2lx9 | pdb_00002lx9

Solution Structure of Escherichia coli Ferrous Iron transport protein A (FeoA)

spinqualitylabelsall models 2lx9, 30 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2lx9 is a 1 chain structure with sequence from Escherichia coli k-12. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: b3408, feoA, JW3371 (Escherichia coli K-12) Resources: FirstGlance, OCA, RCSB, PDBsum Function [FEOA_ECOLI] Not known. Involved in Fe(2+) ion uptake. Publication Abstract from PubMed Iron is an indispensible nutrient for most organisms. Ferric iron (Fe(3+)) predominates under aerobic conditions, while during oxygen limitation ferrous (Fe(2+)) iron is usually present. The Feo system is a bacterial ferrous iron transport system first discovered in Escherichia coli K12. It consists of three genes, feoA, feoB, and feoC (yhgG). FeoB is thought to be the main transmembrane transporter while FeoC is considered to be a transcriptional regulator. Using multidimensional Nuclear Magnetic Resonance (NMR) spectroscopy, we have determined the solution structure of E. coli FeoA. The structure of FeoA reveals a Src-Homology 3 (SH3)-like fold. The structure is composed of a beta-barrel with two alpha-helices where one helix is positioned over the barrel. In comparison to the standard eukaryotic SH3 fold, FeoA has two additional alpha-helices. FeoA was further characterized by heteronuclear NMR dynamics measurements, which suggests that it is a monomeric stable globular protein. Model free analysis of the NMR relaxation results indicates that a slow conformational dynamic process is occurring in beta-strand 4 that may be important for function. (31)P NMR based GTPase activity measurements with the N-terminal domain of FeoB (NFeoB) indicate a higher GTP hydrolysis rate in the presence of potassium versus sodium. Further enzymatic assays with NFeoB suggest that FeoA may not act as a GTPase Activating Protein as previously proposed. These findings together with bioinformatics and structural analyses suggest that FeoA may have a different role, possibly interacting with the cytoplasmic domain of the highly conserved core portion of the FeoB transmembrane region. Solution structure of Escherichia coli FeoA and its potential role in bacterial ferrous iron transport.,Lau CK, Ishida H, Liu Z, Vogel HJ J Bacteriol. 2012 Oct 26. PMID:23104801 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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