X-ray structure of E.coli Wrba in complex with FMN at 1.2 A resolution

Experimental Data Snapshot

  • Resolution: 1.20 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 

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1.2 A Resolution Crystal Structure of Escherichia Coli Wrba Holoprotein

Kishko, I.Carey, J.Reha, D.Brynda, J.Winkler, R.Harish, B.Guerra, R.Ettrichova, O.Kukacka, Z.Sheryemyetyeva, O.Novak, P.Kuty, M.Kuta Smatanova, I.Ettrich, R.Lapkouski, M.

(2013) Acta Crystallogr D Biol Crystallogr 69: 1757

  • DOI: https://doi.org/10.1107/S0907444913017162
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Escherichia coli protein WrbA, an FMN-dependent NAD(P)H:quinone oxidoreductase, was crystallized under new conditions in the presence of FAD or the native cofactor FMN. Slow-growing deep yellow crystals formed with FAD display the tetragonal bipyramidal shape typical for WrbA and diffract to 1.2 Å resolution, the highest yet reported. Faster-growing deep yellow crystals formed with FMN display an atypical shape, but diffract to only ∼1.6 Å resolution and are not analysed further here. The 1.2 Å resolution structure detailed here revealed only FMN in the active site and no electron density that can accommodate the missing parts of FAD. The very high resolution supports the modelling of the FMN isoalloxazine with a small but distinct propeller twist, apparently the first experimental observation of this predicted conformation, which appears to be enforced by the protein through a network of hydrogen bonds. Comparison of the electron density of the twisted isoalloxazine ring with the results of QM/MM simulations is compatible with the oxidized redox state. The very high resolution also supports the unique refinement of Met10 as the sulfoxide, confirmed by mass spectrometry. Bond lengths, intramolecular distances, and the pattern of hydrogen-bond donors and acceptors suggest the cofactor may interact with Met10. Slow incorporation of FMN, which is present as a trace contaminant in stocks of FAD, into growing crystals may be responsible for the near-atomic resolution, but a direct effect of the conformation of FMN and/or Met10 sulfoxide cannot be ruled out.

  • Organizational Affiliation

    Institute of Nanobiology and Structural Biology, Global Change Research Center, Academy of Sciences of the Czech Republic, Zamek 136, 37333 Nove Hrady, Czech Republic.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
197Escherichia coliMutation(s): 0 
Find proteins for P0A8G6 (Escherichia coli (strain K12))
Explore P0A8G6 
Go to UniProtKB:  P0A8G6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A8G6
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SME
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.20 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.15α = 90
b = 61.15β = 90
c = 169.59γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-28
    Type: Initial release
  • Version 1.1: 2013-09-11
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description