1nb9 | pdb_00001nb9

Crystal Structure of Riboflavin Kinase

spinqualitylabelsall models 1nb9, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1nb9 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP, MG, RBF Related: 1nb0, 1nbg Gene: FLJ11149 (Homo sapiens) Activity: Riboflavin kinase, with EC number 2.7.1.26 Resources: FirstGlance, OCA, RCSB, PDBsum 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 Riboflavin kinase (RFK) is an essential enzyme catalyzing the phosphorylation of riboflavin (vitamin B(2)) to form FMN, an obligatory step in vitamin B(2) utilization and flavin cofactor synthesis. The structure of human RFK revealed a six-stranded antiparallel beta barrel core structurally similar to the riboflavin synthase/ferredoxin reductase FAD binding domain fold. The binding site of an intrinsically bound MgADP defines a novel nucleotide binding motif that encompasses a loop, a 3(10) helix, and a reverse turn followed by a short beta strand. This active site loop forms an arch with ATP and riboflavin binding at the opposite side and the phosphoryl transfer appears to occur through the hole underneath the arch. The invariant residues Asn36 and Glu86 are implicated in the catalysis. Crystal structure of human riboflavin kinase reveals a beta barrel fold and a novel active site arch.,Karthikeyan S, Zhou Q, Mseeh F, Grishin NV, Osterman AL, Zhang H Structure. 2003 Mar;11(3):265-73. PMID:12623014 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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