BirA biotin protein ligase is supplied in a 100 ug format. Applications include In vitro biotinylation of AviTag or biotin acceptor peptide tagged proteins, preparation of biotinylated proteins for streptavidin-based assays, ELISA, SPR, BLI, pull-down, AlphaScreen. The enzyme catalyzes site-specific covalent biotin attachment to AviTag-bearing proteins using biotin, ATP, and magnesium-containing reaction conditions. Technical specifications are included below.- Quantity - 100 ug- Source / Expression: Expressed in E. coli cell expression system (amino acids 3–321)- Molecular Weight - 36.2 kDa- Purification Tag - Features an N-terminal His-tag, allowing for easy removal post-reaction using a Ni-NTA column (if the substrate lacks a His-tag)- Purity - Greater than 90%- High Activity - 5,000 Units/µg. 1 Unit biotinylates 1 pmol of AviTag peptide substrate in 30 minutes at 30 C.- Storage - -20 CThis product is for research use only.