4ey3

Crystal structure of solute binding protein of ABC transporter in complex with p-hydroxybenzoic acid

spinqualitylabelsall models 4ey3, resolution 2.22Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ey3 is a 1 chain structure with sequence from Rhodopseudomonas palustris BisB5. This structure supersedes the now removed PDB entry 3t0n. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MSE, PHB Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q13AR6_RHOPS Publication Abstract from PubMed In vitro growth experiments have demonstrated that aromatic compounds derived from lignin can be metabolized and represent a major carbon resource for many soil bacteria. However, the proteins that mediate the movement of these metabolites across the cell membrane have not been thoroughly characterized. To address this deficiency, we used a library representative of lignin degradation products and a thermal stability screen to determine ligand specificity for a set of solute-binding proteins (SBPs) from ATP-binding cassette (ABC) transporters. The ligand mapping process identified a set of proteins from Alphaproteobacteria that recognize various benzoate derivatives. Seven high-resolution crystal structures of these proteins in complex with four different aromatic compounds were obtained. The protein-ligand complexes provide details of molecular recognition that can be used to infer binding specificity. This structure-function characterization provides new insight for the biological roles of these ABC transporters and their SBPs, which had been annotated as branched-chain amino-acid-binding proteins. The knowledge derived from the crystal structures provides a foundation for development of sequence-based methods to predict the ligand specificity of other uncharacterized transporters. These results also demonstrate that Alphaproteobacteria possess a diverse set of transport capabilities for lignin-derived compounds. Characterization of this new class of transporters improves genomic annotation projects and provides insight into the metabolic potential of soil bacteria. Characterization of Transport Proteins for Aromatic Compounds Derived from Lignin: Benzoate Derivative Binding Proteins.,Michalska K, Chang C, Mack JC, Zerbs S, Joachimiak A, Collart FR J Mol Biol. 2012 Aug 25. PMID:22925578 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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