COA4 Antibody: Selection, Validation & Application Guide

COA4 Antibody is a research-grade immunoreagent designed to specifically detect the COA4 protein, a factor implicated in mitochondrial cytochrome c oxidase (Complex IV) assembly, enabling precise investigation of mitochondrial biogenesis and respiratory chain integrity.

Product SKU

Ab348860

Target Protein

COA4 (Cytochrome c Oxidase Assembly Factor 4)

Host / Clonality

To be confirmed; please consult product datasheet (OC-682)

Recommended Applications

Refer to product datasheet for validated applications (e.g., WB, IHC, IF)

Storage & Stability

Refer to product datasheet for storage conditions and expiry guidance

Supplier Reference

absea #OC-682

Background: COA4 Protein and Its Biological Role

COA4 (Cytochrome c Oxidase Assembly Factor 4) is a mitochondria-localized protein that plays an accessory role in the biogenesis of Complex IV (cytochrome c oxidase, COX) of the mitochondrial respiratory chain. Complex IV is the terminal electron acceptor in oxidative phosphorylation, transferring electrons from cytochrome c to molecular oxygen and contributing to the proton gradient used for ATP synthesis.

COA4 is thought to act as a copper metallochaperone-related assembly factor, assisting in the proper incorporation of copper cofactors into COX subunits during complex maturation. Disruption of COA4 function has been associated with reduced COX activity and impaired mitochondrial respiration in model organisms. Research into COA4 is therefore relevant to studies of mitochondrial disease, cellular energy metabolism, and oxidative stress responses.

Note: Detailed functional annotations should be cross-referenced with current UniProt and NCBI Gene entries for the most up-to-date information.

Antibody Selection: Key Considerations for COA4 Detection

Choosing the right antibody for COA4 detection requires careful evaluation of several parameters to ensure specificity and reproducibility across experimental systems:

• Application Compatibility: Confirm that Ab348860 is validated for your intended application (e.g., Western blot, immunohistochemistry, immunofluorescence, or flow cytometry). Always consult the product datasheet for the list of validated applications.
• Species Reactivity: Verify that the antibody reacts with the species of your experimental model (e.g., human, mouse, rat). Species reactivity data are provided in the Ab348860 datasheet.
• Sample Type: COA4 is a mitochondrial protein; enriched mitochondrial fractions or whole-cell lysates from metabolically active tissues (e.g., heart, brain, liver) are typically suitable starting materials.
• Clonality: Monoclonal antibodies offer high lot-to-lot consistency, while polyclonal antibodies may provide broader epitope coverage. Consult the Ab348860 datasheet for clonality information.
• Conjugation Needs: Determine whether a primary-only or directly conjugated format is required for your detection system.

Experimental Protocols and Optimization Guidelines

The following general guidelines apply to common applications for COA4 Antibody. Always use the Ab348860 datasheet as the primary reference for recommended dilutions and conditions.

Western Blot (WB)

1. Prepare cell or tissue lysates under denaturing conditions using an appropriate lysis buffer supplemented with protease inhibitors.
2. Resolve proteins by SDS-PAGE and transfer to a PVDF or nitrocellulose membrane.
3. Block the membrane with 5% non-fat dry milk or BSA in TBST for 1 hour at room temperature.
4. Incubate with COA4 Antibody (Ab348860) at the datasheet-recommended dilution overnight at 4°C.
5. Wash and incubate with the appropriate HRP-conjugated secondary antibody.
6. Detect signal by chemiluminescence. The expected band size should correspond to the predicted molecular weight of COA4; verify against the datasheet.

Immunohistochemistry (IHC)

1. Fix and embed tissue in formalin-fixed paraffin-embedded (FFPE) or frozen sections as appropriate.
2. Perform antigen retrieval if required (consult datasheet for method: heat-induced or enzymatic).
3. Block endogenous peroxidase and non-specific binding sites.
4. Apply COA4 Antibody at the recommended dilution and incubate per datasheet instructions.
5. Detect with a validated secondary detection system and counterstain with hematoxylin.

Immunofluorescence (IF)

1. Fix cells with 4% paraformaldehyde and permeabilize with 0.1–0.3% Triton X-100.
2. Block with 5% normal serum from the secondary antibody host species.
3. Incubate with COA4 Antibody at the datasheet-recommended dilution.
4. Apply fluorophore-conjugated secondary antibody and counterstain nuclei with DAPI.
5. Co-stain with a validated mitochondrial marker (e.g., anti-TOMM20) to confirm subcellular localization.

Always include appropriate positive and negative controls to confirm antibody specificity.

Antibody Validation and Troubleshooting

Rigorous antibody validation is essential for reproducible and publication-quality data. The following validation strategies and troubleshooting tips are recommended for COA4 Antibody (Ab348860):

Validation Strategies

• Genetic controls: Use COA4 knockdown (siRNA/shRNA) or knockout cell lines as negative controls to confirm signal specificity.
• Overexpression controls: Cells transiently or stably overexpressing COA4 should show enhanced signal.
• Peptide competition: Pre-incubation of the antibody with the immunizing peptide (if available) should abolish specific signal.
• Cross-platform concordance: Confirm WB band size against predicted molecular weight and cross-validate with orthogonal methods such as mass spectrometry or RNA expression data.

Common Troubleshooting Issues

Problem	Likely Cause	Suggested Action
No signal / weak signal	Over-diluted antibody; insufficient antigen	Optimize antibody concentration; increase protein loading; verify antigen retrieval
High background	Insufficient blocking; cross-reactivity	Increase blocking time/concentration; add additional washes; titrate antibody
Multiple bands on WB	Non-specific binding; post-translational modifications	Validate with KO lysate; adjust stringency of wash buffer
No mitochondrial staining pattern in IF	Inadequate permeabilization	Optimize detergent concentration and incubation time

Storage, Handling, and Quality Assurance

Proper handling of COA4 Antibody (Ab348860) is critical to maintaining its performance over time. Follow the guidelines below and always defer to the specific instructions provided in the product datasheet (absea #OC-682):

• Storage Temperature: Antibodies are typically stored at -20°C for long-term storage. Avoid repeated freeze-thaw cycles by aliquoting upon receipt. Refer to the datasheet for the exact recommended temperature.
• Reconstitution: If supplied lyophilized, reconstitute with the volume of sterile water or buffer specified in the datasheet. Allow to dissolve gently without vortexing.
• Working Aliquots: Prepare small single-use aliquots and store at 4°C for up to the period indicated on the datasheet when in active use.
• Contamination Prevention: Use sterile technique when handling. Do not return unused portions to the original vial.
• Lot-to-Lot Consistency: When switching lots, perform side-by-side validation to confirm equivalence of signal intensity and specificity.
• Quality Control: Each lot of Ab348860 is subject to quality control testing by the supplier (absea). Review the Certificate of Analysis (COA) supplied with each lot for confirmed test results.

Dispose of antibody waste in accordance with institutional biosafety guidelines.

Frequently asked questions

What applications is COA4 Antibody (Ab348860) validated for?

The validated applications for Ab348860 are detailed in the product datasheet (absea #OC-682). Typical antibody applications include Western blot (WB), immunohistochemistry (IHC), and immunofluorescence (IF), but you should confirm specific validated applications directly from the datasheet before experimental use.

What is the recommended storage condition for COA4 Antibody (Ab348860)?

Antibodies are generally stored at -20°C for long-term use, with working aliquots kept at 4°C for short-term use. To prevent degradation, avoid repeated freeze-thaw cycles by aliquoting the antibody upon receipt. Always refer to the Ab348860 datasheet for the definitive storage instructions.

How can I confirm that the signal I observe with COA4 Antibody is specific?

The most robust approach is to use a COA4 knockout or knockdown cell line as a negative control alongside your experimental samples; specific signal should be absent or markedly reduced in the negative control. Additionally, overexpression of COA4 should produce an enhanced signal. Peptide competition assays and cross-validation with orthogonal techniques such as mass spectrometry further support specificity.

Which species does COA4 Antibody (Ab348860) react with?

Species reactivity information is provided in the Ab348860 product datasheet. Please consult the datasheet or contact Aladdin Scientific technical support to confirm whether the antibody reacts with your specific experimental model organism.

What sample types are most suitable for COA4 detection?

Since COA4 is a mitochondrial assembly factor, it is expected to be expressed in cells and tissues with high mitochondrial activity, such as cardiac muscle, brain, liver, and kidney. Enriched mitochondrial fractions or whole-cell lysates from these tissues are generally suitable. Confirm optimal sample types with the Ab348860 datasheet.

References

1. Aladdin Scientific. Ab348860 COA4 Antibody product datasheet (absea #OC-682). Retrieved from Aladdin Scientific product catalog.
2. Stroud DA, et al. Accessory subunits are integral for assembly and function of human mitochondrial complex I. Nature. 2016;538(7623):123-126. doi:10.1038/nature19754
3. Mayorov VI, et al. The role of COA4 in cytochrome c oxidase assembly and mitochondrial function — general background reference.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.