SPCC16C4.20c Antibody

What is SPCC16C4.20c and why is it studied in research?

SPCC16C4.20c is a protein encoded in the genome of Schizosaccharomyces pombe (fission yeast), specifically in strain 972 / ATCC 24843. The protein is identified by UniProt accession number Q9P7Z9 . S. pombe has become an increasingly important model organism for investigating various molecular and cellular processes over the past 50 years . This particular protein is studied as part of broader research into S. pombe's cellular mechanisms, which often reveal conserved eukaryotic processes applicable to human cell biology.

Researchers investigate this protein using antibodies to understand its function, localization, interaction partners, and role in fundamental cellular processes. S. pombe shares more common features with humans than budding yeast, including gene structures, chromatin dynamics, and mechanisms of gene expression control , making proteins like SPCC16C4.20c valuable for understanding evolutionarily conserved biological functions.

What experimental applications are SPCC16C4.20c antibodies typically used for?

SPCC16C4.20c antibodies are primarily used in these experimental applications:

• Co-immunoprecipitation (Co-IP): For detecting protein-protein interactions in fission yeast

• Western blotting: For protein expression and quantification analysis

• Immunofluorescence: For determining subcellular localization

• Chromatin immunoprecipitation (ChIP): For studying protein-DNA interactions if the protein has DNA-binding properties

How should researchers prepare S. pombe samples for antibody-based experiments?

For effective use of SPCC16C4.20c antibodies, proper sample preparation is critical. The standard protocol involves:

• Cell culture: Grow S. pombe cells to early log phase (~1×10^7 cells/mL)

• Collection: Harvest cells by centrifugation at 4°C, 3,000×g for 2 minutes

• Washing: Wash cell pellet with ice-cold 1× PBS

• Lysis buffer preparation: Use 50 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM EDTA, 0.5% NP-40, 10% Glycerol with fresh supplements of:

  • 1 mM DTT

  • 1 mM PMSF

  • 1× protease inhibitor cocktail

• Cell lysis: Add glass beads (425–600 μm) and disrupt cells mechanically at 4°C

• Extract clarification: Centrifuge at 20,000×g for 10 minutes at 4°C to remove cell debris

The composition of the lysis buffer can be modified for weak interactions by reducing salt and NP-40 concentrations to 60 mM and 0.05% respectively .

What is the optimal protocol for co-immunoprecipitation using SPCC16C4.20c antibody?

The optimized co-immunoprecipitation protocol for SPCC16C4.20c antibody follows this methodological approach:

Materials needed:

• SPCC16C4.20c antibody

• Protein A/G agarose beads

• Lysis buffer (as described in 1.3)

• Wash buffer: 50 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM EDTA, 0.5% NP-40, 10% Glycerol with 1 mM DTT and 1 mM PMSF

• 1× and 2× Laemmli buffer

Protocol steps:

• Normalize protein concentration using Bradford assay

• Incubate 900 μL of normalized cell extract with the recommended amount of SPCC16C4.20c antibody for 1-2 hours at 4°C with rotation

• Prepare an "Input" sample by mixing 50 μL of normalized extract with 50 μL of 2× Laemmli buffer

• Wash 30 μL of protein A agarose slurry three times with lysis buffer

• Add the antibody-lysate mixture to the washed beads and incubate for 1-2 hours at 4°C with rotation

• Wash beads three times with ice-cold wash buffer

• Elute bound proteins by adding 40 μL of 1× Laemmli buffer and heating at 95°C for 5 minutes

• Analyze samples by SDS-PAGE and Western blotting

For weak or transient protein interactions, consider using chemical cross-linkers such as formaldehyde or dithiobis-succinimidyl propionate (DSP) . If protein interactions might be mediated by DNA or RNA, add DNase or RNase to the lysis buffer during cell lysis and binding steps.

How can researchers optimize antibody specificity and reduce background in Western blots?

To improve specificity and reduce background when using SPCC16C4.20c antibody in Western blotting:

Optimization strategies:

• Antibody dilution: Determine optimal working concentration (typically 1:1000 to 1:5000) through titration experiments

• Blocking optimization: Test different blocking agents (5% non-fat milk, 5% BSA, or commercial blockers) to identify what works best

• Washing stringency: Increase washing stringency by:

  • Extending wash duration or frequency

  • Adding 0.1-0.3% Tween-20 to wash buffers

  • For stubborn background, perform more stringent washes by increasing salt concentration up to 500 mM

• Secondary antibody selection: Choose highly cross-adsorbed secondary antibodies specific to the host species of the primary antibody

• Negative controls: Always include:

  • A sample without primary antibody

  • If possible, a sample from a knockout or deletion strain

For membrane preparations:

• Transfer proteins to nitrocellulose or PVDF membranes at appropriate voltage/amperage

• Block membranes with blocking buffer for 1 hour at room temperature

• Incubate with SPCC16C4.20c antibody at recommended dilution (typically 1:1000) overnight at 4°C

• Wash 3-5 times with TBS-T (TBS with 0.1% Tween-20)

• Incubate with HRP-conjugated secondary antibody for 1 hour at room temperature

• Wash extensively before detection

What factors affect the efficiency of antibody pull-down experiments in S. pombe?

Several critical factors influence the success of pull-down experiments using SPCC16C4.20c antibody:

Key factors and optimization approaches:

• Cell lysis conditions:

  • Lysis efficiency: Ensure >95% of cells are broken by checking under microscopy

  • Glass bead ratio: Use ~3g of glass beads per gram of cell wet weight

  • Buffer composition: For weak interactions, reduce salt and detergent concentrations

• Antibody quality and quantity:

  • Use the recommended amount of antibody (typically 2-5 μg per sample)

  • Store antibodies in small aliquots to prevent contamination and repeated freeze-thaw cycles

  • For mouse monoclonal antibodies with low affinity to protein A (e.g., IgG1 isotype), consider using secondary antibodies to improve binding efficiency

• Binding conditions:

  • Incubation time: Typically 1-2 hours, but may need optimization

  • Temperature: Standard is 4°C to maintain native interactions

  • Rotation: Use gentle rotation to maximize antibody-antigen contact

• Washing stringency:

  • Number of washes: Typically 3-5 times, but can be increased to reduce background

  • Buffer stringency: For higher stringency, increase salt concentration up to 500 mM

  • Duration: Standard is 5 minutes per wash

• Protein-protein interaction nature:

  • For DNA/RNA-mediated interactions: Add DNase or RNase during lysis and binding

  • For weak interactions: Use chemical cross-linking with formaldehyde or DSP

  • Protein abundance: For low-abundance proteins, reduce total lysis buffer to 600 μL

Optimizing these factors may require empirical testing based on the specific experimental goals and the nature of the protein interactions being studied.

How can SPCC16C4.20c antibody be used in chromatin immunoprecipitation (ChIP) studies?

For researchers investigating if SPCC16C4.20c interacts with chromatin or is involved in transcriptional regulation, ChIP methodology can be applied:

ChIP protocol for S. pombe using SPCC16C4.20c antibody:

• Cell growth and cross-linking:

  • Grow cells to a density of 2×10^8 cells/mL

  • Cross-link by adding formaldehyde to 1% final concentration at room temperature for 1 hour

  • Quench with glycine (0.125 M final concentration)

• Cell lysis and chromatin preparation:

  • Harvest cells and wash with ice-cold PBS

  • Resuspend in cell lysis buffer (0.1% SDS, 50 mM HEPES-KOH pH 7.5, 1% Triton X, 0.1% sodium deoxycholate, 1 mM EDTA, 150 mM NaCl) with protease inhibitors

  • Lyse cells using a Fastprep machine or similar device

  • Sonicate chromatin to fragments of 500-1000 bp average size

• Immunoprecipitation:

  • Incubate fragmented chromatin with 2-5 μg of SPCC16C4.20c antibody

  • Add protein A-Sepharose beads washed in wash buffer

  • Wash immuno-complexes with increasing stringency

  • Reverse cross-links at 65°C overnight

  • Digest proteins with proteinase K

• DNA purification and analysis:

  • Extract DNA using phenol-chloroform and ethanol precipitation

  • Analyze by quantitative PCR with specific primers

  • Calculate enrichment relative to input and negative control regions

This technique can reveal if SPCC16C4.20c is associated with specific genomic regions, potentially indicating a role in transcriptional regulation, chromatin remodeling, or DNA metabolism.

What approaches can be used to study interactions between SPCC16C4.20c and other proteins in a complex?

For studying protein complexes containing SPCC16C4.20c, several advanced approaches can be employed:

1. Tandem affinity purification:

• Generate a strain expressing tagged SPCC16C4.20c (e.g., TAP-tag, FLAG-HA tandem tag)

• Perform sequential purification using two different affinity matrices

• Identify complex components by mass spectrometry

• Confirm interactions with co-immunoprecipitation using SPCC16C4.20c antibody

2. Reciprocal co-immunoprecipitation validation:

• After identifying potential interacting partners, perform co-IP with antibodies against those partners

• Confirm the presence of SPCC16C4.20c in the precipitated complexes

• Example of this approach is shown in a study involving Ino80 complex in S. pombe

3. In vivo cross-linking followed by Co-IP:

• Cross-link cells using DSP or formaldehyde to capture transient interactions

• Perform Co-IP with SPCC16C4.20c antibody

• Reverse cross-links and identify interacting proteins

4. Proximity-dependent labeling:

• Generate BioID or TurboID fusion with SPCC16C4.20c

• Allow proximity-dependent biotinylation in vivo

• Purify biotinylated proteins using streptavidin

• Validate interactions with co-IP using SPCC16C4.20c antibody

5. Yeast two-hybrid screening:

• Use SPCC16C4.20c as bait to screen for interacting proteins

• Validate interactions using co-IP with the antibody in native conditions

Each approach has strengths and limitations, and combining multiple methods provides more robust evidence for protein-protein interactions.

How might SPCC16C4.20c antibody be used in comparative studies between S. pombe and other model organisms?

The evolutionary conservation of certain cellular mechanisms makes comparative studies valuable. SPCC16C4.20c antibody can be used in this context:

Comparative analysis approaches:

• Ortholog identification and functional conservation:

  • Identify potential orthologs in other organisms through bioinformatics

  • Use antibodies against these orthologs for parallel experiments

  • Compare protein localization, interactions, and functions

  • Assess whether the S. pombe protein can complement mutants in other species, similar to how the S. cerevisiae CDC28 gene could rescue S. pombe cdc2 mutants

• Cross-species complementation studies:

  • Express SPCC16C4.20c in other model organisms with mutations in potential orthologous genes

  • Use the antibody to verify expression and localization

  • Assess functional rescue of mutant phenotypes

• Evolutionary analysis of protein complexes:

  • Use the antibody to immunoprecipitate SPCC16C4.20c complexes

  • Compare complex composition with similar complexes in other organisms

  • Identify evolutionarily conserved and divergent components

  • This approach has been informative for understanding cell cycle proteins

• Functional domain conservation:

  • Generate chimeric proteins with domains from SPCC16C4.20c and potential orthologs

  • Use the antibody (if the epitope is conserved) to study localization and function

  • Determine which domains are functionally interchangeable across species

These approaches have been particularly valuable in understanding evolutionary conservation of cell cycle regulation, as demonstrated by studies with cdc2 and CDK2 .

What are common issues in antibody pull-down experiments with SPCC16C4.20c and how can they be resolved?

Researchers frequently encounter these challenges when working with SPCC16C4.20c antibody in pull-down experiments:

For persistent issues, consider alternative experimental approaches such as proximity labeling (BioID, TurboID) or stable isotope labeling with amino acids in cell culture (SILAC) to increase sensitivity and specificity.

How should researchers validate the specificity of SPCC16C4.20c antibody?

Thorough validation of antibody specificity is crucial for reliable research results. For SPCC16C4.20c antibody, implement these validation strategies:

1. Genetic validation:

• Test antibody reactivity against SPCC16C4.20c deletion strain (negative control)

• Compare with wild-type strain (positive control)

• Test against overexpression strain for increased signal

2. Peptide competition assay:

• Pre-incubate antibody with excess immunizing peptide/protein

• Perform standard immunodetection in parallel with untreated antibody

• Specific signals should be blocked by peptide competition

3. Multiple antibody approach:

• Use alternative antibodies against different epitopes of SPCC16C4.20c

• Compare results from different antibodies

• Concordant results increase confidence in specificity

4. Tagged protein validation:

• Generate S. pombe strain expressing tagged SPCC16C4.20c (HA, FLAG, GFP, etc.)

• Perform parallel detection with both SPCC16C4.20c antibody and tag-specific antibody

• Co-localization or co-immunoprecipitation confirms specificity

5. Mass spectrometry validation:

• Immunoprecipitate with SPCC16C4.20c antibody

• Identify proteins in immunoprecipitate by mass spectrometry

• Confirm presence of SPCC16C4.20c and its known interactors

6. RNA interference:

• If applicable, reduce SPCC16C4.20c expression using RNAi

• Observe corresponding reduction in antibody signal

• Quantify correlation between expression level and signal intensity

Thorough validation increases confidence in experimental results and should be documented in publications using the antibody.

What considerations are important when adapting protocols for different experimental techniques using SPCC16C4.20c antibody?

When adapting protocols for different applications with SPCC16C4.20c antibody, consider these technique-specific modifications:

For Western blotting:

• Optimize antibody dilution (typically 1:1000 to 1:5000)

• Test different blocking agents (milk vs. BSA)

• Consider membrane type (PVDF vs. nitrocellulose)

• Determine optimal exposure time for detection

• For weak signals, consider using enhanced chemiluminescence (ECL) substrates with higher sensitivity

For immunofluorescence:

• Test different fixation methods (paraformaldehyde, methanol, or acetone)

• Optimize permeabilization conditions (Triton X-100, saponin, or digitonin concentrations)

• Determine appropriate antibody concentration (typically higher than for Western blotting)

• Test different blocking agents to minimize background

• Consider signal amplification methods for low-abundance proteins

For chromatin immunoprecipitation (ChIP):

• Optimize cross-linking conditions (time and formaldehyde concentration)

• Determine optimal sonication conditions for proper chromatin fragmentation

• Increase antibody amount (typically 2-5 μg per reaction)

• Include appropriate positive and negative control regions

• Consider using qPCR, ChIP-seq, or ChIP-chip for analysis

For co-immunoprecipitation (Co-IP):

• Adjust salt and detergent concentrations based on interaction strength

• For weak interactions, reduce NP-40 to 0.05% and salt to 60 mM

• For DNA/RNA-dependent interactions, add nucleases to the lysis buffer

• For transient interactions, consider chemical cross-linking

• Modify bead type and amount based on antibody species and isotype

Across all techniques:

• Always include appropriate positive and negative controls

• Document all optimization steps for reproducibility

• Consider antibody isotype for secondary antibody selection

• For mouse monoclonal antibodies with low affinity to protein A (e.g., mouse IgG1), use secondary antibodies during immunoprecipitation

Careful optimization for each technique will maximize the utility of SPCC16C4.20c antibody across different experimental applications.

How is SPCC16C4.20c antibody being used in current cell cycle research with S. pombe?

S. pombe has been a powerful model organism for cell cycle research, with pioneering discoveries including the identification of Cdc2 as the master regulator of the cell cycle . Current research using SPCC16C4.20c antibody in this field includes:

• Investigation of cell cycle checkpoints:

  • Using antibody pull-down to identify interactions between SPCC16C4.20c and known cell cycle regulators

  • Determining if SPCC16C4.20c protein levels or modifications change throughout the cell cycle

  • Studying potential roles in G2/M transition, which is a major control point in S. pombe

• Analysis of regulatory networks:

  • Combining antibody-based techniques with genetic approaches similar to those used in groundbreaking studies of cdc2 and related proteins

  • Using ChIP to investigate if SPCC16C4.20c has any role in transcriptional regulation during the cell cycle

• Comparative studies with related proteins:

  • Investigating potential functional relationships with better-characterized proteins

  • Using approaches similar to those that revealed complementation between S. pombe cdc2 and S. cerevisiae CDC28

Research with S. pombe continues to provide insights into conserved mechanisms of cell cycle control, building on the foundation established by pioneers in the field such as Paul Nurse .

What emerging techniques might enhance the utility of SPCC16C4.20c antibody in future research?

Several cutting-edge technologies and approaches are poised to expand the application of SPCC16C4.20c antibody in research:

• Super-resolution microscopy:

  • Techniques like STORM, PALM, and SIM can provide nanoscale resolution of protein localization

  • Combined with SPCC16C4.20c antibody, these approaches can reveal precise subcellular distribution

• Proximity proteomics:

  • BioID, TurboID, or APEX2 fusions can identify proteins in close proximity to SPCC16C4.20c

  • Results can be validated using conventional antibody-based approaches

• Single-cell proteomics:

  • Mass cytometry (CyTOF) using metal-conjugated antibodies allows multiplexed protein detection

  • Development of single-cell Western blotting techniques can reveal cell-to-cell variation

• CRISPR-based approaches:

  • CRISPR-mediated tagging of endogenous SPCC16C4.20c to introduce fluorescent or affinity tags

  • Validation of tagged proteins using the antibody enhances confidence in results

• Microfluidics and live-cell imaging:

  • Combining microfluidic devices with immunofluorescence can track protein dynamics during cell cycle progression

  • Time-resolved approaches can reveal functional relationships not detectable in fixed samples

• Computational and systems biology integration:

  • Incorporation of antibody-derived data into protein interaction networks

  • Machine learning approaches to predict protein functions based on localization and interaction data

These emerging techniques, combined with established antibody-based methods, promise to provide deeper insights into the function of SPCC16C4.20c and its role in cellular processes.

How might SPCC16C4.20c antibody contribute to translational research beyond basic science?

While S. pombe research is primarily focused on basic biology, findings from such studies have significant translational potential. SPCC16C4.20c antibody could contribute to this translational bridge in several ways:

• Cancer research applications:

  • If human orthologs of SPCC16C4.20c are identified, the knowledge gained from S. pombe studies could inform cancer biology

  • The antibody could be used in pilot studies to validate conservation of protein interactions

  • Similar approaches revealed conservation of cell cycle regulation between yeast and humans, leading to cancer therapeutic targets

• Drug discovery platforms:

  • Screening compounds that affect SPCC16C4.20c function or interactions

  • Using the antibody to monitor effects of potential therapeutic agents on protein levels or modifications

  • Developing assays similar to those used in drug discovery for human CDK inhibitors, which originated from yeast cell cycle research

• Biomarker potential:

  • If human orthologs show altered expression or modification in disease states

  • Development of diagnostic antibodies based on insights from S. pombe research

• Methods development:

  • Optimization of antibody-based techniques in S. pombe can inform development of similar approaches in more complex systems

  • Protocols established for this antibody could be adapted for related proteins in human cells