The enzyme from several bacteria (e.g., Escherichia coli, Bacillus subtilis and Haemophilus influenzae) has been shown to be bifunctional and also to possess the activity of EC 184.108.40.206, UDP-N-acetylglucosamine diphosphorylase.
Mengin-Lecreulx, D. and van Heijenoort, J. Copurification of glucosamine-1-phosphate acetyltransferase and N-acetylglucosamine-1-phosphate uridyltransferase activities of Escherichia coli: characterization of the glmU gene product as a bifunctional enzyme catalyzing two subsequent steps in the pathway for UDP-N-acetylglucosamine synthesis. J. Bacteriol.176 (1994) 5788–5795. [PMID: 8083170]
Gehring, A.M., Lees, W.J., Mindiola, D.J., Walsh, C.T. and Brown, E.D. Acetyltransfer precedes uridylyltransfer in the formation of UDP-N-acetylglucosamine in separable active sites of the bifunctional GlmU protein of Escherichia coli. Biochemistry35 (1996) 579–585. [PMID: 8555230]
Olsen, L.R. and Roderick, S.L. Structure of the Escherichia coli GlmU pyrophosphorylase and acetyltransferase active sites. Biochemistry40 (2001) 1913–1921. [PMID: 11329257]