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Scientific Background
Biotin-labeling is commonly used for non-radioactive labeling and purification of proteins and other target molecules. Biotin labeling takes advantage of the exceptionally strong interaction between biotin (vitamin H) and either avidin or streptavidin. The affinity of biotin to avidin or streptavidin is one of the strongest known non-covalent interactions of a protein and ligand, exhibiting a dissociation constant (Kd) around 10-15. BirA protein ligase covalently adds biotin to biotin-acceptor peptides containing an AviTag™ sequence in a highly efficient and specific ATP-dependent reaction.
Product Description
Molecular BiologyBirA-transformed Competent E. coli cells are supplied as 10 x 50 µl vials. Strain BL21, a chemically competent E. coli B strain, contains an IPTG-inducible BirA expression plasmid and constitutively-expressed streptomycin/spectinomycin resistance gene. These cells are compatible with most cloning vectors and are suitable for expression and biotinylation of recombinant proteins using AviTag™ technology.
Product Specifications
| Host Species | E. coli |
|---|---|
| Transfection Method | Heat Shock |
| Supplied As | 10 x 50 µl vials |
| Harmonized Tariff Code | 3002-5900 |
Usage Notes
For a detailed protocol, please see BPS Bioscience's E. coli in vivo Biotinylation Kit, Cat. #27461.
Safety & Handling
⚠ Avoid freeze/thaw cycles.
Regulatory Information
Related Products
Related Products: Cat. #70030, 20020, 70031, 70032, 27461, 78531
This product is classified as BSL-1. Standard microbiological practices (gloves, lab coat, eye protection) are sufficient. No specialized containment facility is required beyond a clean bench. Consult your institutional IBC for GMO registration requirements.
We recommend performing mycoplasma testing upon receipt and at regular intervals during culture, regardless of vendor QC status. Validated detection methods include PCR-based assays (e.g., Venor™GeM) and luminescence assays (e.g., MycoAlert™). Contamination can be introduced during routine handling.
Store this product at Liquid Nitrogen. Specifically: Immediately upon receipt, store vials in liquid nitrogen. Transfer cells from dry-ice shipping to the recommended storage immediately upon receipt. Avoid repeated freeze-thaw cycles, which reduce viability and may alter expression characteristics.
A standard research-use license applies (No (unless commercial)). Commercial applications or transfer to other facilities may require a separate license. Contact BPS Bioscience for details.
This stable cell line was generated using Heat Shock for transgene delivery into the parental host. The stably integrated cells were selected using the appropriate resistance marker and verified for expression prior to cryopreservation.
Can't find the cell line you need—or require a custom engineered model for your study? We offer end-to-end support for diverse research needs, including:
- Cell line sourcing and selection (species, tissue, and disease model matching)
- Stable cell line engineering (overexpression, knockdown, knockout via CRISPR/Cas9, shRNA, sgRNA)
- Reporter gene integration (GFP, RFP, luciferase, fluorescent/bioluminescent constructs)
- Genome editing and knockin (point mutations, tagged endogenous proteins, conditional alleles)
- Inducible expression systems (Tet-On/Off and regulatable constructs)
- Drug resistance marker selection (puromycin, G418, hygromycin, and others)
- Custom growth and media optimisation for specific assay requirements
- Scale-up production for high-throughput screening campaigns
- Authentication and QC services (STR profiling, mycoplasma testing, viability assessment)
Click Talk to a Scientist to submit a request form, email us at support@biohippo.com, or explore our Research Services for additional support. Our team will be in contact with you shortly.
