Biochemical and Structural Analysis of the Molybdenum Cofactor Biosynthesis protein MobA

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.179 

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This is version 1.5 of the entry. See complete history


Biochemical and Structural Analysis of the Molybdenum Cofactor Biosynthesis Protein Moba

Guse, A.Stevenson, C.E.M.Kuper, J.Buchanan, G.Schwarz, G.Giordano, G.Magalon, A.Mendel, R.R.Lawson, D.M.Palmer, T.

(2003) J Biol Chem 278: 25302

  • DOI: https://doi.org/10.1074/jbc.M302639200
  • Primary Citation of Related Structures:  
    1H4C, 1H4D, 1H4E, 1HJJ, 1HJL

  • PubMed Abstract: 

    Molybdopterin guanine dinucleotide (MGD) is the form of the molybdenum cofactor that is required for the activity of most bacterial molybdoenzymes. MGD is synthesized from molybdopterin (MPT) and GTP in a reaction catalyzed by the MobA protein. Here we report that wild type MobA can be copurified along with bound MPT and MGD, demonstrating a tight binding of both its substrate and product. To study structure-function relationships, we have constructed a number of site-specific mutations of the most highly conserved amino acid residues of the MobA protein family. Variant MobA proteins were characterized for their ability to support the synthesis of active molybdenum enzymes, to bind MPT and MGD, to interact with the molybdenum cofactor biosynthesis proteins MobB and MoeA. They were also characterized by x-ray structural analysis. Our results suggest an essential role for glycine 15 of MobA, either for GTP binding and/or catalysis, and an involvement of glycine 82 in the stabilization of the product-bound form of the enzyme. Surprisingly, the individual and double substitution of asparagines 180 and 182 to aspartate did not affect MPT binding, catalysis, and product stabilization.

  • Organizational Affiliation

    Departments of Molecular Microbiology and Biological Chemistry, John Innes Centre, Norwich NR4 7UH, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Find proteins for P32173 (Escherichia coli (strain K12))
Explore P32173 
Go to UniProtKB:  P32173
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32173
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.224α = 90
b = 41.752β = 90
c = 54.514γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-05-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-04-03
    Changes: Data collection, Experimental preparation, Other
  • Version 1.4: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 1.5: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description