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UDP-3-O-[3-hydroxymyristoyl] glucosamine N-acyltransferase, LpxD UDP-3-O-[3-hydroxymyristoyl] glucosamine N-acyltransferase (EC 2.3.1.-) catalyzes an early step in lipid A biosynthesis: UDP-3-O-(3-hydroxytetradecanoyl)glucosamine + (R)-3-hydroxytetradecanoyl- [acyl carrier protein] -> UDP-2,3-bis(3-hydroxytetradecanoyl)glucosamine + [acyl carrier protein]. Members of this family also contain a hexapeptide repeat (pfam00132). This family constitutes the non-repeating region of LPXD proteins.
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