butirosin B [CPD:C17586];
5-oxo-L-proline [CPD:C01879]
Comment
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-oxo-L-proline.