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gamma-L-glutamyl-butirosin B gamma-glutamyl cyclotransferase (5-oxoproline producing)
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 alpha-amine of the terminal gamma-L-glutamate of the side chain, releasing it as the cyclic 5-oxoproline.