Crystal structure of MoaB from Escherichia coli

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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Structure of the molybdenum-cofactor biosynthesis protein MoaB of Escherichia coli.

Bader, G.Gomez-Ortiz, M.Haussmann, C.Bacher, A.Huber, R.Fischer, M.

(2004) Acta Crystallogr D Biol Crystallogr 60: 1068-1075

  • DOI: https://doi.org/10.1107/S0907444904007164
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The moaABC operon of Escherichia coli is involved in early steps of the biosynthesis of the molybdenum-binding cofactor molybdopterin, but the precise functions of the cognate proteins are not known. The crystal structure of the MoaB protein from E. coli was determined by multiple anomalous dispersion at 2.1 angstroms A resolution and refined to an R factor of 20.4% (Rfree = 25.0%). The protein is a 32-symmetric hexamer, with the monomers consisting of a central beta-sheet flanked by helices on both sides. The overall fold of the monomer is similar to those of the MogA protein of E. coli, the G-domains of rat and human gephyrin and the G-domains of Cnx1 protein from A. thaliana, all of which are involved in the insertion of an unknown molybdenum species into molybdopterin to form the molybdenum cofactor. Furthermore, the MoaB protein shows significant sequence similarity to the cinnamon protein from Drosophila melanogaster. In addition to other functions, all these proteins are involved in the biosynthesis of the molybdenum cofactor and have been shown to bind molybdopterin. The close structural homology to MogA and the gephyrin and Cnx1 domains suggests that MoaB may bind a hitherto unidentified pterin compound, possibly an intermediate in molybdopterin biosynthesis.

  • Organizational Affiliation

    Abteilung Strukturforschung, Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Martinsried, Germany. gerd.bader@vie.boehringer-ingelheim.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Molybdenum cofactor biosynthesis protein BA [auth B],
B [auth A]
169Escherichia coliMutation(s): 2 
Gene Names: MOABCHLA2B0782Z1001ECS0860
Find proteins for P0AEZ9 (Escherichia coli (strain K12))
Explore P0AEZ9 
Go to UniProtKB:  P0AEZ9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEZ9
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A [auth B],
B [auth A]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.881α = 90
b = 69.881β = 90
c = 126.912γ = 120
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: 2004-06-01
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance