Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 199.14 kDa 
• Atom Count: 13547 
• Modelled Residue Count: 1675 
• Deposited Residue Count: 1788 
• Unique protein chains: 1

3PVS

Structure and biochemical activities of Escherichia coli MgsA

• DOI: 10.2210/pdb3PVS/pdb

• Classification: RECOMBINATION
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-12-07 Released: 2011-02-02 
• Deposition Author(s): Page, A.N., George, N.P., Marceau, A.H., Cox, M.M., Keck, J.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.266 
• R-Value Work: 0.195 
• R-Value Observed: 0.198 

Literature

Structure and Biochemical Activities of Escherichia coli MgsA.

Page, A.N., George, N.P., Marceau, A.H., Cox, M.M., Keck, J.L.

(2011) J Biol Chem 286: 12075-12085

• PubMed: 21297161 
• DOI: 10.1074/jbc.M110.210187
• Primary Citation of Related Structures:  
  3PVS


• PubMed Abstract: 
  

Bacterial "maintenance of genome stability protein A" (MgsA) and related eukaryotic enzymes play important roles in cellular responses to stalled DNA replication processes. Sequence information identifies MgsA enzymes as members of the clamp loader clade of AAA+ proteins, but structural information defining the family has been limited. Here, the x-ray crystal structure of Escherichia coli MgsA is described, revealing a homotetrameric arrangement for the protein that distinguishes it from other clamp loader clade AAA+ proteins. Each MgsA protomer is composed of three elements as follows: ATP-binding and helical lid domains (conserved among AAA+ proteins) and a tetramerization domain. Although the tetramerization domains bury the greatest amount of surface area in the MgsA oligomer, each of the domains participates in oligomerization to form a highly intertwined quaternary structure. Phosphate is bound at each AAA+ ATP-binding site, but the active sites do not appear to be in a catalytically competent conformation due to displacement of Arg finger residues. E. coli MgsA is also shown to form a complex with the single-stranded DNA-binding protein through co-purification and biochemical studies. MgsA DNA-dependent ATPase activity is inhibited by single-stranded DNA-binding protein. Together, these structural and biochemical observations provide insights into the mechanisms of MgsA family AAA+ proteins.

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Organizational Affiliation: 

Department of Biochemistry, University of Wisconsin, School of Medicine and Public Health, Madision, WI 53706, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Replication-associated recombination protein A	A, B, C, D	447	Escherichia coli	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	A, B, C, D	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.266 
• R-Value Work: 0.195 
• R-Value Observed: 0.198 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 99.946	α = 90
b = 143.689	β = 90
c = 163.186	γ = 90

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-12-07 
• Released Date: 2011-02-02 
Deposition Author(s): Page, A.N., George, N.P., Marceau, A.H., Cox, M.M., Keck, J.L.

Revision History  

• Version 1.0: 2011-02-02
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance