The BIP-300 plasmid construct consists of a modified β-galactosidase gene (8 amino acids are deleted from its N-terminal end) cloned into the pAN5 AviTag? fusion vector. The resulting AviTag?-β-gal fusion gene is under the tight control of the Trc promoter system and expressed upon IPTG induction. When transformed into the same E. coli host strain as your own AviTag? fusion plasmid construct, and induced in parallel, the BIP-300 will provide a positive control by which to compare your AviTag? construct's induction and in vivo biotinylation efficiency. The plasmid is maintained with ampicillin. Quantity: 2μg at 1mg/mL.