1kqb

Structure of Nitroreductase from E. cloacae complex with inhibitor benzoate

spinqualitylabelsall models 1kqb, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1kqb is a 4 chain structure with sequence from "aerobacter_cloacae"_(jordan_1890)_bergey_et_al._1923 "aerobacter cloacae" (jordan 1890) bergey et al. 1923. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BEZ, FMN Related: 1kqc, 1kqd Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [NFNB_ENTCL] Reduction of a variety of nitroaromatic compounds using NADH (and to lesser extent NADPH) as source of reducing equivalents; two electrons are transferred. 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 The crystal structure of the nitroreductase enzyme from Enterobacter cloacae has been determined for the oxidized form in separate complexes with benzoate and acetate inhibitors and for the two-electron reduced form. Nitroreductase is a member of a group of enzymes that reduce a broad range of nitroaromatic compounds and has potential uses in chemotherapy and bioremediation. The monomers of the nitroreductase dimer adopt an alpha+beta fold and together bind two flavin mononucleotide prosthetic groups at the dimer interface. In the oxidized enzyme, the flavin ring system adopts a strongly bent (16 degrees ) conformation, and the bend increases (25 degrees ) in the reduced form of the enzyme, roughly the conformation predicted for reduced flavin free in solution. Because free oxidized flavin is planar, the induced bend in the oxidized enzyme may favor reduction, and it may also account for the characteristic inability of the enzyme to stabilize the one electron-reduced semiquinone flavin, which is also planar. Both inhibitors bind over the pyrimidine and central rings of the flavin in partially overlapping sites. Comparison of the two inhibitor complexes shows that a portion of helix H6 can flex to accommodate the differently sized inhibitors suggesting a mechanism for accommodating varied substrates. Structures of nitroreductase in three states: effects of inhibitor binding and reduction.,Haynes CA, Koder RL, Miller AF, Rodgers DW J Biol Chem. 2002 Mar 29;277(13):11513-20. Epub 2002 Jan 22. PMID:11805110 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Nitroreductase

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