1H4C

Biochemical and Structural Analysis of the Molybdenum Cofactor Biosynthesis protein MobA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1074/jbc.M302639200
  • Primary Citation of Related Structures:  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 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MOLYBDOPTERIN-GUANINE DINUCLEOTIDE BIOSYNTHESIS PROTEIN A
A
201Escherichia coli (strain K12)Gene Names: mobA (chlB, mob, narB)
EC: 2.7.7.77
Find proteins for P32173 (Escherichia coli (strain K12))
Go to UniProtKB:  P32173
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
LI
Query on LI

Download SDF File 
Download CCD File 
A
LITHIUM ION
Li
HBBGRARXTFLTSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.176 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 76.465α = 90.00
b = 41.737β = 90.00
c = 54.540γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance