SPBC15D4.13c Antibody

What is SPBC15D4.13c and what is its role in fission yeast?

SPBC15D4.13c is a gene in Schizosaccharomyces pombe (fission yeast) that encodes a protein involved in chromatin organization and potentially in centromere function. Based on available research, this protein appears to interact with components of the Ino80 chromatin-remodeling complex, which is crucial for proper silencing mechanisms and centromere functionality . The protein has the UniProt accession number A6X982 and is identified as a component in the S. pombe strain 972 / ATCC 24843 .

Why do researchers use SPBC15D4.13c antibodies?

Researchers utilize SPBC15D4.13c antibodies primarily for:

• Studying chromatin organization and regulation

• Investigating protein-protein interactions in chromatin remodeling complexes

• Examining centromere function and silencing mechanisms

• Analyzing the role of this protein in cell cycle regulation

• Exploring its potential involvement in nutritional stress responses

These antibodies enable detection, localization, and functional characterization of the protein in various experimental contexts .

What are the optimal conditions for immunoprecipitation with SPBC15D4.13c antibodies?

For effective immunoprecipitation (IP) with SPBC15D4.13c antibodies in fission yeast:

• Cell preparation:

  • Grow cells to early log phase (~1 × 10^7/mL)

  • Harvest by centrifugation at 4°C, 3,000 × g for 2 min

  • Wash with ice-cold PBS and measure cell wet weight

• Cell lysis:

  • Resuspend cells in lysis buffer (50 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM EDTA, 1% Triton X-100) supplemented with protease inhibitors

  • Add 0.9 g chilled glass beads per sample

  • Disrupt cells with a cell disruptor for 3 min at 4°C, repeating 3 times with 3-min ice intervals

• Antibody binding:

  • Transfer 900 μL cell extract to low-retention microcentrifuge tubes

  • Add appropriate amount of SPBC15D4.13c antibody (recommended: 5-10 μg)

  • Rotate for 1-2 hours at 4°C

  • Use 30 μL protein A agarose slurry per sample, washed in lysis buffer

• Buffer selection:

  • For standard applications: TBS-based buffers (20 mM Tris-HCl, pH 7.5, 150 mM NaCl)

  • When antibody preservation is critical: Avoid sodium deoxycholate in buffers

How can I optimize Western blotting for SPBC15D4.13c detection?

For optimal Western blotting results:

• Sample preparation:

  • Extract proteins from log-phase fission yeast cells

  • Use a lysis buffer containing 1% Triton X-100 with protease inhibitors

  • Denature proteins by heating at 95°C for 5 minutes in Laemmli buffer

• Gel electrophoresis:

  • Use 10-12% SDS-PAGE gels for optimal resolution

  • Load 15-30 μg of total protein per lane

  • Include molecular weight markers spanning the expected protein size

• Transfer and detection:

  • Transfer to nitrocellulose or PVDF membrane at 100V for 1 hour (wet) or 25V for 30 minutes (semi-dry)

  • Block with 5% non-fat dry milk in PBS-T for 1 hour

  • Incubate with SPBC15D4.13c antibody at 1:1000 dilution overnight at 4°C

  • Use HRP-conjugated secondary antibody and ECL detection

• Controls:

  • Include wild-type extract as positive control

  • Include SPBC15D4.13c deletion strain extract as negative control

  • Use another well-characterized protein (e.g., tubulin) as loading control

How can SPBC15D4.13c antibodies be used in ChIP-seq experiments to study chromatin association?

ChIP-seq with SPBC15D4.13c antibodies requires careful optimization:

• Cross-linking and chromatin preparation:

  • Cross-link S. pombe cells with 1% formaldehyde for 15 minutes at room temperature

  • Quench with 125 mM glycine for 5 minutes

  • Lyse cells and sonicate chromatin to 200-500 bp fragments

• Immunoprecipitation:

  • Pre-clear chromatin with protein A beads

  • Incubate with SPBC15D4.13c antibody (typically 5-10 μg per sample) overnight at 4°C

  • Add protein A beads and incubate for 2-4 hours

  • Wash stringently to reduce background

• Quality control checks:

  • Include spike-in controls (e.g., S. cerevisiae chromatin at 1:8 ratio) for normalization

  • Perform qPCR validation of known binding sites before sequencing

  • Use IgG control for background assessment

• Data analysis considerations:

  • Align to the S. pombe reference genome

  • Consider the potential association with centromeric regions and replication origins

  • Look for co-occupancy with Ino80 complex components

What protein-protein interactions involve SPBC15D4.13c and how can they be studied?

Based on available research, SPBC15D4.13c likely participates in interactions with chromatin remodeling complexes. To study these interactions:

• Co-immunoprecipitation approaches:

  • Use SPBC15D4.13c antibodies for pull-down experiments

  • Analyze precipitated proteins by mass spectrometry

  • Validate specific interactions with Western blotting against suspected partners

• Reciprocal pull-downs:

  • Create tagged versions of suspected interaction partners

  • Perform pull-downs with tag-specific antibodies

  • Probe for SPBC15D4.13c in the immunoprecipitated material

• Proximity-based methods:

  • Consider BioID or APEX2 proximity labeling by fusing these enzymes to SPBC15D4.13c

  • Identify proteins in close proximity under various conditions

• Interaction analysis in mutant backgrounds:

  • Test interactions in strains with mutations in the Ino80 complex components

  • Examine how nutrient availability affects these interactions

How can I verify the specificity of my SPBC15D4.13c antibody?

Verifying antibody specificity is crucial for reliable results:

• Essential controls:

  • Test antibody on SPBC15D4.13c deletion strain extracts (should show no signal)

  • Compare with wild-type extracts (should show specific band)

  • Perform peptide competition assay to confirm specificity

• Expression system testing:

  • Express SPBC15D4.13c in heterologous systems with tags

  • Compare detection by anti-tag and anti-SPBC15D4.13c antibodies

• Cross-reactivity assessment:

  • Test on closely related proteins or paralogs

  • Examine reactivity in other yeast species if applicable

• Documentation:

  Control Type	Expected Result	Interpretation if Failed
  Wild-type extract	Single band at expected MW	Possible antibody degradation or non-specific binding
  Deletion strain extract	No band	Antibody lacks specificity
  Peptide competition	Diminished or absent signal	Antibody may have multiple epitopes
  Tagged protein	Co-localization of tag and antibody signals	Epitope masking or antibody not recognizing native protein

What are common issues when using SPBC15D4.13c antibodies in immunofluorescence and how can they be resolved?

When performing immunofluorescence with SPBC15D4.13c antibodies:

• High background:

  • Increase blocking time (use 5% BSA for 2 hours)

  • Use filtered antibody solutions

  • Include 0.1% Tween-20 in wash buffers

  • Consider pre-adsorbing antibody with acetone powder from deletion strain

• Weak or absent signal:

  • Optimize fixation: Test 4% paraformaldehyde vs. methanol fixation

  • Try different epitope retrieval methods (mild heat treatment)

  • Increase antibody concentration and incubation time

  • Ensure correct cell wall digestion protocol for S. pombe

• Non-specific signals:

  • Include deletion strain controls

  • Use secondary-only controls to check for non-specific binding

  • Test alternative blocking agents (goat serum, fish gelatin)

• Cell morphology issues:

  • Adjust sorbitol concentration in fixation buffer

  • Reduce centrifugation speeds during washes

  • Optimize spheroplasting conditions for S. pombe

How does SPBC15D4.13c contribute to centromere function and what methods can reveal this relationship?

Research suggests SPBC15D4.13c may play a role in centromere function through chromatin remodeling :

• Experimental approaches:

  • ChIP-seq analysis targeting SPBC15D4.13c and centromere markers simultaneously

  • Genetic interaction studies with known centromere components

  • Live cell imaging of tagged SPBC15D4.13c during cell division

• Key findings from existing research:

  • Mutations in Ino80 complex components, which may interact with SPBC15D4.13c, reduce CENP-A^Cnp1 occupancy in the central core region of centromeres

  • The Ino80 complex appears to be involved in replacing histone H3 with CENP-A^Cnp1 at centromeres

  • These functions are crucial for proper chromosome segregation

• Methodological considerations:

  • Use TBZ (thiabendazole) sensitivity assays to examine centromere functionality

  • Monitor rates of chromosome loss in SPBC15D4.13c mutants

  • Examine recruitment of the protein to artificial chromosomes

What is the relationship between SPBC15D4.13c and nutrient sensing or stress response pathways?

The contribution of SPBC15D4.13c to nutrient sensing might be examined through:

• Experimental approaches:

  • Quantify SPBC15D4.13c expression levels under different nutrient conditions

  • Perform fitness profiling of deletion strains under varying nutrient sources

  • Examine genetic interactions with TOR pathway components

• Potential research questions:

  • Does SPBC15D4.13c expression change in response to nitrogen source quality?

  • Is the protein involved in growth regulation under nutrient limitation?

  • How does Torin1 (TOR inhibitor) treatment affect SPBC15D4.13c function?

• Methodological framework:

  • Growth assays in minimal media with different nitrogen sources

  • Western blotting to track protein levels during nutrient shifts

  • ChIP-seq to identify changes in chromatin association under stress

How can advanced proteomic approaches enhance our understanding of SPBC15D4.13c function?

Modern proteomic techniques offer new insights into SPBC15D4.13c:

• Proteome-wide antibody screening:

  • Apply methods similar to autoantigenomics to identify SPBC15D4.13c interactions

  • Use protein arrays displaying S. pombe proteins to identify binding partners

  • Apply machine learning to identify patterns in interaction data

• Cross-linking mass spectrometry (XL-MS):

  • Employ protein cross-linking coupled with mass spectrometry to identify spatial relationships

  • Map interaction surfaces within protein complexes containing SPBC15D4.13c

  • Create structural models of these interactions

• Thermal proteome profiling:

  • Use cellular thermal shift assays to assess SPBC15D4.13c stability under different conditions

  • Identify small molecules or conditions that affect protein stability

What computational approaches can be used to predict SPBC15D4.13c function and guide antibody-based experiments?

Computational methods complement antibody-based research:

• Structural prediction and antibody epitope mapping:

  • Use AlphaFold or similar tools to predict SPBC15D4.13c structure

  • Map antibody epitopes to guide experimental design

  • Predict potential post-translational modifications that might affect antibody binding

• Network analysis:

  • Integrate ChIP-seq, proteomics, and genetic interaction data

  • Use network algorithms to predict functional associations

  • Guide new experimental hypotheses based on computational predictions

• Machine learning applications:

  • Train models on existing ChIP-seq data to predict binding sites in new conditions

  • Use deep learning to extract patterns from immunofluorescence images

  • Apply generative models to design new antibody variants for improved specificity