Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Crystal Structure of Human Riboflavin Kinase Reveals a Beta Barrel Fold and a Novel Active Site Arch

Karthikeyan, S.Zhou, Q.Mseeh, F.Grishin, N.V.Osterman, A.L.Zhang, H.

(2003) Structure 11: 265-273

  • DOI: https://doi.org/10.1016/s0969-2126(03)00024-8
  • Primary Citation of Related Structures:  
    1NB0, 1NB9, 1P4M

  • PubMed Abstract: 

    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.

  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RIBOFLAVIN KINASE147Homo sapiensMutation(s): 0 
Gene Names: FLJ11149
UniProt & NIH Common Fund Data Resources
Find proteins for Q969G6 (Homo sapiens)
Explore Q969G6 
Go to UniProtKB:  Q969G6
GTEx:  ENSG00000135002 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ969G6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.097α = 90
b = 57.097β = 90
c = 82.482γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-05-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description