SPBC1711.08 Antibody

What is SPBC17D11.08 and why is it studied in research?

SPBC17D11.08 is an uncharacterized WD repeat-containing protein found in Schizosaccharomyces pombe (fission yeast). WD repeat-containing proteins typically function as molecular scaffolds for protein-protein interactions, facilitating the assembly of large protein complexes. This particular protein is of interest to researchers studying basic cellular processes in yeast as a model organism. The SPBC17D11.08 gene has been assigned the NCBI GeneID 2539614 and is referenced by the UniProt Primary Accession number O74763 . Although classified as "uncharacterized," studying this protein contributes to our understanding of conserved cellular mechanisms that may have parallels in human biology, making it valuable for fundamental research in cellular and molecular biology.

What are the validated applications for the SPBC17D11.08 antibody?

The SPBC17D11.08 antibody has been validated for specific research applications including ELISA (Enzyme-Linked Immunosorbent Assay) and Western Blot (WB) analysis . These techniques allow researchers to detect and quantify the presence of the target protein in various sample preparations. When using this antibody for Western Blot applications, it's essential to ensure proper identification of the antigen through appropriate controls. Unlike some other antibodies such as the ErbB2/HER2 Antibody (9G6) which has been validated for a broader range of applications including immunoprecipitation (IP), immunofluorescence (IF), immunohistochemistry (IHC-P), and flow cytometry (FCM) , the SPBC17D11.08 antibody currently has a more limited range of validated applications, primarily focusing on protein detection rather than localization or functional studies.

What is the species reactivity profile of the SPBC17D11.08 antibody?

The SPBC17D11.08 antibody has been specifically developed for detection of proteins from Schizosaccharomyces pombe (strain 972/24843), commonly known as fission yeast . Unlike more broadly reactive antibodies such as the Goat Anti-Rabbit IgG(H+L) antibody which demonstrates cross-reactivity with multiple species , the SPBC17D11.08 antibody is highly specific to S. pombe proteins. This specificity makes it a valuable tool for researchers working specifically with this yeast model but limits its application in comparative studies across other species without extensive validation. When designing experiments involving multiple organisms, researchers should consider the limited cross-reactivity profile of this antibody and may need to source species-specific alternatives for comparative analyses.

How can the SPBC17D11.08 antibody be used to investigate protein-protein interactions in WD repeat protein complexes?

The SPBC17D11.08 antibody can serve as a powerful tool for investigating protein-protein interactions involving this WD repeat-containing protein. Advanced researchers should consider implementing co-immunoprecipitation (Co-IP) protocols, though these would require additional validation beyond the currently confirmed ELISA and Western Blot applications . To optimize Co-IP experiments, researchers could adapt methodologies similar to those used for other complex proteins, as demonstrated in studies of HIV-1 Nef protein interactions with Tec/Btk kinases . A suggested experimental approach would involve:

• Crosslinking protein complexes in vivo using membrane-permeable crosslinkers

• Cell lysis under non-denaturing conditions to preserve protein-protein interactions

• Immunoprecipitation using the SPBC17D11.08 antibody conjugated to agarose or magnetic beads

• Extensive washing to remove non-specific interactions

• Analysis of co-precipitated proteins via mass spectrometry or Western blotting

When analyzing results, researchers should be mindful that WD repeat proteins often form part of larger complexes that may be difficult to fully preserve during experimental manipulation, potentially requiring optimization of buffer conditions and crosslinking parameters.

What are the considerations for using SPBC17D11.08 antibody in comparative studies of WD repeat proteins across fungal species?

When employing the SPBC17D11.08 antibody for comparative studies across fungal species, researchers must address several critical considerations due to the high specificity of this antibody to S. pombe proteins . Advanced experimental designs should incorporate:

• Epitope conservation analysis: Perform bioinformatic sequence alignments of the immunogen region across target fungal species to predict potential cross-reactivity.

• Validation in each species: Conduct preliminary Western blots with positive and negative controls for each fungal species being studied.

• Recombinant protein standards: Express conserved domains as recombinant proteins to serve as validation standards.

• Competing peptide assays: Use synthetic peptides matching the epitope region to confirm specificity via competition assays.

Unlike broadly reactive antibodies such as those targeting conserved viral structures , species-specific antibodies like SPBC17D11.08 require rigorous validation for cross-species applications. Researchers might consider generating a phylogenetic analysis of WD repeat domain conservation across fungal species as a table to predict likely cross-reactivity patterns and guide experimental design. This approach would be similar to methodologies employed in studies of betacoronavirus antibodies, where epitope conservation dictates cross-reactivity .

How can quantitative proteomic approaches be integrated with SPBC17D11.08 antibody detection for functional studies?

Integrating quantitative proteomics with SPBC17D11.08 antibody detection enables comprehensive functional characterization of this WD repeat-containing protein. Advanced researchers should consider implementing:

When implementing these approaches, researchers should be mindful of maintaining similar methodological rigor as demonstrated in studies of other cellular proteins, such as those examining PKD1 biomarkers using urinary exosomes . Particular attention should be paid to appropriate negative controls, such as non-specific IgG precipitations, to distinguish genuine interactions from background binding.

What is the optimal protocol for using SPBC17D11.08 antibody in Western blot applications?

For optimal Western blot results with the SPBC17D11.08 antibody, researchers should follow this detailed protocol:

• Sample Preparation:

  • Harvest S. pombe cells in mid-log phase

  • Lyse cells using either glass bead disruption or enzymatic spheroplasting in a buffer containing 50 mM Tris-HCl pH 7.5, 150 mM NaCl, 1% NP-40, 0.5% sodium deoxycholate, with protease inhibitor cocktail

  • Clear lysates by centrifugation (14,000 × g, 15 min, 4°C)

• Gel Electrophoresis:

  • Separate 20-50 μg protein on 10-12% SDS-PAGE gels

  • Include molecular weight markers that span the expected size range of the target protein

• Transfer:

  • Transfer to PVDF membrane using semi-dry or wet transfer systems (100V for 1 hour or 30V overnight at 4°C)

• Blocking:

  • Block membrane with 5% non-fat dry milk in TBST (TBS + 0.1% Tween-20) for 1 hour at room temperature

• Primary Antibody Incubation:

  • Dilute SPBC17D11.08 antibody 1:1000 in 5% BSA in TBST

  • Incubate overnight at 4°C with gentle rocking

• Washing:

  • Wash 4 times with TBST, 5 minutes each

• Secondary Antibody:

  • Incubate with HRP-conjugated anti-rabbit IgG (similar to protocols used for other rabbit antibodies ) at 1:5000 dilution in blocking buffer for 1 hour at room temperature

• Detection:

  • Develop using enhanced chemiluminescence (ECL) substrate

  • Capture images using standard documentation systems

This protocol incorporates methodological considerations similar to those employed in Western blot applications for other complex proteins, such as those described for Blt1p in fission yeast cytokinesis studies , but with specific optimizations for the SPBC17D11.08 antibody based on its properties as a rabbit polyclonal antibody targeting a yeast protein.

How should researchers optimize ELISA protocols when using the SPBC17D11.08 antibody?

For optimal ELISA performance with the SPBC17D11.08 antibody, researchers should implement the following protocol with specific consideration of S. pombe sample preparation:

• Plate Coating:

  • Coat high-binding 96-well plates with 100 μl of capture antibody (anti-SPBC17D11.08) diluted to 1-10 μg/ml in carbonate-bicarbonate buffer (pH 9.6)

  • Incubate overnight at 4°C

• Blocking:

  • Block with 300 μl of 3% BSA in PBS for 2 hours at room temperature

  • Wash 3 times with PBST (PBS + 0.05% Tween-20)

• Sample Preparation:

  • For cell lysates: prepare S. pombe extracts using non-denaturing lysis buffers to preserve native protein structure

  • For purified protein: generate standard curves using recombinant SPBC17D11.08 if available

  • Perform serial dilutions in sample diluent (1% BSA in PBST)

• Sample Incubation:

  • Add 100 μl of samples and standards to appropriate wells

  • Incubate for 2 hours at room temperature with gentle shaking

  • Wash 5 times with PBST

• Detection:

  • For direct ELISA: Add HRP-conjugated secondary antibody (similar to applications described for other rabbit antibodies )

  • For sandwich ELISA: Add biotinylated detection antibody followed by streptavidin-HRP

  • Incubate for 1 hour at room temperature

  • Wash 5 times with PBST

• Visualization:

  • Add 100 μl TMB substrate and incubate for 15-30 minutes in the dark

  • Stop reaction with 100 μl 2N H₂SO₄

  • Read absorbance at 450 nm with 570 nm reference wavelength

This protocol incorporates optimization strategies similar to those employed in quality-tested ELISA applications for other antibodies , with specific considerations for the properties of the SPBC17D11.08 target protein in yeast samples.

What controls should be included when validating experimental results with the SPBC17D11.08 antibody?

Proper experimental validation with the SPBC17D11.08 antibody requires rigorous control implementation:

These control strategies align with rigorous validation approaches used for other research antibodies, such as those applied in studies of Zap70 catalytic activity during T cell development . Implementing these controls ensures experimental results with the SPBC17D11.08 antibody are both specific and reproducible, minimizing the risk of data misinterpretation due to antibody cross-reactivity or non-specific binding.

How can researchers troubleshoot weak or absent signals when using the SPBC17D11.08 antibody?

When encountering weak or absent signals with the SPBC17D11.08 antibody, researchers should systematically address potential issues:

• Protein Expression Verification:

  • Confirm SPBC17D11.08 expression in your specific strain and growth conditions using RT-PCR

  • Consider that expression levels might vary with growth phase or environmental stress

• Sample Preparation Optimization:

  • Evaluate different lysis buffers to ensure effective protein extraction

  • Test multiple protease inhibitor combinations to prevent degradation

  • For membrane-associated fractions, include specialized detergents like CHAPS or digitonin

• Antibody Titration and Incubation Conditions:

  • Test a range of antibody concentrations (0.1-10 μg/ml)

  • Extend primary antibody incubation time (overnight at 4°C vs. 2 hours at room temperature)

  • Try various blocking agents (BSA, non-fat milk, commercial blockers) to reduce background

• Signal Enhancement Strategies:

  • Implement signal amplification systems such as biotin-streptavidin

  • Use high-sensitivity detection substrates for Western blots

  • Consider immunoprecipitation to concentrate the target protein before detection

• Storage and Handling Assessment:

  • Verify antibody storage conditions (aliquoted, -20°C, minimal freeze-thaw cycles)

  • Check buffer composition for preservatives like sodium azide that may inhibit HRP

This methodological approach to troubleshooting incorporates strategies similar to those employed in research using other antibodies in challenging applications, such as detecting low-abundance proteins in complex biological samples .

What are the considerations for using SPBC17D11.08 antibody in immunofluorescence studies of S. pombe?

While the SPBC17D11.08 antibody has not been specifically validated for immunofluorescence (IF) applications , researchers interested in adapting it for this purpose should consider the following comprehensive approach:

• Fixation Method Selection:

  • Test multiple fixation protocols:

    • Formaldehyde (3.7%, 10 minutes) for general structure preservation

    • Methanol (-20°C, 6 minutes) for cytoskeletal proteins

    • Glutaraldehyde (0.1% with 3.7% formaldehyde) for membrane proteins

  • Evaluate impact of fixation on epitope accessibility

• Cell Wall Digestion Optimization:

  • Implement enzymatic spheroplasting with lysing enzymes or zymolyase

  • Carefully titrate enzyme concentration and digestion time

  • Consider temperature effects on digestion efficiency

• Permeabilization Parameters:

  • Test Triton X-100 (0.1-1%), saponin (0.1-0.5%), or digitonin (10-50 μg/ml)

  • Optimize permeabilization time to balance antibody access with structure preservation

• Signal Amplification:

  • Implement tyramide signal amplification if direct detection yields weak signals

  • Consider using biotinylated secondary antibodies with fluorescent streptavidin conjugates

  • Evaluate anti-fade mounting media to preserve signal during imaging

• Controls and Validation:

  • Include peptide competition controls

  • Compare with GFP-tagged SPBC17D11.08 expression if available

  • Use super-resolution microscopy to confirm subcellular localization patterns

This methodological approach draws upon practices established for other immunofluorescence applications in yeast and mammalian cells, similar to those described for studying protein localization in immunocytochemistry applications .

How can researchers assess potential cross-reactivity of the SPBC17D11.08 antibody with related WD repeat proteins?

To rigorously evaluate potential cross-reactivity of the SPBC17D11.08 antibody with other WD repeat proteins, researchers should implement a systematic assessment strategy:

• Bioinformatic Analysis:

  • Perform sequence alignment of the immunogen region against all S. pombe WD repeat proteins

  • Generate a homology table ranking potential cross-reactive proteins by epitope similarity

  • Model the 3D structure of epitope regions to identify structurally similar domains

• Experimental Validation:

  • Express recombinant forms of closely related WD repeat proteins

  • Conduct Western blot analysis against multiple WD repeat proteins simultaneously

  • Implement epitope mapping using peptide arrays or deletion constructs

• Genetic Approach:

  • Test antibody reactivity in strains with deletions of related WD repeat proteins

  • Create strains expressing epitope-tagged versions of related proteins

  • Conduct immunoprecipitation followed by mass spectrometry to identify all bound proteins

• Quantitative Assessment:

  • Calculate cross-reactivity ratios by comparing signal intensities

  • Determine binding affinities using surface plasmon resonance

  • Perform competition assays with purified related proteins

How might the SPBC17D11.08 antibody be utilized in studies of WD repeat protein evolution across fungal species?

The SPBC17D11.08 antibody presents unique opportunities for evolutionary studies of WD repeat proteins across fungal species, despite its current validation limited to S. pombe . Researchers interested in this direction should consider:

• Epitope Conservation Analysis:

  • Use bioinformatics to identify conserved epitopes across fungal WD repeat proteins

  • Design complementary antibodies targeting highly conserved regions

  • Develop a panel of species-specific and cross-reactive antibodies for comparative studies

• Functional Domain Mapping:

  • Compare immunoreactivity patterns with functional conservation

  • Correlate antibody binding with protein-protein interaction networks across species

  • Develop a functional domain map based on epitope accessibility in different species

• Evolutionary Proteomics Approach:

  • Combine antibody-based detection with mass spectrometry for interactome analysis

  • Compare WD repeat protein complexes across evolutionarily distinct fungi

  • Identify core conserved interactions versus species-specific adaptations

This approach would be conceptually similar to studies of convergent antibodies targeting conserved viral structures , but applied to the evolutionary biology of WD repeat proteins in fungi. Such research could reveal fundamental insights into the evolution of protein interaction networks and scaffold proteins across fungal phylogeny.

What emerging technologies could enhance research applications of the SPBC17D11.08 antibody?

Several cutting-edge technologies could significantly expand the research applications of the SPBC17D11.08 antibody:

• Proximity Labeling Technologies:

  • Conjugate the antibody to engineered peroxidases (APEX2) or biotin ligases (TurboID)

  • Map protein-protein interactions in native cellular environments

  • Identify transient interaction partners through temporal labeling studies

• Super-Resolution Microscopy Integration:

  • Adapt the antibody for STORM, PALM, or STED microscopy

  • Resolve subcellular localization at nanometer resolution

  • Track dynamic changes in protein distribution during cell cycle progression

• Single-Cell Proteomics Applications:

  • Develop protocols for antibody-based single-cell isolation

  • Combine with microfluidic systems for high-throughput analysis

  • Correlate protein expression with single-cell transcriptomics

• In situ Structural Biology:

  • Use the antibody for in-cell NMR studies

  • Develop protocols for proximity-dependent labeling combined with cryo-EM

  • Map conformational changes in the native cellular environment

This forward-looking perspective draws inspiration from emerging technologies in antibody applications similar to those being developed for other complex biological systems, such as novel fluorescent tracers for tumor visualization . By integrating these advanced technologies with the SPBC17D11.08 antibody, researchers could gain unprecedented insights into WD repeat protein function in yeast.