OR4C16 Antibody

What is OR4C16 and what is its biological role?

OR4C16 (Olfactory receptor 4C16, also known as Olfactory receptor OR11-135) is a member of the G-protein coupled receptor 1 family with approximately 310 amino acids . It functions as an odorant receptor involved in the detection of specific odor molecules and triggers signals to the brain for olfactory processing . OR4C16 plays a significant role in the sensory perception of smell by binding to specific odor molecules and initiating signal transduction cascades through G-protein activation . Research on OR4C16 and similar olfactory receptors is crucial for understanding how the brain interprets and responds to different smells, potentially offering insights into neurological disorders related to olfactory dysfunction .

What applications are OR4C16 antibodies validated for?

OR4C16 antibodies have been validated for several key applications in molecular and cellular biology:

Scientific validation data for these applications often includes Western blot analysis of lysates from LOVO cells and SH-SY5Y cells, as well as immunofluorescence studies in A549 cells .

What is the typical source and format of commercially available OR4C16 antibodies?

Most commercially available OR4C16 antibodies are:

• Host species: Rabbit

• Clonality: Polyclonal

• Isotype: IgG

• Form: Liquid, typically in PBS buffer containing 50% glycerol, 0.5% BSA, and 0.02% sodium azide

• Available quantities: Usually 50-100 μg

• Purification method: Affinity-purified from rabbit antiserum using epitope-specific immunogen

What are the recommended storage conditions for OR4C16 antibodies?

For optimal performance and stability, OR4C16 antibodies should be:

• Shipped on wet ice or with ice packs

• Stored at -20°C or -80°C upon receipt

• Aliquoted to avoid repeated freeze-thaw cycles which can degrade antibody performance

• Some products contain 50% glycerol which helps maintain antibody stability during freezing

What controls should be included when using OR4C16 antibodies?

When designing experiments with OR4C16 antibodies, the following controls are essential:

• Negative controls: Pre-incubation of the antibody with the immunizing peptide has been shown to block signal in both Western blot and immunofluorescence applications, demonstrating specificity

• Positive controls: LOVO cells and SH SY5Y cells have been validated as expressing detectable levels of OR4C16 protein

• Loading controls: Standard housekeeping proteins should be used in Western blot applications

• Isotype controls: Rabbit IgG isotype controls (such as A82272 or A17360) can be used to assess non-specific binding

What are the optimal sample preparation methods for OR4C16 detection?

For Western blot:

• Cell lysates should be prepared using standard lysis buffers containing protease inhibitors

• The expected molecular weight of OR4C16 is approximately 34 kDa

• Denaturing conditions with SDS-PAGE are typically used

For immunofluorescence:

• A549 cells have been validated for immunofluorescence detection of OR4C16

• Standard fixation with 4% paraformaldehyde followed by permeabilization with 0.1-0.5% Triton X-100 is recommended

• Blocking with 1-5% BSA or normal serum before antibody incubation

What secondary antibodies and detection systems are recommended?

Compatible secondary antibodies for OR4C16 rabbit polyclonal antibodies include:

• Goat Anti-Rabbit IgG H&L Antibody (AP) (A294874)

• Goat Anti-Rabbit IgG H&L Antibody (Biotin) (A294795)

• Goat Anti-Rabbit IgG H&L Antibody (FITC) (A294887)

• Goat Anti-Rabbit IgG H&L Antibody (HRP) (A294888)

The choice of detection system depends on the application:

• For Western blot: HRP-conjugated secondary antibodies with chemiluminescent detection

• For immunofluorescence: Fluorophore-conjugated secondaries compatible with available microscopy systems

What is known about OR4C16 interaction partners and signaling pathways?

STRING database analysis reveals that OR4C16 has predicted functional interactions with several proteins involved in olfactory signal transduction:

These interactions suggest OR4C16 functions through classic G-protein coupled receptor signaling pathways, particularly those involving cAMP-dependent protein kinases .

What are the technical challenges in studying olfactory receptors like OR4C16?

Researchers face several challenges when studying OR4C16 and other olfactory receptors:

• Low expression levels: Olfactory receptors typically have low expression outside olfactory tissues

• Specificity validation: Due to the high sequence similarity between olfactory receptor family members, cross-reactivity must be carefully evaluated

• Functional assessment: Determining ligand specificity requires specialized assays

• Membrane protein challenges: As a seven-transmembrane domain protein, OR4C16 can be difficult to extract and maintain in native conformation

How can OR4C16 expression be modulated experimentally?

To study OR4C16 function through experimental manipulation:

• Overexpression systems:

  • Transfection of OR4C16 expression constructs in cell lines such as HEK293 or A549

  • Use of strong promoters (CMV, EF1α) for high expression

  • Addition of N-terminal signal sequences or rhodopsin tags to improve membrane trafficking

• Gene silencing approaches:

  • siRNA or shRNA targeting OR4C16

  • CRISPR-Cas9 gene editing for knockout studies

  • Antisense oligonucleotides

• Functional modulation:

  • Identification and application of specific odorant ligands

  • G-protein signaling modulators to assess downstream effects

What emerging research areas involve OR4C16?

While primarily known for its role in olfaction, research suggests olfactory receptors may have broader functions:

• Ectopic expression: Olfactory receptors including members of the OR4 family have been detected in non-olfactory tissues, suggesting potential novel functions

• Disease associations: Altered expression of olfactory receptors has been observed in certain pathological conditions

• Drug development: Understanding OR4C16 structure and function could potentially inform development of odor-based diagnostics or treatments

What are common issues in Western blot detection of OR4C16?

When performing Western blot analysis for OR4C16:

• Multiple bands: OR4C16 may show multiple bands due to post-translational modifications or splice variants. Blocking with immunizing peptide can help determine which bands are specific

• Weak signal: This may be addressed by:

  • Increasing antibody concentration (try 1:500 instead of 1:1000)

  • Extended incubation times (overnight at 4°C)

  • Enhanced detection systems

  • Increased protein loading

• High background: Can be reduced by:

  • More stringent washing

  • Increased blocking (3-5% BSA or milk)

  • Lower antibody concentration with longer incubation

How can immunofluorescence protocols be optimized for OR4C16 detection?

For optimal immunofluorescence results:

• Fixation optimization: Compare paraformaldehyde, methanol, and acetone fixation to determine which best preserves OR4C16 epitopes

• Permeabilization balance: As a membrane protein, excessive permeabilization may disrupt OR4C16 localization - titrate Triton X-100 concentrations (0.1-0.5%)

• Signal amplification: Consider tyramide signal amplification for low abundance targets

• Dilution optimization: Start with manufacturer recommended dilutions (1:100-1:500) and adjust as needed

How should results from different OR4C16 antibodies be compared and interpreted?

When using multiple OR4C16 antibodies or comparing results across studies:

• Epitope differences: Compare the immunogens used - antibodies targeting different regions of OR4C16 may give different results:

  • N-terminal targeting antibodies may detect truncated forms

  • C-terminal antibodies (such as PACO02690) target the C-terminal region

• Validation evidence: Assess the validation data available for each antibody, including:

  • Western blot band patterns

  • Immunofluorescence localization patterns

  • Controls used (peptide blocking, knockdown validation)

• Cross-validation: When possible, use multiple antibodies targeting different epitopes to confirm findings

How does research on OR4C16 connect to broader studies of sensory perception?

OR4C16 research contributes to our understanding of:

• Olfactory coding: How specific receptors recognize distinct odorants and translate this into neural signals

• GPCR signaling mechanisms: As a G-protein coupled receptor, findings may have relevance to other GPCR systems

• Sensory integration: How olfactory signals are processed and integrated with other sensory inputs

What technologies are emerging for studying olfactory receptors like OR4C16?

Advanced technologies enabling deeper study of OR4C16 include:

• Single-cell transcriptomics: Allowing precise characterization of OR4C16 expression in heterogeneous cell populations

• CRISPR gene editing: Enabling precise manipulation of OR4C16 and interacting genes

• Structural biology approaches: Cryo-EM and computational modeling to understand OR4C16 structure-function relationships

• Organoid systems: Development of olfactory organoids for more physiologically relevant models

Through continued investigation using these advanced approaches, our understanding of OR4C16 and its role in olfactory signaling will continue to expand, potentially revealing new therapeutic targets or diagnostic applications.