Recombinant Bovine Transmembrane protein C9orf91 homolog

What is Transmembrane protein C9orf91 homolog and what is known about its function?

Transmembrane protein C9orf91 homolog (TMEM268) is a protein of approximately 342 amino acids with multiple transmembrane domains. This protein belongs to the domain of unknown function DUF4481, with the functional region located between amino acids 37 and 328 . Despite being conserved across species from fruit flies to mammals, its precise cellular function remains largely uncharacterized .

The protein contains two predicted transmembrane regions at positions 104-125 and 130-152, suggesting it may function in cellular membrane transport, signaling, or structural organization . Cross-species analyses indicate no identified paralogs within humans, zebrafish, or fruit flies, suggesting that TMEM268 may serve a unique functional role that has been conserved throughout evolution .

How should recombinant C9orf91 homolog be stored and handled for optimal stability?

For optimal stability and activity, recombinant C9orf91 homolog should be handled according to the following guidelines:

Prior to use, the vial should be briefly centrifuged to bring contents to the bottom . Repeated freeze-thaw cycles should be strictly avoided as they can lead to protein denaturation and loss of activity . When working with the reconstituted protein, maintaining sterile conditions is essential to prevent bacterial contamination.

What proteogenomic approaches can be used to identify SNPs and mutations in bovine C9orf91 homolog?

Proteogenomic analysis of C9orf91 homolog can be conducted using a systematic approach that integrates both genomic and proteomic data:

• Mass Spectrometry-Based Analysis:

  • Collect unassigned tandem mass spectra from high-resolution mass analyzers using HCD fragmentation method

  • Merge unassigned spectra into peaklist files for specialized database searches

  • Apply search engines like SEQUEST and MASCOT with appropriate false discovery rate controls (typically 1% FDR)

• Custom Database Construction:

  • Generate a customized protein database incorporating known and predicted SNPs from genomic databases

  • Include theoretical variant peptides resulting from documented mutations

  • Consider both synonymous and non-synonymous mutations that might affect peptide mass and fragmentation patterns

• Analysis Pipeline:

  • Identify spectra that do not match to the reference proteome

  • Search these spectra against the custom database containing variant sequences

  • Validate identified variants using orthogonal methods such as targeted mass spectrometry or genomic sequencing

This approach has been successfully applied to human chromosome 9 proteins and can be adapted for the bovine homolog, allowing researchers to identify potentially functional variants that might affect protein structure or function .

How can experimental design be optimized for studying C9orf91 homolog in drug discovery applications?

Optimization of experimental design for studying C9orf91 homolog in drug discovery requires a strategic approach to navigate the vast biological hypothesis space efficiently:

• Active Learning Frameworks:

  • Implement batch active learning algorithms to iteratively select the most informative experiments

  • Utilize prior knowledge from diverse information sources to guide experimental design

  • Apply reinforcement learning approaches to optimize exploration of the experimental space

• CRISPR-Based Intervention Studies:

  • Design genetic interventions targeting C9orf91 homolog and related pathways

  • Use multiplexed CRISPR screens to assess functional impacts across diverse cellular contexts

  • Establish clear causal associations between the protein and phenotypic outcomes

• Integrated Data Analysis:

  • Leverage standardized benchmarks like GeneDisco to evaluate experimental approaches

  • Incorporate multi-omics data to comprehensively characterize protein function

  • Apply machine learning models to extrapolate to unexplored areas of the experimental design space

The implementation of these approaches can significantly enhance the efficiency of experimental design, reducing resource requirements while maximizing valuable insights about C9orf91 homolog's potential as a drug target.

What expression systems are most effective for producing functional recombinant bovine Transmembrane protein C9orf91 homolog?

The selection of an appropriate expression system is critical for obtaining functional transmembrane proteins like C9orf91 homolog:

How can comparative genomics and proteomics be applied to characterize the evolutionary conservation and divergence of C9orf91 homologs?

Comparative analysis of C9orf91 homologs across species provides valuable insights into functional conservation and species-specific adaptations:

• Sequence Alignment and Phylogenetic Analysis:

  • Perform multiple sequence alignment of C9orf91 homologs from diverse species

  • Identify conserved domains and motifs that may indicate functional importance

  • Construct phylogenetic trees to visualize evolutionary relationships

  • Calculate sequence conservation scores to identify functionally critical regions

• Structural Prediction and Comparison:

  • Generate predicted structural models using tools like AlphaFold

  • Compare predicted transmembrane topologies across species

  • Identify conserved structural features that may indicate functional constraints

  • Map sequence variations onto structural models to assess potential functional impacts

• Expression Pattern Analysis:

  • Compare tissue-specific expression patterns across species

  • Identify conserved regulatory elements in promoter regions

  • Analyze co-expression networks to infer functional associations

  • Examine developmental expression patterns for evolutionary insights

Current evidence indicates that C9orf91 homologs are found in organisms ranging from insects to mammals, with no protein expression identified in organisms simpler than insects . This pattern of conservation suggests an important function that emerged with the evolution of complex multicellular organisms.

What are the key considerations for validating antibodies against bovine C9orf91 homolog?

Antibody validation is critical for ensuring specific detection of bovine C9orf91 homolog in experimental applications:

• Epitope Selection and Antibody Design:

  • Target unique, accessible regions of the protein (avoiding transmembrane domains)

  • Consider generating antibodies against both N-terminal and C-terminal regions

  • Evaluate cross-reactivity with homologs from other species

  • For monoclonal antibodies, characterize the specific epitope recognized

• Validation Methodology:

  • Perform Western blot analysis using recombinant protein as positive control

  • Confirm specificity using knockout/knockdown tissues or cells

  • Validate subcellular localization using immunofluorescence microscopy

  • Compare results from multiple antibodies targeting different epitopes

  • Perform immunoprecipitation followed by mass spectrometry to confirm target identity

• Application-Specific Validation:

  • For immunohistochemistry: optimize fixation conditions and antigen retrieval methods

  • For flow cytometry: establish appropriate permeabilization protocols for transmembrane proteins

  • For ChIP applications: verify chromatin accessibility and antibody performance in chromatin context

Thorough antibody validation is essential for generating reliable and reproducible results in studies of C9orf91 homolog.

What potential role might C9orf91 homolog play in disease pathways based on current evidence?

While the specific function of C9orf91 homolog remains to be fully characterized, several lines of evidence suggest potential roles in disease pathways:

• Cancer Associations:

  • Genes on chromosome 9 have been associated with various types of cancer, including lung cancer

  • Comparative proteomics between normal lung and lung cancer tissues has identified chromosome 9 proteins with differential expression

  • Some chromosome 9 proteins show cancer tissue-specific detection patterns

• Genetic Variation Analysis:

  • SNPs and mutations in chromosome 9 genes have been documented in cancer databases like COSMIC

  • Proteogenomic approaches have identified peptide evidence of these variations

  • These genetic alterations may contribute to disease mechanisms through altered protein function

• Structural and Functional Implications:

  • As a transmembrane protein, C9orf91 homolog may participate in cellular signaling or transport

  • Its evolutionary conservation suggests an important cellular function

  • The presence of multiple splice variants indicates potential for tissue-specific functions

Research exploring the specific role of bovine C9orf91 homolog in disease pathways would benefit from comparative studies with human and other mammalian homologs, particularly in contexts where chromosome 9 aberrations have been implicated in pathological processes.

What are the most promising research directions for elucidating the function of bovine C9orf91 homolog?

Based on current knowledge gaps and available research tools, several promising directions emerge for future investigation of bovine C9orf91 homolog:

• Systematic Interactome Analysis:

  • Perform proximity labeling (BioID, APEX) to identify interaction partners

  • Conduct co-immunoprecipitation followed by mass spectrometry

  • Investigate protein-protein interactions across different cellular compartments and conditions

• Advanced Functional Genomics:

  • Apply CRISPR-Cas9 knockout/knockin strategies to assess phenotypic consequences

  • Utilize tissue-specific conditional knockout models to address potential developmental lethality

  • Implement CRISPR interference/activation approaches to modulate expression levels

• Structural Biology Approaches:

  • Determine high-resolution structure using cryo-EM or X-ray crystallography

  • Investigate membrane topology and dynamics using NMR or hydrogen-deuterium exchange

  • Apply computational modeling to predict functional sites and ligand interactions

• Translational Research:

  • Explore association with bovine diseases and production traits

  • Investigate potential as a biomarker for specific pathological conditions

  • Assess cross-species conservation of function with implications for human health