Mutant enzyme W27G Lumazine Synthase from S.pombe

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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The structural basis of riboflavin binding to Schizosaccharomyces pombe 6,7-dimethyl-8-ribityllumazine synthase.

Gerhardt, S.Haase, I.Steinbacher, S.Kaiser, J.T.Cushman, M.Bacher, A.Huber, R.Fischer, M.

(2002) J Mol Biol 318: 1317-1329

  • DOI: https://doi.org/10.1016/s0022-2836(02)00116-x
  • Primary Citation of Related Structures:  
    1KYV, 1KYX, 1KYY, 1KZ1, 1KZ4, 1KZ6, 1KZ9

  • PubMed Abstract: 

    Riboflavin is an essential cofactor in all organisms. Its direct biosynthetic precursor, 6,7-dimethyl-8-ribityllumazine, is synthesised by the enzyme 6,7-dimethyl-8-ribityllumazine synthase. Recently, we have found that the enzyme from Schizosaccharomyces pombe binds riboflavin, the final product of the pathway with a relatively high affinity with a KD of 1.2 microM. Here, we report on the crystal structure of lumazine synthase from S. pombe with bound riboflavin and compare the binding mode with those of the substrate analogue inhibitor 5-nitro-6-(D-ribitylamino)-2,4(1H,3H)-pyrimidinedione and of the product analogue 6-carboxyethyl-7-oxo-8-ribityllumazine. In all complexes the pyrimidinedione moieties of each respective ligand bind in a very similar orientation. Binding of riboflavin additionally involves a stacking interaction of the dimethylbenzene moiety with the side-chain of His94, a highly conserved residue in all lumazine synthases. The enzyme from Bacillus subtilis showed a KD of at least 1 mM whereas the very homologous enzyme from Saccharomyces cerevisiae had a comparable KD of 3.9 microM. Structural comparison of the S. cerevisiae, the S. pombe, and the mutant enzymes suggests that fine tuning of affinity is achieved by influencing this stacking interaction.

  • Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Martinsried, Germany. gerhardt@biochem.mpg.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
6,7-Dimethyl-8-ribityllumazine Synthase
A, B, C, D, E
159Schizosaccharomyces pombeMutation(s): 1 
Find proteins for Q9UUB1 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Explore Q9UUB1 
Go to UniProtKB:  Q9UUB1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UUB1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.568α = 90
b = 144.017β = 90
c = 126.355γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-07-24
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2013-01-23
    Changes: Structure summary
  • Version 1.4: 2021-11-10
    Changes: Database references
  • Version 1.5: 2024-05-29
    Changes: Data collection