Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Dihedral - D4  (3D View)
Global Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 22372.43 
• Atom Count: 1493 
• Residue Count: 194 
• Unique protein chains: 1

1FRW

STRUCTURE OF E. COLI MOBA WITH BOUND GTP AND MANGANESE

• DOI: 10.2210/pdb1FRW/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli


• Deposited: 2000-09-07 Released: 2001-01-10 
• Deposition Author(s): Lake, M.W., Temple, C.A., Rajagopalan, K.V., Schindelin, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.226 
• R-Value Work: 0.183 

Literature

The crystal structure of the Escherichia coli MobA protein provides insight into molybdopterin guanine dinucleotide biosynthesis.

Lake, M.W., Temple, C.A., Rajagopalan, K.V., Schindelin, H.

(2000) J.Biol.Chem. 275: 40211-40217

• PubMed: 10978347 
• DOI: 10.1074/jbc.M007406200
• Primary Citation of Related Structures:  
  1FR9


• PubMed Abstract: 
  

The molybdenum cofactor (Moco) is found in a variety of enzymes present in all phyla and comprises a family of related molecules containing molybdopterin (MPT), a tricyclic pyranopterin with a cis-dithiolene group, as the invariant essential moiety. MPT biosynthesis involves a conserved pathway, but some organisms perform additional reactions that modify MPT. In eubacteria, the cofactor is often present in a dinucleotide form combining MPT and a purine or pyrimidine nucleotide via a pyrophosphate linkage. In Escherichia coli, the MobA protein links a guanosine 5'-phosphate to MPT forming molybdopterin guanine dinucleotide. This reaction requires GTP, MgCl(2), and the MPT form of the cofactor and can efficiently reconstitute Rhodobacter sphaeroides apo-DMSOR, an enzyme that requires molybdopterin guanine dinucleotide for activity. In this paper, we present the crystal structure of MobA, a protein containing 194 amino acids. The MobA monomer has an alpha/beta architecture in which the N-terminal half of the molecule adopts a Rossman fold. The structure of MobA has striking similarity to Bacillus subtilis SpsA, a nucleotide-diphospho-sugar transferase involved in sporulation. The cocrystal structure of MobA and GTP reveals that the GTP-binding site is located in the N-terminal half of the molecule. Conserved residues located primarily in three signature sequence motifs form crucial interactions with the bound nucleotide. The binding site for MPT is located adjacent to the GTP-binding site in the C-terminal half of the molecule, which contains another set of conserved residues presumably involved in MPT binding.

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Organizational Affiliation: 

Department of Biochemistry and Center for Structural Biology, State University of New York at Stony Brook, Stony Brook, New York 11794-5215, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MOLYBDOPTERIN-GUANINE DINUCLEOTIDE BIOSYNTHESIS PROTEIN	A	194	Escherichia coli (strain K12)	Mutation(s): 0  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 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MN	A	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
ACT	A	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
GTP	A	GUANOSINE-5'-TRIPHOSPHATE C10 H16 N5 O14 P3 XKMLYUALXHKNFT-UUOKFMHZSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.226 
• R-Value Work: 0.183 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 124.387	α = 90.00
b = 124.387	β = 90.00
c = 67.399	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
SHARP	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-09-07 
• Released Date: 2001-01-10 
• Deposition Author(s): Lake, M.W., Temple, C.A., Rajagopalan, K.V., Schindelin, H.

Revision History 

• Version 1.0: 2001-01-10
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance