1qfj

CRYSTAL STRUCTURE OF NAD(P)H:FLAVIN OXIDOREDUCTASE FROM ESCHERICHIA COLI

spinqualitylabelsall models 1qfj, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1qfj is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL Gene: FRE (Escherichia coli) Resources: FirstGlance, OCA, RCSB, PDBsum Function [FRE_ECOLI] Catalyzes the reduction of soluble flavins by reduced pyridine nucleotides. Seems to reduce the complexed Fe(3+) iron of siderophores to Fe(2+), thus releasing it from the chelator. 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 Flavin reductases use flavins as substrates and are distinct from flavoenzymes which have tightly bound flavins. The reduced flavin can serve to reduce ferric complexes and iron proteins. In Escherichia coli, reactivation of ribonucleotide reductase is achieved by reduced flavins produced by flavin reductase. The crystal structure of E. coli flavin reductase reveals that the enzyme structure is similar to the structures of the ferredoxin reductase family of flavoproteins despite very low sequence similarities. The main difference between flavin reductase and structurally related flavoproteins is that there is no binding site for the AMP moiety of FAD. The direction of the helix in the flavin binding domain, corresponding to the phosphate binding helix in the flavoproteins, is also slightly different and less suitable for phosphate binding. Interactions for flavin substrates are instead provided by a hydrophobic isoalloxazine binding site that also contains a serine and a threonine, which form hydrogen bonds to the isoalloxazine of bound riboflavin in a substrate complex. Crystal structure of NAD(P)H:flavin oxidoreductase from Escherichia coli.,Ingelman M, Ramaswamy S, Niviere V, Fontecave M, Eklund H Biochemistry. 1999 Jun 1;38(22):7040-9. PMID:10353815 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Flavin reductase

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