2d1u

Solution strcuture of the periplasmic signaling domain of FecA from Escherichia coli

spinqualitylabelsall models 2d1u, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2d1u is a 1 chain structure with sequence from Escherichia coli. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: fecA (Escherichia coli) Resources: FirstGlance, OCA, RCSB, PDBsum Function [FECA_ECOLI] FecA is the outer membrane receptor protein in the Fe(3+) dicitrate transport system. 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 Gram-negative bacteria possess outer membrane receptors that utilize energy provided by the TonB system to take up iron. Several of these receptors participate in extracytoplasmic factor (ECF) signalling through an N-terminal signalling domain that interacts with a periplasmic transmembrane anti-sigma factor protein and a cytoplasmic sigma factor protein. The structures of the intact TonB-dependent outer membrane receptor FecA from Escherichia coli and FpvA from Pseudomonas aeruginosa have recently been solved by protein crystallography; however, no electron density was detected for their periplasmic signalling domains, suggesting that it was either unfolded or flexible with respect to the remainder of the protein. Here we describe the well-defined solution structure of this domain solved by multidimensional nuclear magnetic resonance (NMR) spectroscopy. The monomeric protein construct contains the 79-residue N-terminal domain as well as the next 17 residues that are part of the receptor's plug domain. These form two clearly distinct regions: a highly structured domain at the N-terminal end followed by an extended flexible tail at the C-terminal end, which includes the 'TonB-box' region, and connects it to the plug domain of the receptor. The structured region consists of two alpha-helices that are positioned side by side and are sandwiched in between two small beta-sheets. This is a novel protein fold which appears to be preserved in all the periplasmic signalling domains of bacterial TonB-dependent outer membrane receptors that are involved in ECF signalling, because the hydrophobic residues that make up the core of the protein domain are highly conserved. Nuclear magnetic resonance solution structure of the periplasmic signalling domain of the TonB-dependent outer membrane transporter FecA from Escherichia coli.,Garcia-Herrero A, Vogel HJ Mol Microbiol. 2005 Dec;58(5):1226-37. PMID:16313612 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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