Bifunctional protein GlmU (GlmU)

Bifunctional protein GlmU is an essential bacterial enzyme with two catalytic activities: it functions as a N-acetyltransferase and a uridyltransferase. GlmU catalyzes the last two steps in the de novo biosynthesis of UDP-N-acetylglucosamine (UDP-GlcNAc). The C-terminal domain conducts acetylation of glucosamine-1-phosphate (GlcN-1-P) forming N-acetylglucosamine-1-phosphate, and the N-terminal domain attaches UTP to form UDP-GlcNAc[8][4][2]. UDP-GlcNAc is an essential precursor for bacterial cell wall (peptidoglycan) and lipopolysaccharide biosynthesis. GlmU is structurally characterized by two domains: a left-handed beta-helix (LbetaH, acetyltransferase domain) and a Rossmann fold (uridyltransferase domain). The enzyme forms a trimer, with the active sites at subunit interfaces[1][4]. GlmU is absent in humans and essential in bacteria such as Escherichia coli and Mycobacterium tuberculosis, making it a highly attractive target for novel antibiotic development[2][7][5]. Small-molecule inhibitors have been identified and structurally characterized, with efforts ongoing to optimize their specificity and efficacy[3][6]. GlmU is not currently associated with approved drugs or clinical biomarkers but is a key investigational target for anti-infective therapies. Caveats and limitations: - No approved drugs in clinical use currently target GlmU directly, though numerous inhibitors exist in preclinical research[3][6]. - While GlmU is a validated antibacterial target, no clinical biomarker applications have been established to date. - Off-target toxicology and bacterial resistance are important considerations for GlmU inhibitor development.

Other names

UDP-N-acetylglucosamine pyrophosphorylaseGlucosamine-1-phosphate N-acetyltransferase/uridyltransferaseN-acetylglucosamine-1-phosphate uridyltransferaseUDP-GlcNAc pyrophosphorylase

Competitive or allosteric inhibition of uridyltransferase activity. Inhibition of acetyltransferase activity, disrupting UDP-GlcNAc synthesis, which impairs formation of bacterial cell wall precursors[3][6]