4r36
From Proteopedia
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== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/Q5LH16_BACFN Q5LH16_BACFN]] Involved in the biosynthesis of lipid A, a phosphorylated glycolipid that anchors the lipopolysaccharide to the outer membrane of the cell.[SAAS:SAAS00064151] | [[http://www.uniprot.org/uniprot/Q5LH16_BACFN Q5LH16_BACFN]] Involved in the biosynthesis of lipid A, a phosphorylated glycolipid that anchors the lipopolysaccharide to the outer membrane of the cell.[SAAS:SAAS00064151] | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Uridine 5'-diphosphate-N-acetylglucosamine (UDP-GlcNAc) acyltransferase (LpxA) catalyzes a reversible reaction for adding an O-acyl group to the GlcNAc in UDP-GlcNAc in the first step of lipid A biosynthesis. Lipid A constitutes a major component of lipopolysaccharides, also referred to as endotoxins, which form the outer monolayer of the outer membrane of Gram-negative bacteria. Ligand-free and UDP-GlcNAc-bound crystal structures of LpxA from Bacteroides fragilis NCTC 9343, the most common pathogenic bacteria found in abdominal abscesses, have been determined and are presented here. The enzyme crystallizes in a cubic space group, with the crystallographic threefold axis generating the biological functional homotrimer and with each monomer forming a nine-rung left-handed beta-helical (LbetaH) fold in the N-terminus followed by an alpha-helical motif in the C-terminus. The structure is highly similar to LpxA from other organisms. Yet, despite sharing a similar LbetaH structure with LpxAs from Escherichia coli and others, previously unseen calcium ions are observed on the threefold axis in B. fragilis LpxA to help stabilize the trimeric assembly. | ||
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| + | Structures of Bacteroides fragilis uridine 5'-diphosphate-N-acetylglucosamine (UDP-GlcNAc) acyltransferase (BfLpxA).,Ngo A, Fong KT, Cox DL, Chen X, Fisher AJ Acta Crystallogr D Biol Crystallogr. 2015 May;71(Pt 5):1068-76. doi:, 10.1107/S1399004715003326. Epub 2015 Apr 24. PMID:25945572<ref>PMID:25945572</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
Revision as of 06:36, 20 May 2015
Crystal structure analysis of LpxA, a UDP-N-acetylglucosamine acyltransferase from Bacteroides fragilis 9343
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