1g97

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spinqualitylabelsall models 1g97, resolution 1.96Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

S.PNEUMONIAE GLMU COMPLEXED WITH UDP-N-ACETYLGLUCOSAMINE AND MG2+

Overview

N-Acetylglucosamine-1-phosphate uridyltransferase (GlmU) is an essential, bacterial enzyme with both an acetyltransferase and a uridyltransferase, activity which have been mapped to the C-terminal and N-terminal domains, respectively. GlmU performs the last two steps in the synthesis of, UDP-N-acetylglucosamine (UDP-GlcNAc), which is an essential precursor in, both the peptidoglycan and the lipopolysaccharide metabolic pathways. GlmU, is therefore an attractive target for potential antibiotics. Knowledge of, its three-dimensional structure would provide a basis for rational drug, design. We have determined the crystal structures of Streptococcus, pneumoniae GlmU (SpGlmU) in apo form at 2.33 A resolution, and in complex, with UDP-N-acetyl glucosamine and the essential co-factor Mg(2+) at 1.96 A, resolution. The protein structure consists of an N-terminal domain with an, alpha/beta-fold, containing the uridyltransferase active site, and a, C-terminal domain with a long left-handed beta-sheet helix (LbetaH), domain. An insertion loop containing the highly conserved sequence motif, Asn-Tyr-Asp-Gly protrudes from the left-handed beta-sheet helix domain. In, the crystal, S. pneumoniae GlmU forms exact trimers, mainly through, contacts between left-handed beta-sheet helix domains., UDP-N-acetylglucosamine and Mg(2+) are bound at the uridyltransferase, active site, which is in a closed form. We propose a uridyltransferase, mechanism in which the activation energy of the double negatively charged, phosphorane transition state is lowered by charge compensation of Mg(2+), and the side-chain of Lys22.

About this Structure

1G97 is a Single protein structure of sequence from Streptococcus pneumoniae with MG, NA and UD1 as ligands. Active as UDP-N-acetylglucosamine diphosphorylase, with EC number 2.7.7.23 Full crystallographic information is available from OCA.

Reference

Crystal structures of Streptococcus pneumoniae N-acetylglucosamine-1-phosphate uridyltransferase, GlmU, in apo form at 2.33 A resolution and in complex with UDP-N-acetylglucosamine and Mg(2+) at 1.96 A resolution., Kostrewa D, D'Arcy A, Takacs B, Kamber M, J Mol Biol. 2001 Jan 12;305(2):279-89. PMID:11124906

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