2.3.1.47 metabolism the enzyme is essential for mycobacterial growth and plays a key role as the gatekeeper of the biotin biosynthesis pathway, catalyzing the first committed step, decarboxylative condensation of L-alanine with pimeloyl-CoA to form 7-oxo-8-aminopelargonic acid -, 735394, 736245 2.3.1.47 additional information the structure reveals an incomplete dimer, and the active site organization is similar to, but distinct from Escherichia coli 8-amino-7-oxononanoate synthase (EcAONS). Pyridoxal 5'-phosphate binding site residues His129, Lys235, and His200 are essential for MsBioF activity in vivo and residue Glu171 plays an important, but not essential role in MsBioF activity. The N-terminus (residues 1-37) is also essential for MsBioF activity in vivo, structure homology modeling and structure-function analysis of MsBioF, overview -, 736245