Protein: Putative serine/threonine protein phosphatase (NP_596646.1)
Function: Predicted to regulate phosphorylation-dependent signaling pathways, with homology to human protein phosphatase 4 (PP4) .
The SPBC26H8.05c antibody is critical for:
Functional Studies: Investigating cell cycle regulation, chromosome segregation, and stress response pathways in fission yeast .
Protein-Protein Interaction Analysis: Identifying binding partners like Ppk18 and Dis2 phosphatases .
Post-Translational Modification Studies: Detecting phosphorylation states in signaling cascades .
SPBC26H8.05c (Ppe2) collaborates with Ppk18 to ensure equal chromosome segregation during mitosis .
Depletion leads to hypersensitivity to microtubule-destabilizing agents, implicating its role in mitotic checkpoint control .
Validation Methods: Western blotting and immunoprecipitation confirmed specificity for the endogenous SPBC26H8.05c protein .
Cross-Reactivity: No reported cross-reactivity with other phosphatases (e.g., PP1, PP2A) in S. pombe .
KEGG: spo:SPBC26H8.05c
STRING: 4896.SPBC26H8.05c.1
SPBC26H8.05c is a protein found in Schizosaccharomyces pombe (fission yeast), identified by UniProt accession number O74789. This protein serves as an important research target in fundamental cellular biology studies, as fission yeast represents a well-established model organism for investigating eukaryotic cellular processes. The protein likely plays crucial roles in cellular pathways that are evolutionarily conserved across eukaryotes, making findings potentially applicable to understanding similar mechanisms in more complex organisms.
Research methodologies using this protein typically involve:
Genetic manipulation of the SPBC26H8.05c gene to study phenotypic effects
Protein-protein interaction studies to map cellular pathways
Localization studies to determine subcellular distribution
Functional assays to elucidate biological roles
SPBC26H8.05c Antibody is a polyclonal antibody raised in rabbits through immunization with recombinant Schizosaccharomyces pombe (strain 972/ATCC 24843) SPBC26H8.05c protein . Key properties include:
Antibody Class: Polyclonal IgG
Source Organism: Rabbit
Purification Method: Antigen affinity purified
Formulation: Liquid form containing 50% glycerol, 0.01M PBS (pH 7.4), with 0.03% Proclin 300 as preservative
Validated Applications: ELISA and Western Blot
Storage Requirements: -20°C or -80°C, with avoidance of repeated freeze-thaw cycles
Species Reactivity: Specific for Schizosaccharomyces pombe (strain 972/ATCC 24843)
The polyclonal nature means it contains a mixture of antibodies recognizing different epitopes on the target protein, potentially providing more robust detection but also requiring more thorough validation.
Optimizing Western Blot protocols with SPBC26H8.05c Antibody requires careful consideration of multiple parameters:
| Parameter | Recommended Method | Rationale |
|---|---|---|
| Sample Preparation | Extract proteins using non-denaturing buffers with protease inhibitors | Preserves native epitopes and prevents degradation |
| Protein Loading | 20-40 μg total protein per lane | Ensures detection of medium to low abundance proteins |
| Gel Percentage | 10-12% acrylamide | Optimal separation range for most yeast proteins |
| Transfer Conditions | Wet transfer at 100V for 1 hour or 30V overnight at 4°C | Complete transfer while maintaining protein integrity |
| Blocking Solution | 5% non-fat dry milk or BSA in TBST | Reduces non-specific binding |
| Primary Antibody Dilution | Initial test at 1:500, 1:1000, and 1:2000 | Determines optimal signal-to-noise ratio |
| Incubation Conditions | Overnight at 4°C with gentle agitation | Maximizes specific binding |
| Washing | 3 × 10 minutes with TBST | Removes unbound antibody |
| Detection Method | Enhanced chemiluminescence | Provides sensitivity for detection |
Essential controls include:
Positive control (wild-type S. pombe extract)
Negative control (extract from SPBC26H8.05c knockout strain, if available)
Loading control (antibody against housekeeping protein)
The verification should focus on confirming a single band of the expected molecular weight that disappears in knockout samples, which is crucial for establishing specificity .
Comprehensive validation of SPBC26H8.05c Antibody should include multiple complementary approaches:
| Validation Method | Experimental Design | Expected Outcome |
|---|---|---|
| Genetic Validation | Compare antibody reactivity between wild-type and SPBC26H8.05c knockouts | Signal present in wild-type; absent in knockout |
| Peptide Competition | Pre-incubate antibody with excess purified antigen | Significant reduction or elimination of signal |
| Western Blot Analysis | Run extracts from different cellular conditions | Single band of expected molecular weight |
| Cross-reactivity Assessment | Test against related yeast species | Signal specific to S. pombe, not in other species |
| Immunoprecipitation-MS | Pull down with antibody followed by mass spectrometry | SPBC26H8.05c as predominant identified protein |
| Orthogonal Detection | Compare with differently targeted antibody or tagged protein | Concordant results between methods |
"Each antibody must be verified based on the content of the product sheet, and subsequently through experimentation to confirm integrity, specificity and selectivity. Verification needs to focus on the precise application and tissue/cell type for which the antibody will be used, and all verification data must be reported openly."
For comprehensive multi-parameter studies, SPBC26H8.05c Antibody can be integrated through several methodological approaches:
Co-immunoprecipitation studies:
Use SPBC26H8.05c Antibody to pull down the target protein
Identify interaction partners through mass spectrometry
Validate interactions through reciprocal co-IP experiments
Multiplexed immunofluorescence:
Label SPBC26H8.05c Antibody with one fluorophore
Label antibodies against other proteins of interest with spectrally distinct fluorophores
Analyze co-localization patterns using confocal microscopy
ChIP-seq applications (if SPBC26H8.05c has DNA interactions):
Immunoprecipitate chromatin fragments using the antibody
Sequence pulled-down DNA to identify binding sites
Correlate with transcriptome data to identify regulated genes
Protein complex analysis:
Combine with Blue Native PAGE or gradient ultracentrifugation
Detect SPBC26H8.05c in specific protein complexes
Compare complex composition under different cellular conditions
"High-throughput sequencing can be achieved to rapidly and efficiently identify neutralizing antibodies with therapeutic and prophylactic effects." Similar approaches can be applied to study SPBC26H8.05c in cellular contexts.
Non-specific binding is a common challenge with antibodies that can be addressed through systematic optimization:
| Issue | Troubleshooting Approach | Scientific Rationale |
|---|---|---|
| High Background | Test alternative blocking agents (BSA, casein, commercial blockers) | Different blockers have varying efficacy depending on the sample type |
| Multiple Bands | Titrate antibody concentration (try 1:2000, 1:5000, 1:10000) | Reduces off-target binding while maintaining specific signal |
| Non-specific Signal | Increase washing stringency (0.1-0.5% Tween-20, higher salt) | Disrupts weak non-specific interactions |
| Cross-reactivity | Pre-adsorb antibody with acetone powder from related species | Removes antibodies that bind to conserved epitopes |
| Variable Results | Standardize protein extraction methods | Ensures consistent epitope presentation |
| False Positives | Include peptide competition controls | Confirms signal specificity |
"Manufacturers, vendors and scientists all share the responsibility to ensure the antibodies are fit for purpose." This collaborative approach to validation is essential for achieving reproducible results.
For proteins expressed at low levels, several methodological enhancements can significantly improve detection:
Sample Preparation Optimization:
Subcellular fractionation to concentrate the compartment containing SPBC26H8.05c
Immunoprecipitation to enrich the target protein prior to analysis
Use of specialized extraction buffers optimized for membrane or nuclear proteins
Signal Amplification Techniques:
Tyramide signal amplification (TSA) for immunohistochemistry or immunofluorescence
High-sensitivity chemiluminescent substrates for Western blot
Polymeric HRP detection systems that provide signal enhancement
Detection Technology Selection:
Cooled CCD camera systems for extended exposure imaging
Proximity ligation assay (PLA) for single-molecule detection
Mass spectrometry-based targeted proteomics approaches
"The required selectivity of the antibody is not only determined by the chosen antigen and the dilution/concentration of the antibody, but also by the intended application." Therefore, optimization must be application-specific.
SPBC26H8.05c Antibody can be modified for specialized applications through various chemical and biochemical approaches:
| Modification Type | Methodology | Research Application |
|---|---|---|
| Direct Conjugation | Coupling to fluorophores, enzymes, or biotin | Flow cytometry, direct detection without secondary antibody |
| Fragmentation | Pepsin or papain digestion to generate F(ab')2 or Fab fragments | Reduced background in tissues with high Fc receptor expression |
| Immobilization | Covalent coupling to solid supports (agarose, magnetic beads) | Affinity purification of SPBC26H8.05c and interacting partners |
| Cross-linking | Chemical cross-linking to target proteins using DSS, BS3, or formaldehyde | Capturing transient protein-protein interactions |
| Surface Functionalization | Attachment to biosensor surfaces | Real-time binding analysis using SPR or BLI |
"From 676 antigen-binding IgG1+ clonotypes, TOP10 sequences were selected for expression and characterization, with the most potent one, Abs-9, having nanomolar affinity for the pentameric form of the specific antigen." Similar approaches could be applied to develop improved SPBC26H8.05c detection reagents.
Maintaining experimental reproducibility requires systematic assessment of antibody batch variation:
Quantitative Performance Metrics:
Compare EC50 values in dose-response ELISA curves
Measure signal-to-noise ratios in Western blot applications
Determine binding affinity constants using surface plasmon resonance
Epitope Recognition Analysis:
Perform peptide array analysis to map recognized epitopes
Compare patterns between batches to identify recognition shifts
Conduct competition assays with defined peptide fragments
Standardized Reference Materials:
Maintain aliquots of well-characterized S. pombe extracts
Use recombinant SPBC26H8.05c protein as a standard
Include consistent positive and negative controls across experiments
"Unlike other types of reagents, most antibodies are not molecularly fully defined... and they are sold on the basis of claimed performance rather than physical identity." This reality necessitates rigorous batch testing.
A comprehensive control strategy is essential for ensuring result validity:
| Control Type | Implementation | Purpose |
|---|---|---|
| Positive Control | Wild-type S. pombe extract | Confirms antibody function |
| Negative Control | SPBC26H8.05c knockout extract or unrelated yeast species | Establishes specificity |
| Antibody Controls | No primary antibody; non-specific IgG | Identifies non-specific secondary antibody binding |
| Peptide Competition | Pre-incubation with immunizing peptide | Verifies epitope specificity |
| Loading Controls | Probing for housekeeping proteins | Normalizes for protein loading variations |
| Method Controls | Technical replicates; standard curves | Assesses method reproducibility |
| Sample Processing Controls | Identical processing of all samples | Eliminates preparation artifacts |
"Chemical fixation and subsequent antigen retrieval, as in IHC, can affect selectivity, depending on the epitope to be detected. Hence, the antibody performance depends on the quality of sample preparation." This highlights the importance of process controls.
The polyclonal nature of SPBC26H8.05c Antibody has specific methodological implications:
Broader Epitope Recognition:
More robust detection across varying experimental conditions
Less susceptible to single amino acid mutations or post-translational modifications
May recognize denatured protein more effectively than some monoclonals
Batch Variation Considerations:
New lots may have different epitope recognition profiles
Requires more extensive validation between batches
May necessitate maintaining reference standards from effective lots
Experimental Design Adaptations:
Include more extensive controls to confirm specificity
Consider parallel validation with orthogonal methods
May require affinity purification against recombinant protein for critical applications
"Polyclonal antibodies are molecularly undefined, but even hybridoma-derived monoclonal antibodies may have unpredictabilities." Understanding these characteristics is essential for robust experimental design.
Emerging single-cell methodologies offer exciting opportunities for SPBC26H8.05c research:
Single-Cell Proteomics Applications:
Mass cytometry (CyTOF) with metal-conjugated SPBC26H8.05c Antibody
Microfluidic antibody capture for quantitative single-cell analysis
Spatial proteomics using multiplexed antibody staining
Integrated Multi-Omics Approaches:
Combined antibody-based protein detection with transcriptomics
Correlation of SPBC26H8.05c protein levels with genetic variation
Temporal analysis of protein expression during cell cycle or differentiation
"High-throughput single-cell RNA and VDJ sequencing of memory B cells... can be achieved to rapidly and efficiently identify neutralizing antibodies with therapeutic and prophylactic effects." These approaches demonstrate how single-cell technologies are transforming immunological research and could similarly advance yeast protein studies.
Computational approaches to studying SPBC26H8.05c require specific methodological considerations:
Structural Modeling:
Implement AlphaFold2 or similar algorithms for protein structure prediction
Validate predicted structures through experimental approaches
Use molecular docking to predict protein-protein interactions
Network Analysis:
Integrate SPBC26H8.05c into protein interaction networks
Apply graph theory algorithms to identify functional modules
Correlate with phenotypic data to predict biological roles
Evolutionary Analysis:
Identify orthologs across species through sequence alignment
Analyze conservation patterns to predict functional domains
Construct phylogenetic trees to trace evolutionary relationships
"The 3D theoretical structures of Abs-9 and SpA5 were constructed using the website alphafold2 method. And then, the 3D complex structure of Abs-9 and SpA5 was obtained using molecular docking software." Similar approaches could be applied to understand SPBC26H8.05c structure and interactions.