2iua | pdb_00002iua

C. TRACHOMATIS LPXD

spinqualitylabelsall models 2iua, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iua is a 3 chain structure with sequence from "chlamydozoon_trachomatis"_(busacca_1935)_moshkovski_1945 "chlamydozoon trachomatis" (busacca 1935) moshkovski 1945. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MES, PLM, SO4 Related: 2iu8, 2iu9 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The external layer of the Gram-negative bacterial outer membrane is primarily composed of a protective, selectively permeable LPS. The biosynthesis of LPS relies on UDP-3-O-acyl-glucosamine N-acyltransferase (LpxD), which transfers 3-hydroxy-arachidic acid from acyl carrier protein to the 2' amine of UDP-3-O-myristoyl glucosamine in Chlamydia trachomatis. Our crystallographic study reveals that LpxD is a homotrimer, each subunit of which is constructed from a novel combination of an N-terminal uridine-binding domain, a core lipid-binding domain, and a C-terminal helical extension. Highly conserved residues dominate nucleotide binding. Phe-43 and Tyr-49 form pi-stacking interactions with uracil, and Asn-46 and His-284 form hydrogen bonds with the phosphate groups. These interactions place the glucosamine moiety at the catalytic center formed by two adjacent subunits. Here His-247 and His-284 contribute to a mechanism involving nucleophilic attack by the amine of one substrate on the carbonyl carbon of an acyl carrier protein thioester conjugate. Serendipitously, our study reveals a fatty acid (FA) binding groove near the catalytic center. MS elucidated the presence of a FA mixture binding to LpxD, with palmitic acid the most prevalent. The placement of UDP-N-acetylglucosamine and the FA provides details of N-acyltransferase ligand interactions and allows for a description of structure and reactivity at an early stage of LPS assembly. Structure and reactivity of LpxD, the N-acyltransferase of lipid A biosynthesis.,Buetow L, Smith TK, Dawson A, Fyffe S, Hunter WN Proc Natl Acad Sci U S A. 2007 Mar 13;104(11):4321-6. Epub 2007 Mar 5. PMID:17360522 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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