storage, though this should be diluted out in working solutions for live cell applications

Always centrifuge the antibody solution briefly before opening the tube to collect any protein that may have adhered to the container walls.

What is the optimal protocol for using SPBC23E6.01c antibody in Western blotting?

For optimal Western blot results with SPBC23E6.01c antibody:

• Sample preparation: Prepare S. pombe lysates using established methods such as the spheroblasting technique described for fission yeast in the literature . This involves enzymatic cell wall digestion followed by gentle lysis.

• Protein separation: Use standard SDS-PAGE with an appropriate percentage acrylamide gel based on the predicted molecular weight of SPBC23E6.01c.

• Transfer: Transfer proteins to a PVDF or nitrocellulose membrane using standard wet or semi-dry transfer methods.

• Blocking: Block non-specific binding sites with 5% non-fat dry milk or BSA in TBS-T for 1 hour at room temperature.

• Primary antibody incubation: Dilute SPBC23E6.01c antibody between 1:2500 to 1:10000 in blocking buffer (optimization may be required for your specific experiment) . Incubate overnight at 4°C with gentle agitation.

• Washing: Wash 3-5 times with TBS-T, 5-10 minutes each.

• Secondary antibody: Use an appropriate HRP-conjugated anti-rabbit secondary antibody (typically 1:5000 to 1:10000 dilution). Incubate for 1 hour at room temperature.

• Detection: Apply chemiluminescent substrate and capture signal using an imaging system.

Include appropriate positive and negative controls to validate specificity. A protein loading control (e.g., actin or tubulin) should be used for normalization.

How can I optimize SPBC23E6.01c antibody for immunofluorescence microscopy in S. pombe?

Though immunofluorescence is not explicitly listed among validated applications for this antibody, researchers can attempt optimization following these methodological steps:

• Cell preparation: Fix S. pombe cells with 3.7% formaldehyde for 30 minutes at room temperature.

• Cell wall digestion: Since the yeast cell wall impedes antibody penetration, enzymatic digestion is critical. Treat fixed cells with zymolyase or lyticase to create spheroplasts .

• Permeabilization: Permeabilize cell membranes with 0.1% Triton X-100 in PBS for 5 minutes.

• Blocking: Block with 5% BSA or normal goat serum in PBS for 60 minutes.

• Primary antibody: Start with a moderate dilution (1:100 to 1:500) of SPBC23E6.01c antibody in blocking solution. Incubate overnight at 4°C.

• Washing: Wash cells thoroughly 3-5 times with PBS.

• Secondary antibody: Apply fluorophore-conjugated anti-rabbit secondary antibody (1:500 to 1:1000) for 1 hour at room temperature in the dark.

• Nuclear counterstain: Optionally add DAPI to visualize nuclei.

• Mounting: Mount cells in anti-fade mounting medium.

Use cell wall integrity mutants as alternative models if penetration issues persist. Include a known nuclear or cytoplasmic marker to facilitate interpretation of SPBC23E6.01c localization.

What approaches are recommended for troubleshooting non-specific binding with SPBC23E6.01c antibody?

When facing non-specific binding issues:

• Increase blocking stringency: Extend blocking time to 2 hours or increase blocking agent concentration to 10%.

• Optimize antibody dilution: Test a dilution series (e.g., 1:1000, 1:2500, 1:5000, 1:10000) to identify the optimal concentration that maximizes specific signal while minimizing background.

• Add protein competitors: Incorporate 0.1-0.5% BSA or 5% normal serum from the same species as the secondary antibody into your antibody dilution buffer.

• Modify washing protocol: Increase washing duration or add 0.1-0.5% Tween-20 or 0.1-0.3M NaCl to the washing buffer to reduce non-specific ionic interactions.

• Pre-absorb antibody: Incubate the diluted antibody with a lysate from cells that do not express SPBC23E6.01c (if available) to remove antibodies that bind to other yeast proteins.

• Validate with controls: Include a knockout strain or RNA interference sample as a negative control to confirm specificity.

• Antigen peptide competition: Pre-incubate the antibody with an excess of the immunizing peptide to confirm that binding is specific.

Document systematic optimization steps and maintain consistent protocols once optimal conditions are established.

How can I use SPBC23E6.01c antibody for co-immunoprecipitation to identify protein interaction partners?

For co-immunoprecipitation (Co-IP) studies of SPBC23E6.01c:

• Lysate preparation:

  • Prepare S. pombe lysates under non-denaturing conditions to preserve protein-protein interactions

  • Consider crosslinking with formaldehyde (0.1-1%) prior to lysis to capture transient interactions

  • Use gentle detergents such as NP-40 (0.5-1%) or digitonin (0.5-1%)

• Pre-clearing: Incubate lysate with Protein A/G beads for 1 hour at 4°C to reduce non-specific binding.

• Antibody binding: Add SPBC23E6.01c antibody to pre-cleared lysate (typically 2-5 μg antibody per 1 mg protein) and incubate overnight at 4°C with gentle rotation.

• Immunoprecipitation: Add fresh Protein A/G beads and incubate for 2-4 hours at 4°C.

• Washing: Wash beads 4-6 times with lysis buffer containing reduced detergent.

• Elution: Elute bound proteins with SDS sample buffer or by competition with excess immunizing peptide.

• Analysis: Analyze by SDS-PAGE followed by:

  • Western blotting to detect specific suspected interaction partners

  • Silver staining for visualization of all co-precipitated proteins

  • Mass spectrometry for unbiased identification of the complete interactome

Include appropriate controls: IgG-only precipitation, lysate from cells with SPBC23E6.01c deleted or depleted, and reciprocal Co-IP with antibodies against suspected interaction partners.

What methodologies can be used to study SPBC23E6.01c expression changes during cell cycle progression?

To study cell cycle-dependent changes in SPBC23E6.01c expression:

• Cell synchronization approaches:

  • Temperature-sensitive cdc mutants can arrest cells at specific cell cycle phases

  • Nitrogen starvation followed by release into nitrogen-rich medium

  • Size selection by centrifugal elutriation

  • Chemical synchronization with hydroxyurea (S-phase arrest)

• Time-course sampling: Collect cells at defined intervals (15-30 minutes) following release from synchronization.

• Verification of synchrony: Monitor septation index or DNA content by flow cytometry to confirm cell cycle progression.

• Protein analysis: Process samples for Western blotting with SPBC23E6.01c antibody .

• RNA analysis: In parallel, perform RT-qPCR or RNA-seq to correlate protein levels with mRNA expression .

• Quantification: Use densitometry to quantify Western blot signals, normalizing to a loading control that doesn't vary during the cell cycle.

• Statistical analysis: Apply appropriate statistical tests to determine significance of observed changes across the cell cycle.

• Visualization: Create temporal expression profiles similar to those generated in MultiRNAflow package for better interpretation of expression dynamics .

Combine these protein-level analyses with microscopy using GFP-tagged SPBC23E6.01c to correlate expression changes with potential subcellular localization shifts during cell cycle progression.

How can I perform chromatin immunoprecipitation (ChIP) using SPBC23E6.01c antibody to identify DNA-binding sites?

If SPBC23E6.01c is predicted to interact with chromatin as an RNA-binding protein, ChIP can be performed using this methodological framework:

• Crosslinking: Fix S. pombe cells with 1% formaldehyde for 10-15 minutes at room temperature.

• Quenching: Add glycine to a final concentration of 125 mM and incubate for 5 minutes.

• Cell lysis: Prepare spheroplasts then lyse cells in appropriate buffer.

• Chromatin shearing: Sonicate lysate to generate DNA fragments of 200-500 bp. Verify fragment size by agarose gel electrophoresis.

• Pre-clearing: Incubate sheared chromatin with Protein A/G beads for 1 hour at 4°C.

• Immunoprecipitation: Add SPBC23E6.01c antibody to pre-cleared chromatin and incubate overnight at 4°C.

• Bead capture: Add Protein A/G beads and incubate for 2-3 hours at 4°C.

• Washing: Perform sequential washes with increasing stringency buffers.

• Elution and reverse crosslinking: Elute DNA-protein complexes and reverse crosslinks by heating at 65°C overnight.

• DNA purification: Digest proteins with proteinase K, extract DNA, and purify.

• Analysis:

  • qPCR for targeted analysis of suspected binding regions

  • ChIP-seq for genome-wide binding site identification

  • Integrate with RNA-seq data to correlate binding with gene expression changes

Critical controls include:

• Input chromatin (non-immunoprecipitated)

• IgG control immunoprecipitation

• Positive control using antibody against a well-characterized chromatin protein

• ChIP in cells where SPBC23E6.01c is depleted or deleted

How should I analyze and quantify Western blot data generated with SPBC23E6.01c antibody?

For rigorous quantification of Western blot data:

• Image acquisition:

  • Capture images using a dynamic range-appropriate system (digital imager recommended over film)

  • Ensure signals are within the linear range of detection and not saturated

  • Acquire multiple exposure times if uncertainty exists about signal linearity

• Densitometric analysis:

  • Use software such as ImageJ, Image Lab, or similar analytical tools

  • Define regions of interest (ROIs) consistently across all samples

  • Subtract local background signal from each band measurement

  • Normalize SPBC23E6.01c band intensity to appropriate loading control (e.g., actin, tubulin)

• Data normalization approaches:

  • Relative quantification: Express as fold change relative to control condition

  • Absolute quantification: Include calibration curve with recombinant protein if absolute values are needed

• Statistical analysis:

  • For multiple comparisons: ANOVA followed by appropriate post-hoc tests

  • For time course experiments: Consider repeated measures analysis

  • Present data as mean ± standard deviation/SEM with appropriate sample sizes (n≥3)

• Visualization:

  • Create bar graphs or line graphs for time course data

  • Include error bars and significance indicators

  • Consider heat maps for complex experimental designs with multiple conditions

Example data table format for Western blot quantification:

What approaches can help resolve contradictory results when studying SPBC23E6.01c with different methodologies?

When facing contradictory results across different experimental approaches:

• Validate antibody specificity:

  • Confirm specificity using knockout/knockdown controls

  • Perform peptide competition assays

  • Test multiple antibody lots or sources if available

• Cross-validate with orthogonal techniques:

  • Compare protein detection (Western blot) with mRNA expression (RT-qPCR/RNA-seq)

  • Complement antibody-based detection with tagged protein approaches (GFP-fusion)

  • Use mass spectrometry for independent protein identification and quantification

• Methodological troubleshooting:

  • Systematically vary experimental conditions (buffers, detergents, fixation methods)

  • Test different sample preparation techniques that might affect epitope accessibility

  • Consider post-translational modifications that might affect antibody recognition

• Biological explanations for discrepancies:

  • Different isoforms or splice variants may exist

  • Post-translational modifications may vary between conditions

  • Protein degradation or processing may occur differentially

  • Protein localization changes may affect detection in certain assays

• Integrated data analysis approach:

  • Create a decision tree for evaluating conflicting results

  • Weight evidence based on methodological strengths and limitations

  • Consider whether discrepancies reveal interesting biological phenomena rather than technical issues

Document all validation steps systematically and include detailed methodological descriptions when publishing to allow proper evaluation of potentially conflicting results.

How can I integrate SPBC23E6.01c protein expression data with transcriptomic analyses?

For integrative analysis of protein and RNA expression:

• Experimental design considerations:

  • Collect matched samples for both protein and RNA analyses

  • Include sufficient timepoints to capture expression dynamics

  • Ensure biological replicates (n≥3) for statistical power

• RNA analysis methods:

  • RT-qPCR for targeted analysis of SPBC23E6.01c mRNA

  • RNA-seq for genome-wide expression patterns and context

  • Use MultiRNAflow or similar tools for temporal expression analysis

• Protein analysis methods:

  • Western blotting with SPBC23E6.01c antibody for relative quantification

  • Mass spectrometry for absolute quantification and detection of modifications

• Data normalization and transformation:

  • Log-transform both protein and RNA expression values

  • Z-score normalization to compare relative changes

  • Consider time delays between transcription and translation

• Correlation analysis:

  • Calculate Pearson or Spearman correlation between mRNA and protein levels

  • Perform time-lagged correlation to account for delays in protein synthesis

  • Use scatter plots to visualize relationships

• Integrative visualization:

  • Create overlay line graphs showing both RNA and protein expression over time

  • Generate heatmaps for clustered expression patterns

  • Apply principal component analysis to identify major sources of variation

• Advanced integration methods:

  • Machine learning approaches to predict protein levels from mRNA data

  • Network analysis to identify co-regulated genes and proteins

  • Pathway enrichment analysis for functional interpretation

Example visualization of integrated analysis might include temporal clustering similar to what's shown in MultiRNAflow package, combining both protein and mRNA measurements across timepoints .

How can I determine if SPBC23E6.01c undergoes post-translational modifications and their functional significance?

To investigate post-translational modifications (PTMs) of SPBC23E6.01c:

• Initial screening approaches:

  • Run cell lysates on Phos-tag gels to detect phosphorylated forms

  • Perform 2D gel electrophoresis to separate protein isoforms with different charges

  • Treat lysates with phosphatase, deglycosylases, or deubiquitinases to identify modification types

• Western blot analysis:

  • Look for mobility shifts or multiple bands that might indicate PTMs

  • Use modification-specific antibodies (phospho-, acetyl-, SUMO-, ubiquitin-specific)

  • Apply techniques similar to those used for phosphorylated proteins like RPS6

• Mass spectrometry approaches:

  • Immunoprecipitate SPBC23E6.01c using the antibody

  • Perform tryptic digest followed by LC-MS/MS analysis

  • Use specialized techniques for PTM enrichment (TiO2 for phosphopeptides, etc.)

  • Analyze data with software that can identify modification sites

• Functional significance testing:

  • Generate mutants with modified PTM sites (phospho-null, phospho-mimetic)

  • Perform comparative phenotypic analyses

  • Assess protein-protein interactions or localization changes in mutants

  • Examine modification dynamics during cell cycle or stress conditions

• Quantitative analysis:

  • Determine stoichiometry of modifications

  • Monitor changes in modification levels under different conditions

  • Create temporal profiles of modification dynamics

Remember that the predicted function of SPBC23E6.01c as an RNA-binding protein and mRNA processing factor suggests that its activity might be regulated by phosphorylation or other modifications that affect RNA binding capability.

What are the methodological considerations for studying SPBC23E6.01c in the context of cellular stress responses?

To investigate SPBC23E6.01c's role in stress responses:

• Stress induction protocols:

  • Oxidative stress: H2O2 (0.5-2 mM) or menadione (10-50 μM)

  • Heat shock: Temperature shift from 30°C to 37-42°C

  • Osmotic stress: Sorbitol (1-2 M) or NaCl (0.5-1 M)

  • ER stress: Tunicamycin (0.5-2 μg/ml) or DTT (1-5 mM)

  • Nutrient limitation: Nitrogen or carbon source depletion

• Time-course analysis:

  • Collect samples at multiple timepoints (0, 15, 30, 60, 120 minutes)

  • Process for both protein and mRNA expression analysis

  • Monitor stress markers to confirm proper response induction

• Protein analysis approaches:

  • Western blotting with SPBC23E6.01c antibody to assess expression changes

  • Subcellular fractionation to detect localization changes

  • Co-IP to identify stress-specific interaction partners

• Transcriptional analysis:

  • RT-qPCR for targeted analysis of SPBC23E6.01c mRNA

  • RNA-seq for genome-wide expression patterns

  • Apply bioinformatic approaches similar to MultiRNAflow for temporal data

• Functional assessments:

  • Compare wild-type and SPBC23E6.01c mutant/deletion strains for stress sensitivity

  • Measure survival rates and growth recovery after stress exposure

  • Assess cell morphology and septum formation changes

• RNP (ribonucleoprotein) granule analysis:

  • If SPBC23E6.01c localizes to stress granules, perform microscopy with appropriate markers

  • Analyze co-localization with known stress granule components

  • Quantify granule formation dynamics under different stressors

Use redox-sensitive GFP reporters to monitor the cellular redox state during stress, which may correlate with SPBC23E6.01c function if it is involved in oxidative stress responses .

What experimental approaches can determine if SPBC23E6.01c is involved in septum formation and cell division in S. pombe?

Given that proper septum formation is critical in S. pombe cell division , researchers can investigate SPBC23E6.01c's potential role with these approaches:

• Conditional expression systems:

  • Create repressible promoter constructs for SPBC23E6.01c

  • Use temperature-sensitive alleles if available

  • Monitor septum formation during protein depletion or inactivation

• Microscopic analysis:

  • Calcofluor white or Aniline blue staining to visualize septum structure

  • Time-lapse microscopy of dividing cells with fluorescently tagged septum components

  • Electron microscopy for ultrastructural analysis of septum architecture

  • Immunofluorescence with SPBC23E6.01c antibody to assess localization during division

• Genetic interaction studies:

  • Test for synthetic lethality or growth defects with known septum formation genes

  • Create double mutants with genes involved in glucan synthesis or cell wall integrity

  • Perform genome-wide genetic screens similar to the brc1 E-MAP approach

• Biochemical approaches:

  • Analyze cell wall composition in SPBC23E6.01c mutants using techniques described for S. pombe cell wall analysis

  • Measure glucanase or glucan synthase activities

  • Assess protein glycosylation changes which may affect cell wall integrity

• Cell cycle analysis:

  • Synchronize cells and monitor SPBC23E6.01c localization during division

  • Compare septation timing and indices between wild-type and mutant cells

  • Test for genetic or physical interactions with known cell cycle regulators

• Quantitative phenotyping:

  • Measure septation index in various conditions

  • Quantify cell length at division

  • Assess frequency of septation defects (multi-septate cells, mispositioned septa)

Integration of these approaches can provide comprehensive insights into whether SPBC23E6.01c participates in the complex process of S. pombe septum formation and cell division, potentially through its predicted mRNA processing activity .