Ribostamycin:4-(gamma-L-glutamylamino)-(S)-2-hydroxybutanoyl-(BtrI acyl-carrier protein) 4-(gamma-L-glutamylamino)-(S)-2-hydroxybutanoate transferase (EC2.3.2.19, btrH (gene)) is an enzyme with systematic nameribostamycin:4-(gamma-L-glutamylamino)-(S)-2-hydroxybutanoyl-(BtrI acyl-carrier protein) 4-(gamma-L-glutamylamino)-(S)-2-hydroxybutanoate transferase.[1] This enzyme catalyses the following chemical reaction
4-(gamma-L-glutamylamino)-(S)-2-hydroxybutanoyl-[BtrI acyl-carrier protein] + ribostamycin gamma-L-glutamyl-butirosin B + BtrI acyl-carrier protein
^Llewellyn NM, Li Y, Spencer JB (April 2007). "Biosynthesis of butirosin: transfer and deprotection of the unique amino acid side chain". Chemistry & Biology. 14 (4): 379–86. doi:10.1016/j.chembiol.2007.02.005. PMID17462573.