SPAC26H5.09c Antibody

What is SPAC26H5.09c and why would researchers develop antibodies against it?

SPAC26H5.09c is a gene in Schizosaccharomyces pombe (fission yeast) that encodes an oxidoreductase involved in NADPH regeneration. This protein has been implicated in the pentose phosphate pathway and oxidative stress responses. It attracts scientific interest because:

• It is upregulated in Δphx1 mutants, suggesting it plays a role in cellular responses to oxidative stress conditions .

• It has been linked to the transcriptional response to oxygen deprivation, categorized under electron transport functional groups .

• Its expression changes correlate with metabolic shifts in fission yeast, particularly under stress conditions .

Antibodies against SPAC26H5.09c enable researchers to study its expression levels, protein interactions, and subcellular localization, providing insights into stress response mechanisms in eukaryotic cells.

What experimental applications are SPAC26H5.09c antibodies suitable for?

Based on available research protocols using similar yeast protein antibodies, SPAC26H5.09c antibodies can be applied to:

• Western blotting for protein expression analysis

• Immunoprecipitation for protein-protein interaction studies

• Chromatin immunoprecipitation (ChIP) for studying potential interactions with DNA

• Immunofluorescence microscopy for subcellular localization

Protocol example for Western blotting with yeast protein antibodies:

• Collect yeast cells (1 × 10^8) growing exponentially

• Extract proteins under denaturing conditions

• Separate proteins using SDS-PAGE

• Transfer to PVDF membranes

• Block and incubate with primary antibody (anti-SPAC26H5.09c)

• Detect using enhanced chemiluminescence or infrared imaging systems

How should SPAC26H5.09c antibodies be stored and handled for optimal performance?

Optimal storage and handling of SPAC26H5.09c antibodies, similar to other research antibodies, typically includes:

• Store at -20°C for short-term or -80°C for long-term storage

• Avoid repeated freeze-thaw cycles that can denature the antibody

• Working aliquots can be stored at 4°C for up to one month

• Most antibodies are supplied in PBS buffer (pH 7.4) with sodium azide (0.05%) as a preservative

• Follow manufacturer's guidelines for specific concentrations when using in different applications

Antibodies typically maintain activity for at least 6-12 months when properly stored. For SPAC26H5.09c antibodies specifically, refer to product documentation from suppliers such as CUSABIO (product code CSB-PA522618XA01SXV) .

What controls should be included when using SPAC26H5.09c antibodies?

Proper experimental controls are crucial for antibody-based experiments:

Positive controls:

• Protein extracts from wild-type S. pombe strains

• Recombinant SPAC26H5.09c protein (if available)

Negative controls:

• Protein extracts from SPAC26H5.09c deletion mutants

• Secondary antibody-only controls to assess non-specific binding

• Pre-immune serum controls

Loading/transfer controls:

• Total protein staining with Ponceau S for Western blots

• Housekeeping proteins like actin (act1+) as internal references

As demonstrated in similar research on S. pombe proteins, specificity should be validated by confirming loss of immunoreactivity in gene deletion strains .

How can I validate the specificity of SPAC26H5.09c antibodies for my experimental system?

Comprehensive validation of SPAC26H5.09c antibodies should include:

Genetic validation:

• Compare immunoreactivity between wild-type and SPAC26H5.09c deletion strains

• Use CRISPR/Cas9 (where appropriate) to create knockout controls

• Test in strains with induced overexpression of SPAC26H5.09c

Biochemical validation:

• Peptide competition assays to confirm epitope specificity

• Mass spectrometry analysis of immunoprecipitated proteins

• Western blot analysis showing a single band of expected molecular weight

• Purification of the antigen with an N-terminal polyhistidine tag for affinity validation

Cross-platform validation:

• Compare results across multiple detection methods (Western blot, immunofluorescence)

• Use orthogonal methods (such as mRNA analysis by RT-qPCR) to correlate with protein levels

Following established validation frameworks like the one proposed by Uhlen et al. (2016) can ensure antibody reliability and reproducibility .

What methodological approaches enable detection of changes in SPAC26H5.09c expression under various stress conditions?

SPAC26H5.09c expression changes under various stresses, particularly oxidative stress:

Oxygen deprivation protocols:

• Culture cells in an InVivo hypoxic work station to controlled oxygen levels

• Harvest cells at specific timepoints and perform protein extraction

• Analyze SPAC26H5.09c levels using validated antibodies

• Include appropriate stress markers as positive controls

Quantitative analysis methods:

• Perform Western blots with equal protein loading (verified by BCA protein assay)

• Use infrared imaging systems (like Odyssey CLx) for quantification

• Normalize to loading controls

• Compare expression levels across different conditions (e.g., normoxia vs. hypoxia)

Experimental design considerations:

• Include time-course experiments to capture dynamic expression changes

• Test multiple stress conditions (oxidative, heat, nutrient deprivation)

• Correlate with functional assays to understand biological significance

• Analyze in both wild-type and relevant mutant strains (e.g., Δphx1, Δsre1)

Research shows SPAC26H5.09c is induced as part of the oxidative stress response and may be regulated by transcription factors like Phx1 .

How can I optimize SPAC26H5.09c antibody-based experiments when studying protein complexes?

When investigating SPAC26H5.09c in protein complexes:

Co-immunoprecipitation optimization:

• Consider using gentle lysis buffers to preserve native protein interactions

• Test different detergent concentrations to balance solubilization with complex preservation

• Optimize salt concentrations (typically 100-150mM) to maintain specific interactions

• Include protease and phosphatase inhibitors to prevent degradation

• Apply appropriate controls including IgG and pre-immune serum

Cross-linking approaches:

• Use reversible crosslinking agents (e.g., DSP, formaldehyde) to stabilize transient interactions

• Optimize crosslinking time and concentration to prevent over-crosslinking

• Ensure complete reversal of crosslinks before SDS-PAGE analysis

Advanced complex analysis:

• Consider Blue Native PAGE to maintain native complexes

• Employ size exclusion chromatography to separate complexes by size

• Implement mass spectrometry for comprehensive interaction partner identification

Protein complex research technologies particularly relevant include:

• Affinity-purification mass spectrometry

• Cross-linking mass spectrometry

• Native mass spectrometry

What are the main technical challenges and troubleshooting strategies for SPAC26H5.09c antibody experiments?

Common technical challenges:

Advanced troubleshooting approaches:

• Epitope retrieval techniques for fixed samples

• Optimization of antibody concentration through titration experiments

• Use of specialized blocking agents for problematic samples

• Implementation of automated western blot systems for consistency

Reference negative controls using deletion strains as demonstrated with other S. pombe proteins to confirm signal specificity .

How can I quantitatively assess SPAC26H5.09c protein levels across different experimental conditions?

Quantitative methods for SPAC26H5.09c protein analysis:

• Quantitative Western blotting:

  • Use infrared fluorescent secondary antibodies

  • Include standard curves with recombinant protein

  • Apply densitometry software for analysis

  • Normalize to total protein or housekeeping proteins

  • Report relative fold changes between conditions

• ELISA-based quantification:

  • Develop sandwich ELISA using anti-SPAC26H5.09c antibodies

  • Include standard curves

  • Optimize sample dilutions to ensure measurements within linear range

  • Calculate absolute protein concentrations

• Flow cytometry (if examining single cells):

  • Fix and permeabilize cells

  • Incubate with fluorophore-conjugated anti-SPAC26H5.09c antibody

  • Calculate mean fluorescence intensity

  • Compare populations across conditions

• Image-based quantification:

  • Use immunofluorescence microscopy

  • Apply consistent acquisition parameters

  • Analyze with specialized software for intensity measurement

  • Normalize to cell area or nuclear markers

Data analysis considerations:

• Apply appropriate statistical tests based on experimental design

• Report biological and technical replicates separately

• Consider using fold-change relative to control rather than absolute values

• Correlate protein levels with functional or phenotypic outcomes

Researchers have successfully quantified similar S. pombe proteins by incorporating multiple technical replicates and biological replicates to ensure statistical robustness .

What considerations should be made when investigating SPAC26H5.09c in relation to oxidative stress pathways?

SPAC26H5.09c has been implicated in oxidative stress response in S. pombe:

Experimental design considerations:

• Stress induction protocols:

  • H₂O₂ treatment at defined concentrations (typically 0.2-1mM)

  • Menadione for superoxide generation

  • Hypoxia/reoxygenation models

  • Nitrogen starvation to induce metabolic stress

• Related pathway components to monitor:

  • Other oxidative stress genes (sod1+, srx1+)

  • Glucose transporters (ght3+, ght4+, ght5+, ght8+) that are co-regulated

  • Pentose phosphate pathway components (zwf1+/SPAC3C7.13c)

  • Transcription factors like Phx1 that may regulate SPAC26H5.09c

• Functional assessments:

  • ROS measurements using DCFH-DA

  • Protein carbonylation analysis with anti-DNP antibodies

  • Cell viability assays to correlate with stress response

  • Metabolic profiling to assess NADPH production

• Genetic approach integration:

  • Analyze SPAC26H5.09c in wild-type vs. stress response mutants

  • Create double mutants to investigate pathway interactions

  • Perform rescue experiments with SPAC26H5.09c overexpression

Research indicates that SPAC26H5.09c is induced in Δphx1 mutants potentially as a response to increased oxidative stress, suggesting it plays a protective role in NADPH regeneration to combat oxidative damage .