VPS64 Antibody

What is VPS64 Antibody and what is its target protein's function?

VPS64 Antibody is a research-grade immunological reagent designed to detect and bind to VPS64 protein, which plays a role in vesicular transport and protein sorting in yeast cells. The antibody reacts specifically with Saccharomyces cerevisiae (strain ATCC 204508 / S288c), commonly known as Baker's yeast . The target protein is encoded by the YDR200C gene in S. cerevisiae and is cataloged in the KEGG database (sce:YDR200C) and STRING database (4932.YDR200C) .

VPS64 belongs to the broader family of vacuolar protein sorting (VPS) proteins, which are involved in the trafficking of proteins from the Golgi apparatus to the vacuole. Understanding the function of VPS proteins is crucial for fundamental cell biology research, particularly in studies of membrane trafficking and protein degradation pathways.

What are the common applications for VPS64 Antibody in yeast research?

VPS64 Antibody has several primary applications in yeast research:

• Western Blotting (WB): For detecting and quantifying VPS64 protein levels in yeast cell lysates

• ELISA: For quantitative assessment of VPS64 in sample preparations

• Protein localization studies: For determining the subcellular distribution of VPS64

• Immunoprecipitation: For isolating VPS64 and its binding partners

• Functional studies: For investigating the role of VPS64 in vesicular transport

These applications are particularly valuable for researchers studying protein trafficking, organelle biogenesis, and cellular stress responses in yeast models.

How does VPS64 differ from the more commonly studied VPS4 protein?

While VPS64 and VPS4 are both members of the vacuolar protein sorting family, they have distinct functions and properties:

VPS4 is more extensively studied and has broader commercial antibody availability, likely due to its conservation in humans and potential relevance to human diseases. VPS4 functions in the ESCRT (Endosomal Sorting Complex Required for Transport) pathway and plays a role in multivesicular body formation and viral budding .

What are the optimal protocols for using VPS64 Antibody in Western blot experiments?

For optimal Western blot results with VPS64 Antibody, researchers should consider the following protocol guidelines:

• Sample preparation:

  • Harvest yeast cells during logarithmic growth phase

  • Lyse cells using glass beads or enzymatic methods in a buffer containing protease inhibitors

  • Clear lysates by centrifugation (14,000 × g for 10 minutes)

• SDS-PAGE and transfer:

  • Load 20-50 μg total protein per lane

  • Use 10-12% polyacrylamide gels for optimal separation

  • Transfer to PVDF membrane at 100V for 1 hour or 30V overnight

• Antibody incubation:

  • Block membrane with 5% non-fat dry milk in TBST for 1 hour

  • Incubate with VPS64 primary antibody at 1:500-1:1000 dilution overnight at 4°C

  • Wash 3× with TBST

  • Incubate with appropriate secondary antibody (typically HRP-conjugated) at 1:5000 dilution for 1 hour

  • Wash 3× with TBST

• Detection:

  • Use enhanced chemiluminescence (ECL) reagents

  • Expose to X-ray film or document using a digital imaging system

For validation, always include positive controls (wild-type yeast extract) and negative controls (vps64Δ mutant extract) to confirm antibody specificity.

How can researchers optimize VPS64 Antibody performance in ELISA assays?

To maximize sensitivity and specificity in ELISA assays with VPS64 Antibody:

• Plate preparation:

  • Coat high-binding 96-well plates with capture antibody (1-10 μg/ml) in carbonate buffer (pH 9.6) overnight at 4°C

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

  • Block with 1-5% BSA in PBS for 1-2 hours at room temperature

• Sample incubation:

  • Prepare yeast lysates in dilution buffer (typically PBS with 0.5% BSA)

  • Apply serial dilutions of samples and standards

  • Incubate for 2 hours at room temperature or overnight at 4°C

  • Wash 4× with PBST

• Detection optimization:

  • Use VPS64 Antibody at titrated concentrations (typically 0.5-2 μg/ml)

  • Incubate for 1-2 hours at room temperature

  • Wash 4× with PBST

  • Apply HRP-conjugated secondary antibody or use directly conjugated detection antibody

  • Develop with TMB substrate and measure absorbance at 450 nm

• Assay validation:

  • Include multiple concentrations of purified recombinant VPS64 protein as standards

  • Run VPS64-knockout samples as negative controls

  • Perform recovery experiments by spiking known amounts of antigen

What controls should be included when conducting immunofluorescence with VPS64 Antibody?

When performing immunofluorescence studies with VPS64 Antibody in yeast cells, researchers should include the following controls:

• Positive controls:

  • Wild-type S. cerevisiae expressing VPS64 at normal levels

  • Cells overexpressing tagged VPS64 (e.g., GFP-VPS64)

• Negative controls:

  • vps64Δ knockout strain

  • Secondary antibody-only control (omitting primary antibody)

  • Isotype control (irrelevant primary antibody of same isotype)

• Specificity controls:

  • Peptide competition assay (pre-incubation of antibody with immunizing peptide)

  • Cross-reactivity assessment with related VPS proteins

  • Co-localization with known compartment markers (e.g., vacuole, endosome)

• Technical controls:

  • Unstained cells (autofluorescence control)

  • Single-color controls for spectral compensation

  • Fixation control (different fixation methods may affect epitope accessibility)

How can VPS64 Antibody be used to study protein-protein interactions in vesicular transport pathways?

VPS64 Antibody can be strategically employed to investigate protein-protein interactions within vesicular transport pathways through several advanced techniques:

• Co-immunoprecipitation (Co-IP):

  • Use VPS64 Antibody coupled to protein A/G beads or magnetic beads

  • Apply to yeast lysates prepared with gentle detergents (0.1% NP-40 or digitonin)

  • Analyze precipitated complexes by mass spectrometry or Western blotting

  • Cross-validate interactions with reciprocal Co-IPs

• Proximity-based labeling:

  • Express VPS64 fused to enzymes like BioID or APEX2

  • Use VPS64 Antibody to confirm proper expression and localization

  • Identify proximal proteins through streptavidin pulldown or other relevant methods

• Fluorescence microscopy techniques:

  • Combine VPS64 Antibody with antibodies against potential interacting partners

  • Analyze co-localization using high-resolution techniques (STED, SIM)

  • Perform FRET analysis to detect direct protein-protein interactions

  • Use live-cell imaging to track dynamic interactions

• Split-reporter assays:

  • Design constructs where VPS64 and potential partners are fused to complementary reporter fragments

  • Use VPS64 Antibody to verify expression levels

  • Measure reporter activity as indicator of protein interaction

These methods can reveal VPS64's role in multiprotein complexes involved in vesicular trafficking, providing mechanistic insights into yeast membrane biology.

What approaches can be used to validate the specificity of VPS64 Antibody?

Rigorous validation of VPS64 Antibody specificity is crucial for reliable research outcomes. Researchers should consider implementing these validation strategies:

• Genetic validation:

  • Compare antibody staining/binding between wild-type and vps64Δ mutant strains

  • Use strains with tagged VPS64 to confirm co-localization with antibody staining

  • Employ inducible expression systems to correlate signal with expression level

• Biochemical validation:

  • Perform peptide competition assays with immunizing peptide

  • Test cross-reactivity with recombinant proteins of related VPS family members

  • Use purified recombinant VPS64 as a positive control

  • Assess antibody performance across multiple applications (WB, ELISA, IP)

• Immunodepletion studies:

  • Pre-clear samples with VPS64 Antibody to remove antigen

  • Analyze depleted samples to confirm absence of target protein

  • Use sequential immunoprecipitation to assess antibody efficiency

• Orthogonal methods:

  • Correlate antibody results with mRNA expression data

  • Compare with results using alternative antibodies against different epitopes

  • Validate subcellular localization with fluorescently tagged proteins

Rigorous validation ensures that experimental observations truly reflect VPS64 biology rather than artifacts or cross-reactivity .

How does VPS64 Antibody perform in detecting post-translational modifications of the target protein?

Detection of post-translational modifications (PTMs) of VPS64 requires careful consideration of antibody characteristics and experimental design:

For comprehensive PTM analysis:

• Enrich for modified forms through techniques like phosphopeptide enrichment or ubiquitin pulldown

• Use the VPS64 Antibody for Western blotting

• Compare with specific PTM antibodies when available

• Consider mass spectrometry as a complementary approach for unbiased PTM identification

Remember that standard VPS64 Antibody may not distinguish between modified and unmodified forms unless specifically designed to recognize a particular PTM.

What are common issues encountered when using VPS64 Antibody and how can they be resolved?

Researchers may encounter several challenges when working with VPS64 Antibody. Here are common issues and their solutions:

• Weak or no signal in Western blot:

  • Increase antibody concentration or incubation time

  • Optimize protein extraction method to ensure target preservation

  • Use alternative membrane types (PVDF vs. nitrocellulose)

  • Try different blocking agents (BSA vs. milk)

  • Enhance signal with more sensitive detection systems

  • Confirm target protein expression in your experimental system

• High background in immunofluorescence:

  • Increase blocking time/concentration

  • Use alternative blocking agents (normal serum matching secondary antibody species)

  • Reduce primary antibody concentration

  • Include additional washing steps

  • Use centrifugation to clear antibody solutions before use

  • Optimize fixation protocol to maintain epitope accessibility while reducing autofluorescence

• Unexpected bands in Western blot:

  • Include wild-type and knockout controls

  • Use freshly prepared samples with protease inhibitors

  • Try reducing/non-reducing conditions

  • Perform peptide competition assay to identify specific bands

  • Consider the presence of protein isoforms or degradation products

• Poor reproducibility:

  • Standardize lysate preparation methods

  • Maintain consistent antibody lot numbers when possible

  • Document detailed protocols including incubation times/temperatures

  • Standardize image acquisition parameters

  • Use internal loading controls consistently

How can researchers adapt protocols for VPS64 Antibody use in different yeast species?

When adapting VPS64 Antibody for use in non-S. cerevisiae yeast species, researchers should consider:

• Sequence homology assessment:

  • Perform sequence alignment of VPS64 homologs across species

  • Determine conservation of the epitope region recognized by the antibody

  • Predict cross-reactivity based on epitope conservation

• Protocol modifications for different yeast species:

  • Adjust cell wall digestion methods based on species-specific cell wall composition

  • Modify lysis buffers to account for differences in protein expression levels

  • Optimize antibody concentration for each species

  • Adjust incubation times and temperatures

• Validation in new species:

  • Use tagged versions of the protein as positive controls

  • Perform knockout controls where possible

  • Consider testing antibodies raised against conserved regions

  • Validate by mass spectrometry identification of immunoprecipitated proteins

• Species-specific considerations:

  • For Schizosaccharomyces pombe: More stringent cell lysis conditions may be required

  • For Candida albicans: Consider the diploid nature when creating controls

  • For industrial yeasts: Account for potential strain-specific variations in protein sequence

How does fixation method impact VPS64 Antibody performance in immunofluorescence studies?

The choice of fixation method significantly impacts VPS64 Antibody performance in immunofluorescence applications:

Optimization recommendations:

• Test multiple fixation methods in parallel

• For formaldehyde fixation, include a permeabilization step with 0.1% Triton X-100

• Consider antigen retrieval techniques for formaldehyde-fixed samples

• For challenging applications, try progressive lowering of temperature (PLT) fixation

• Document fixation conditions thoroughly for reproducibility

How can VPS64 Antibody be integrated into high-throughput screening approaches?

VPS64 Antibody can be effectively incorporated into high-throughput screening (HTS) platforms to study vesicular trafficking and protein sorting:

• Automated microscopy platforms:

  • Use VPS64 Antibody in fixed-cell immunofluorescence assays in 96/384-well formats

  • Develop image analysis algorithms to quantify VPS64 localization, intensity, and distribution patterns

  • Screen chemical or genetic libraries for factors affecting VPS64 function

  • Combine with other markers to assess impact on vesicular transport pathways

• Flow cytometry applications:

  • Develop intracellular staining protocols for VPS64 detection

  • Use fluorescently tagged VPS64 reporter constructs validated with antibody

  • Implement high-throughput flow cytometry to screen thousands of conditions

  • Combine with viability markers to assess functional consequences

• Protein-protein interaction screens:

  • Adapt antibody for proximity ligation assays (PLA) to detect protein interactions

  • Use in array-format co-immunoprecipitation followed by protein microarray detection

  • Implement for validating yeast two-hybrid or BioID screen results in higher throughput

• Assay development considerations:

  • Optimize signal-to-background ratio for automated detection

  • Implement robust positive and negative controls on each plate

  • Validate with known modulators of vesicular trafficking

  • Consider fixation and permeabilization protocols compatible with automation

What are the emerging applications of computational approaches in predicting and designing VPS64 Antibody specificity?

Recent advances in computational biology are revolutionizing antibody research, with implications for VPS64 Antibody development and application:

• Biophysics-informed modeling for antibody specificity:

  • Machine learning approaches can predict antibody binding characteristics based on sequence information

  • Models trained on experimental data can distinguish multiple binding modes associated with particular ligands

  • These approaches enable the design of antibodies with customized specificity profiles

  • For VPS64 research, this could yield antibodies that specifically recognize particular conformational states

• Epitope prediction and optimization:

  • Structural modeling of VPS64 can identify accessible epitopes

  • Computational tools can predict which epitopes will yield antibodies with desired properties

  • This enables rational design of immunogens for generating new VPS64 antibodies

  • Machine learning approaches can disentangle binding modes even for chemically similar ligands

• Cross-reactivity assessment:

  • Computational tools can predict potential cross-reactivity with related proteins

  • Algorithms trained on high-throughput sequence data can identify specificity-determining residues

  • This allows researchers to select antibodies with minimal off-target binding

  • For yeast studies, this is particularly valuable given the presence of multiple related VPS proteins

• Integration with structural data:

  • Molecular dynamics simulations can predict epitope accessibility in different protein conformations

  • Computational docking can model antibody-antigen interactions

  • These approaches allow selection of antibodies targeting functionally relevant epitopes

  • For VPS64, this could help develop conformation-specific antibodies that distinguish active states

The combination of biophysics-informed modeling and extensive selection experiments offers powerful tools for designing antibodies with desired physical properties beyond what is possible with traditional experimental approaches alone .

How can VPS64 Antibody be used in studies of vesicular trafficking disorders?

VPS64 Antibody can serve as a valuable tool in investigating vesicular trafficking disorders through several methodological approaches:

• Model system applications:

  • Use yeast as a model organism to study conserved trafficking mechanisms

  • Apply VPS64 Antibody to track changes in protein localization and abundance

  • Correlate findings with mammalian homologs involved in disease states

  • Implement genetic manipulations (mutations, deletions) of VPS64 that mirror human disease variants

• Comparative studies across species:

  • Use VPS64 Antibody in cross-species studies where the epitope is conserved

  • Compare vesicular trafficking mechanisms between yeast and higher eukaryotes

  • Identify conserved interaction partners and regulatory mechanisms

  • Translate findings to mammalian cell culture models

• Disease-relevant phenotype assessment:

  • Monitor changes in VPS64 localization under stress conditions

  • Assess impact of disease-associated mutations on VPS64 function

  • Quantify protein-protein interactions in normal versus disease states

  • Screen for compounds that restore normal VPS64 function in disease models

• Integrative approaches:

  • Combine antibody-based detection with live-cell imaging of fluorescently tagged proteins

  • Correlate biochemical findings with functional assays of vesicular transport

  • Integrate with proteomic and genomic data to build comprehensive models of trafficking defects

  • Use in systems biology approaches to map perturbations in trafficking networks

What methodological considerations apply when using VPS64 Antibody in combination with other protein markers?

When utilizing VPS64 Antibody alongside other protein markers for multiplexed analysis, researchers should consider these methodological aspects:

• Antibody compatibility planning:

  • Ensure primary antibodies are from different host species to avoid cross-reactivity

  • If antibodies are from the same species, use directly conjugated antibodies or sequential staining protocols

  • Test for potential cross-reactivity between secondary antibodies

  • Validate specificity of each antibody individually before combining

• Multiplexed immunofluorescence optimization:

  • Balance signal intensities across different channels

  • Implement appropriate controls for spectral overlap

  • Consider order of antibody application (typically less abundant proteins first)

  • Optimize fixation and permeabilization to preserve all target epitopes

• Co-localization analysis techniques:

  • Use appropriate statistical methods (Pearson's correlation, Manders' coefficient)

  • Implement deconvolution or super-resolution techniques for precise localization

  • Account for differences in signal intensity when interpreting results

  • Consider three-dimensional analysis when appropriate

• Sequential immunoblotting considerations:

  • Test antibody stripping efficiency between probes

  • Consider size differences between target proteins for multiplexed detection

  • Use differently colored detection systems for simultaneous imaging

  • Include loading controls appropriate for each target protein

How does the experimental design for VPS64 Antibody applications differ between genetic and pharmacological intervention studies?

The application of VPS64 Antibody requires distinct experimental approaches when studying genetic versus pharmacological interventions:

Key methodological recommendations:

• For genetic studies:

  • Include time-course analyses to distinguish direct from adaptive effects

  • Consider using conditional mutants (temperature-sensitive, auxin-inducible) for acute depletion

  • Validate phenotypes with multiple independent mutant strains

• For pharmacological studies:

  • Establish compound toxicity profiles to separate specific from non-specific effects

  • Implement time-resolved imaging to capture dynamic responses

  • Consider target validation using resistant mutants or overexpression strains

• For integrated approaches:

  • Use genetic mutations to validate compound specificity

  • Employ chemical-genetic profiling to identify synergistic interactions

  • Combine with structural studies to understand compound binding modes

This methodological framework enables rigorous investigation of VPS64 function and regulation using complementary experimental approaches.