Recombinant Human BBS10 Protein: Handling & Usage Protocol

Recombinant Human BBS10 Protein is a key research tool for investigating the molecular mechanisms of Bardet-Biedl syndrome and BBSome complex assembly, ciliary trafficking, and related ciliopathy pathways.

Product Name

Recombinant Human BBS10 Protein

SKU

rp374776

Gene / Protein Target

BBS10 (Bardet-Biedl Syndrome 10 Protein)

Species

Human (Homo sapiens)

Protein Class

Chaperonin-like BBSome assembly factor; involved in ciliary trafficking

Recommended Storage

Avoid repeated freeze-thaw cycles; store at -80°C for long-term; -20°C for short-term use (refer to CoA for exact conditions)

Application Areas

Protein interaction studies, BBSome complex reconstitution, functional assays, Western blot validation

Background: BBS10 and the BBSome Complex

Bardet-Biedl Syndrome (BBS) is a rare autosomal recessive ciliopathy characterized by rod-cone dystrophy, obesity, polydactyly, renal anomalies, and cognitive impairment. It is caused by mutations in over 20 identified BBS genes. BBS10 encodes a vertebrate-specific chaperonin-like protein that does not form part of the core BBSome octameric complex but instead acts as a critical assembly chaperone required for the formation of functional BBSome complexes.

The BBSome is an evolutionarily conserved coat-like protein complex that mediates the trafficking of signaling receptors to and within primary cilia. BBS10, together with BBS6 and BBS12, forms a transient chaperonin-like complex that facilitates the assembly of the BBSome by interacting with BBS7 and other core subunits. Loss-of-function mutations in BBS10 are among the most common causes of BBS in human populations, highlighting the clinical and biological importance of this protein.

Recombinant Human BBS10 Protein (rp374776) enables researchers to perform in vitro studies of BBSome assembly, protein–protein interactions, and downstream ciliary signaling pathways without the technical limitations associated with endogenous protein isolation.

Reconstitution and Storage Protocol

Materials required: Sterile distilled water or an appropriate reconstitution buffer (e.g., PBS pH 7.4 or the buffer specified on the Certificate of Analysis), low-protein-binding microcentrifuge tubes, ice.

Step 1 – Equilibration: Allow the lyophilized protein vial to equilibrate to room temperature (approximately 15–25°C) for 10–15 minutes before opening to minimize condensation and moisture uptake.

Step 2 – Reconstitution: Briefly centrifuge the sealed vial (1,000 × g, 30 seconds) to consolidate the lyophilized cake at the bottom. Add the recommended volume of sterile reconstitution buffer slowly along the side of the vial. Do not add the buffer directly onto the lyophilized cake, as this may cause foaming and protein denaturation. Gently swirl or pipette to mix; do not vortex.

Step 3 – Incubation: Allow the reconstituted solution to stand for 5–10 minutes at room temperature to ensure complete dissolution.

Step 4 – Aliquoting: To avoid repeated freeze-thaw cycles that degrade protein activity and structural integrity, prepare single-use aliquots immediately after reconstitution. Transfer aliquots into pre-chilled, low-protein-binding tubes on ice.

Step 5 – Storage: Store aliquots at -80°C for long-term preservation. For short-term use (within 1–2 weeks), aliquots may be stored at -20°C. Always refer to the lot-specific Certificate of Analysis (CoA) for confirmed storage conditions, carrier protein requirements, and recommended reconstitution volume.

Note: Addition of a carrier protein such as 0.1% BSA may improve stability for certain applications. Verify compatibility with your downstream assay before use.

Experimental Applications and Usage Guidelines

Recombinant Human BBS10 Protein is suitable for a range of in vitro research applications. Researchers should optimize conditions for each specific assay. Common applications include:

• Protein–Protein Interaction Studies: BBS10 is well-characterized as an interaction partner of BBS6, BBS7, and BBS12. Pull-down assays, co-immunoprecipitation (co-IP) experiments, or surface plasmon resonance (SPR) studies can be used to map interaction interfaces and assess binding affinities.
• BBSome Assembly Reconstitution: BBS10 is a required chaperone for in vitro reconstitution of the BBSome complex. Combine with other recombinant BBS subunits under defined buffer conditions to study assembly dynamics.
• Functional/Biochemical Assays: Investigate the chaperonin-like ATPase activity, if applicable, or use BBS10 to complement cell-free systems studying ciliogenesis or ciliary cargo sorting.
• Western Blot Positive Control: Use as a positive control or molecular weight reference for anti-BBS10 antibody validation in Western blot experiments.
• Structural Studies: Suitable as starting material for structural characterization methods such as cryo-electron microscopy (cryo-EM) or native mass spectrometry when combined with appropriate quality controls.

Always determine the optimal working concentration empirically for your specific experimental system. Start with the concentration range suggested on the CoA and titrate as needed.

Quality Control and Troubleshooting

Quality Control: Recombinant Human BBS10 Protein (rp374776) is manufactured and tested in accordance with quality standards appropriate for research-grade reagents. Typical QC testing may include SDS-PAGE analysis for purity assessment, endotoxin testing (LAL method), and functional activity assays where applicable. Refer to the lot-specific CoA for confirmed purity, molecular weight, and activity data.

Common Issues and Troubleshooting:

• Protein precipitation upon reconstitution: Ensure the buffer is at the correct pH and ionic strength. Warm the buffer slightly (to room temperature) before addition. If precipitation persists, try a buffer with a mild detergent (e.g., 0.01% Tween-20) or a stabilizing agent.
• Low activity or loss of binding: Most frequently caused by freeze-thaw degradation or protein denaturation during handling. Always work on ice, use pre-chilled tubes, and minimize the time the protein spends at room temperature.
• Unexpected molecular weight on SDS-PAGE: BBS10 may exhibit anomalous migration under denaturing conditions. Confirm expected apparent molecular weight from the CoA and compare with non-reducing conditions if needed.
• High background in binding assays: Include appropriate blocking agents (e.g., BSA or casein) and negative controls lacking BBS10 to distinguish specific from non-specific interactions.

Frequently asked questions

What is the biological function of BBS10 protein?

BBS10 is a vertebrate-specific chaperonin-like protein that acts as an assembly factor for the BBSome complex, a multiprotein complex required for ciliary trafficking of signaling receptors. Together with BBS6 and BBS12, BBS10 forms a transient chaperonin-like module that facilitates the incorporation of BBS7 and other subunits into the BBSome. Loss-of-function mutations in BBS10 are among the most prevalent causes of Bardet-Biedl Syndrome.

How should I reconstitute and store Recombinant Human BBS10 Protein (rp374776)?

Allow the vial to reach room temperature before opening, then briefly centrifuge to consolidate the lyophilized material. Reconstitute by gently adding the recommended volume of sterile buffer (e.g., PBS pH 7.4 or as specified on the CoA) along the vial wall without vortexing. Immediately aliquot into single-use volumes and store at -80°C for long-term use or -20°C for short-term use. Avoid repeated freeze-thaw cycles to preserve activity.

What experimental applications is Recombinant Human BBS10 Protein suitable for?

Recombinant Human BBS10 Protein is suitable for protein–protein interaction studies (pull-down, co-IP, SPR), in vitro BBSome complex reconstitution experiments, Western blot positive control applications, and structural biology studies such as cryo-EM. Researchers should empirically optimize working concentrations and buffer conditions for each specific assay.

How can I verify the quality and purity of the received BBS10 protein?

Check the lot-specific Certificate of Analysis (CoA) included with the shipment for SDS-PAGE purity data, endotoxin levels, and any functional activity results. You may also run your own SDS-PAGE gel to confirm the expected apparent molecular weight and assess purity. If you have concerns about activity, perform a protein-protein interaction assay with a known BBS10 binding partner such as BBS6 or BBS7.

References

1. Stoetzel C, et al. BBS10 encodes a vertebrate-specific chaperonin-like protein and is a major BBS locus. Nature Genetics. 2006;38(5):521–524. doi:10.1038/ng1771
2. Loktev AV, et al. A BBSome subunit links ciliogenesis, microtubule stability, and acetylation. Developmental Cell. 2008;15(6):854–865. doi:10.1016/j.devcel.2008.11.001
3. Nachury MV, et al. A core complex of BBS proteins cooperates with the GTPase Rab8 to promote ciliary membrane biogenesis. Cell. 2007;129(6):1201–1213. doi:10.1016/j.cell.2007.03.053

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