SPAC12B10.13 Antibody

Basic Research Questions

• What is SPAC12B10.13 and why is it significant in S. pombe research?

  SPAC12B10.13 is a gene in Schizosaccharomyces pombe (fission yeast) that encodes a protein containing a CTLH domain with a score of 0.898 . It functions as a ubiquitin ligase, playing a role in protein degradation pathways. This protein is significant in S. pombe research for several reasons:

  • It has been identified among a group of ubiquitin ligases (including SPAC12B10.13, SPBC29A3.03C, SPBC106.13) that may play roles in transcriptional regulation

  • It may be involved in cytoplasmic freezing phenomena during deep starvation in S. pombe

  • Its characterization contributes to understanding conserved eukaryotic ubiquitin-mediated protein quality control systems

• What are the basic experimental applications for SPAC12B10.13 Antibody?

  SPAC12B10.13 Antibody can be utilized in multiple experimental techniques:

  • Western blotting: For detecting the protein in cell lysates and quantitative analysis

  • Immunoprecipitation: For isolating the protein and its binding partners

  • Immunofluorescence: For visualizing subcellular localization

  • ChIP (Chromatin Immunoprecipitation): If the protein associates with DNA directly or indirectly

  The antibody is commercially available from manufacturers like CUSABIO (product code: CSB-PA604606XA01SXV) , typically in quantities suitable for research applications (2ml/0.1ml or 10mg options).

• How does the CTLH domain in SPAC12B10.13 function in cellular processes?

  The CTLH (C-terminal to LisH) domain in SPAC12B10.13 is a protein interaction module with a scoring value of 0.898, as documented in fission yeast screening studies . This domain:

  • Facilitates protein-protein interactions within multi-subunit complexes

  • Often works together with LisH domains in establishing protein complexes

  • In other organisms, CTLH domain-containing proteins frequently participate in ubiquitin-mediated protein degradation pathways

  • May contribute to stress response mechanisms through regulated protein turnover

• What expression patterns does SPAC12B10.13 show during different growth phases?

  While detailed expression profiling specifically for SPAC12B10.13 is not fully characterized in the provided literature, general patterns for S. pombe ubiquitin ligases suggest:

  • Expression levels may change during different cell cycle phases

  • Under stress conditions like glucose starvation, expression patterns may shift as part of adaptive responses

  • During stationary phase or quiescence, expression regulation may contribute to cytoplasmic freezing mechanisms

  • Experimental approaches using the antibody for Western blotting or immunofluorescence across time-course analyses would help establish specific expression patterns

Advanced Research Applications

• How can SPAC12B10.13 Antibody be validated for specificity in S. pombe experiments?

  Rigorous validation of SPAC12B10.13 Antibody specificity should include:

  • Western blot comparison between wild-type and ΔSPAC12B10.13 deletion strains (the deletion strain should show absence of the expected band)

  • Pre-absorption tests with purified recombinant SPAC12B10.13 protein

  • Peptide competition assays to verify epitope specificity

  • Correlation with tagged versions of the protein (e.g., comparing antibody signal with GFP signal in a SPAC12B10.13-GFP fusion strain)

  • Mass spectrometry analysis of immunoprecipitated material to confirm identity

  These validation steps are essential before proceeding with complex experimental applications to ensure reliable interpretations of results.

• What is the role of SPAC12B10.13 in cytoplasmic freezing phenomena?

  Research into cytoplasmic freezing (CF) in S. pombe has identified SPAC12B10.13 as potentially relevant to this process . Experimental approaches to investigate this relationship include:

  • Comparative analysis of wild-type and ΔSPAC12B10.13 strains for their ability to undergo cytoplasmic freezing during deep starvation

  • Tracking protein localization using the antibody during transition to stationary phase

  • Measuring protein mobility in the cytoplasm using techniques like FRAP (Fluorescence Recovery After Photobleaching)

  • Analyzing interaction partners specifically during starvation conditions

  Studies have indicated that deletion mutants of certain genes fail to display cytoplasmic freezing, and SPAC12B10.13 may be among 500 potential candidate genes involved in this phenomenon .

• How can ChIP-chip experiments with SPAC12B10.13 Antibody reveal genomic associations?

  ChIP-chip experiments using SPAC12B10.13 Antibody require:

  1. Crosslinking protein-DNA interactions with formaldehyde (1% for 10-15 minutes)

  2. Cell lysis and chromatin fragmentation by sonication to 200-500bp fragments

  3. Immunoprecipitation with optimized amounts of SPAC12B10.13 Antibody

  4. Washing, elution, and reversal of crosslinks

  5. DNA amplification and hybridization to microarrays

  6. Data analysis for enrichment peaks

  Similar approaches have been used for studying ribosomal proteins in S. pombe, revealing associations with both coding and non-coding genes, tRNAs, and energy metabolism pathways . This methodology could help determine if SPAC12B10.13 has direct genomic interactions related to its function.

• What are the optimal conditions for immunofluorescence using SPAC12B10.13 Antibody?

  For successful immunofluorescence with SPAC12B10.13 Antibody:

  • Fixation: 4% paraformaldehyde (15-20 minutes) or cold methanol (-20°C, 10 minutes)

  • Permeabilization: 0.1-0.5% Triton X-100 (5-10 minutes)

  • Blocking: 5% BSA or normal serum (30-60 minutes)

  • Primary antibody: SPAC12B10.13 Antibody at optimized dilution (1:100-1:1000)

  • Secondary antibody: Fluorophore-conjugated anti-species antibody (1:500-1:2000)

  Counterstaining with DAPI for nuclei visualization and phalloidin for actin structures can provide context for localization patterns. Controls should include omission of primary antibody and parallel staining of deletion strains.

• How can SPAC12B10.13 Antibody be used to investigate protein interactions in ubiquitin-proteasome pathways?

  To study SPAC12B10.13's role in ubiquitin-proteasome pathways:

  • Co-immunoprecipitation: Use the antibody to pull down SPAC12B10.13 and associated proteins

  • Reverse co-IP: Immunoprecipitate known ubiquitin-proteasome components and probe for SPAC12B10.13

  • Ubiquitination assays: Detect ubiquitinated substrates in wild-type vs. deletion strains

  • Proteasome inhibition: Compare SPAC12B10.13 interactions with and without proteasome inhibitors

  • Proximity ligation assays: Visualize in situ interactions between SPAC12B10.13 and suspected partners

  These approaches can reveal whether SPAC12B10.13 functions similarly to other CTLH domain-containing ubiquitin ligases in targeting specific substrates for degradation.

• What methodologies can determine if SPAC12B10.13 has connections to riboneogenesis pathways?

  Riboneogenesis is a pathway linking ribosomal proteins and energy metabolism, recently discovered in S. cerevisiae and potentially conserved in S. pombe . To investigate SPAC12B10.13's involvement:

  • ChIP-chip analysis to determine if SPAC12B10.13 associates with genes involved in riboneogenesis

  • Co-immunoprecipitation followed by mass spectrometry to identify interactions with components like fructose-1,6-bisphosphatase (FBP1)

  • Comparative metabolic profiling between wild-type and deletion strains, focusing on ribose-phosphate intermediates

  • Genetic interaction studies between SPAC12B10.13 and known riboneogenesis genes

  Research has shown that in S. pombe, ribosomal proteins associate with energy metabolism pathways, suggesting conservation of riboneogenesis across yeast species .

Technical Considerations

• How should samples be prepared for optimal detection of SPAC12B10.13 in Western blots?

  For effective Western blotting with SPAC12B10.13 Antibody:

  • Cell lysis: Use a buffer containing detergents (1% Triton X-100 or NP-40), protease inhibitors, and phosphatase inhibitors

  • Protein determination: Normalize loading to 20-50 μg total protein per lane

  • Sample preparation: Add reducing agent (DTT or β-mercaptoethanol) and heat at 95°C for 5 minutes

  • Gel selection: 10-12% SDS-PAGE for optimal separation

  • Transfer: PVDF membrane for better protein retention

  • Blocking: 5% non-fat milk or BSA in TBST for 1 hour

  • Antibody dilution: Optimize between 1:1000-1:5000 based on signal strength

  • Detection: Enhanced chemiluminescence for sensitive detection

  Including both positive controls (wild-type lysate) and negative controls (deletion strain lysate) is essential for interpretation.

• What are the expected phenotypes of SPAC12B10.13 deletion mutants?

  Based on studies of S. pombe deletion libraries and the functions of CTLH domain proteins:

  • Cytoplasmic freezing deficiency: Inability to properly establish cytoplasmic freezing during deep starvation

  • Potential alterations in protein homeostasis due to disrupted ubiquitin ligase function

  • Possible stress sensitivity, particularly under nutrient limitation conditions

  • Changes in protein degradation rates for specific substrates

  Experimental approaches should include comparative growth assays under different conditions, microscopic analysis of cellular morphology, and biochemical assessment of ubiquitination patterns between wild-type and deletion strains.

• How can post-translational modifications of SPAC12B10.13 be detected?

  To investigate post-translational modifications (PTMs) of SPAC12B10.13:

  • Phosphorylation: Immunoprecipitate using SPAC12B10.13 Antibody, then probe with phospho-specific antibodies (anti-phosphoserine, anti-phosphothreonine, anti-phosphotyrosine)

  • Ubiquitination: Use denaturing conditions during immunoprecipitation to preserve ubiquitin modifications, then probe with anti-ubiquitin antibodies

  • Mass spectrometry: Perform LC-MS/MS on immunoprecipitated SPAC12B10.13 to identify and map modification sites

  • Phosphatase treatment: Compare protein migration pattern before and after phosphatase treatment to detect mobility shifts

  As a ubiquitin ligase, SPAC12B10.13 may itself be regulated by PTMs that affect its activity, stability, or localization.

• How should cross-reactivity testing be performed when using SPAC12B10.13 Antibody in related species?

  When testing cross-reactivity:

  1. Perform sequence alignment of the epitope region across related species (S. cerevisiae, other fungi)

  2. Run Western blots with lysates from multiple species alongside S. pombe controls

  3. Include appropriate loading controls for each species

  4. Test reactivity in both wild-type and knockout/knockdown samples when available

  5. Conduct pre-absorption tests by incubating the antibody with purified antigen before use

  Cross-reactivity could be useful for studying evolutionarily conserved functions but may complicate interpretation of results in multi-species studies.

• What controls are essential when using SPAC12B10.13 Antibody in co-immunoprecipitation experiments?

  Critical controls for co-immunoprecipitation include:

  • Input control: 5-10% of the lysate used for immunoprecipitation

  • IgG control: Non-specific antibody of the same isotype and species

  • Negative control: Immunoprecipitation from deletion strain lysates

  • Reverse co-IP: Confirm interactions by immunoprecipitating the suspected partner protein

  • Competing peptide control: Pre-incubate antibody with excess antigen peptide

  • DNase/RNase treatment: Eliminate nucleic acid-mediated interactions if suspected

  These controls help distinguish specific interactions from background binding and confirm the biological relevance of identified protein associations.