AVB101 is an E. coli B strain that will co-express biotin ligase and your gene of interest.

Strain AVB101, an E. coli B strain (hsdR, lon11, sulA1), contains pBirAcm , an IPTG inducible plasmid containing the BirA gene engineered into pACYC184. It is compatible with most cloning vectors and is maintained with chloramphenicol (10 µg/ml). This strain is recommended for protein expression because of its robust growth and the absence of the OmpT and Lon proteases. Avidity, LLC provides the strain in  three forms- glycerol stock (AVB101), chemically competent cells (CVB101), and electrocompetent cells (EVB101). Learn more about this product.