1xoc

The structure of the oligopeptide-binding protein, AppA, from Bacillus subtilis in complex with a nonapeptide.

spinqualitylabelsall models 1xoc, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xoc is a 2 chain structure with sequence from Bacillus subtilis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.55Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function APPA_BACSU This protein is a component of an oligopeptide permease, a binding protein-dependent transport system. This APP system can completely substitute for the OPP system in both sporulation and genetic competence. AppA can bind and transport tetra- and pentapeptides but not tripeptides. 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 Besides their role as a source of amino acids for Bacillus subtilis, exogenous peptides play important roles in the signalling pathways leading to the development of competence and sporulation. B.subtilis has three peptide transport systems all belonging to the ATP-binding cassette family, a dipeptide permease (Dpp) and two oligopeptide permeases (Opp and App) with overlapping specificity. These comprise a membrane-spanning channel through which the peptide passes, a pair of ATPases which couple ATP hydrolysis to peptide translocation and a lipid-modified, membrane-anchored extracellular "binding-protein" that serves as the receptor for the system. Here, we present the crystal structure of a soluble form of the peptide-binding protein AppA, which has been solved to 1.6 A spacing by anomalous scattering and molecular replacement methods. The structure reveals a protein made of two distinct lobes with a topology similar to those of DppA from Escherichia coli and OppA from Salmonella typhimurium. Examination of the interlobe region reveals an enlarged pocket, containing electron density defining a nonapeptide ligand. The main-chain of the peptide is well defined and makes a series of polar contacts with the protein including salt-bridges at both its termini. The side-chain density is ambiguous in places, consistent with the interpretation that a population of peptides is bound, whose average electron density resembles the amino acid sequence N-VDSKNTSSW-C. The structure of the oligopeptide-binding protein, AppA, from Bacillus subtilis in complex with a nonapeptide.,Levdikov VM, Blagova EV, Brannigan JA, Wright L, Vagin AA, Wilkinson AJ J Mol Biol. 2005 Jan 28;345(4):879-92. PMID:15588833 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ABC transporter 3D structures AppA protein BLUF domain

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