2dvz
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(New page: 200px<br /><applet load="2dvz" size="350" color="white" frame="true" align="right" spinBox="true" caption="2dvz, resolution 2.30Å" /> '''Structure of a perip...)
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Revision as of 17:13, 29 January 2008
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Structure of a periplasmic transporter
Overview
The Bug proteins form a large family of periplasmic solute-binding, receptors present in a number of bacterial species. Here, the crystal, structure of Bordetella pertussis BugE, a member of the Bug family coded, by the gene BP0250, is reported. It adopts the Venus flytrap architecture, of periplasmic binding proteins, with two domains separated by a deep, cleft. BugE has a bound ligand, identified as a glutamate. The structure, of B. pertussis BugD, which is an aspartic acid transporter, has recently, been reported. These structures reveal high conservation of the Bug, architecture, despite limited sequence identity. They share a common, carboxylate-binding motif defined by two strand-beta-turn-alpha-helix, motifs, also involving two water molecules to bridge the carboxylate O, atoms to the protein. The two water molecules are hydrogen bonded to a, common main-chain carbonyl group. Although the features of the, carboxylate-binding motif are totally conserved, the ligand in BugE is, bound by its side-chain carboxylate group rather than by its, alpha-carboxylate as in BugD. This specific ligand-binding motif is highly, conserved in Bug proteins and the BugE structure suggests that the cavity, of the Bug proteins might also accommodate carboxylated solutes other than, amino acids. The vast expansion of the Bug family in several bacterial, genera is likely to be explained by the possible diversity of ligands. No, charged residues are involved in glutamate binding by BugE, unlike what, has been described for all glutamate receptors reported so far.
About this Structure
2DVZ is a Single protein structure of sequence from Bordetella pertussis with and as ligands. Full crystallographic information is available from OCA.
Reference
Structural analysis of Bordetella pertussis BugE solute receptor in a bound conformation., Huvent I, Belrhali H, Antoine R, Bompard C, Locht C, Jacob-Dubuisson F, Villeret V, Acta Crystallogr D Biol Crystallogr. 2006 Nov;62(Pt 11):1375-81. Epub 2006, Oct 18. PMID:17057341
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