Reaction: γ-L-glutamyl-butirosin B = butirosin B + 5-oxo-L-proline
Glossary: γ-L-glutamyl-butirosin B = (1R,2R,3S,4R,6S)-6-amino-4-{[(2R)-4-(γ-L-glutamylamino)-2-hydroxybutanoyl]amino}-3-hydroxy-2-(α-D-ribofuranosyloxy)cyclohexyl; γ-L-glutamyl-butirosin B γ-glutamyl cyclotransferase (5-oxoproline producing)
Other name(s): btrG (gene name)
Systematic name: γ-L-glutamyl-butirosin B γ-glutamyl cyclotransferase (5-oxo-L-proline producing)
Comments: The enzyme catalyses the last step in the biosynthesis of the aminoglycoside antibiotic butirosin B. The enzyme acts as a cyclotransferase, cleaving the amide bond via transamidation using the α-amine of the terminal γ-L-glutamate of the side chain, releasing it as the cyclic 5-oxo-L-proline.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
References:
1. Llewellyn, N.M., Li, Y. and Spencer, J.B. Biosynthesis of butirosin: transfer and deprotection of the unique amino acid side chain. Chem. Biol. 14 (2007) 379-386. [PMID: 17462573]