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1nb0

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1nb0, resolution 1.70Å ()
Ligands: ,
Gene: FLJ11149 (Homo sapiens)
Activity: Riboflavin kinase, with EC number 2.7.1.26
Related: 1nb9, 1nbg
Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml



Crystal Structure of Human Riboflavin Kinase

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.

About this Structure

1nb0 is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

  • Karthikeyan S, Zhou Q, Mseeh F, Grishin NV, Osterman AL, Zhang H. Crystal structure of human riboflavin kinase reveals a beta barrel fold and a novel active site arch. Structure. 2003 Mar;11(3):265-73. PMID:12623014

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