Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 198404.36 
• Atom Count: 13056 
• Residue Count: 1660 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

1NG9

E.coli MutS R697A: an ATPase-asymmetry mutant

• DOI: 10.2210/pdb1NG9/pdb
• NDB: PD0367

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2002-12-17 Released: 2003-02-11 
• Deposition Author(s): Lamers, M.H., Winterwerp, H.H.K., Sixma, T.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.249 
• R-Value Work: 0.215 

Literature

The alternating ATPase domains of MutS control DNA mismatch repair

Lamers, M.H., Winterwerp, H.H.K., Sixma, T.K.

(2003) Embo J. 22: 746-756

• PubMed: 12554674 
• DOI: 10.1093/emboj/cdg064


• PubMed Abstract: 
  

DNA mismatch repair is an essential safeguard of genomic integrity by removing base mispairings that may arise from DNA polymerase errors or from homologous recombination between DNA strands. In Escherichia coli, the MutS enzyme recognizes mismatches and initiates repair. MutS has an intrinsic ATPase activity crucial for its function, but which is poorly understood. We show here that within the MutS homodimer, the two chemically identical ATPase sites have different affinities for ADP, and the two sites alternate in ATP hydrolysis. A single residue, Arg697, located at the interface of the two ATPase domains, controls the asymmetry. When mutated, the asymmetry is lost and mismatch repair in vivo is impaired. We propose that asymmetry of the ATPase domains is an essential feature of mismatch repair that controls the timing of the different steps in the repair cascade.

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Organizational Affiliation: 

Division of Molecular Carcinogenesis, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
DNA mismatch repair protein MutS	A, B	800	Escherichia coli (strain K12)	Mutation(s): 1  Gene Names: mutS (fdv)
Find proteins for P23909 (Escherichia coli (strain K12)) Go to UniProtKB:  P23909

Entity ID: 1
Molecule	Chains	Length	Organism
5'-D(*AP*GP*CP*TP*GP*CP*CP*AP*GP*GP*CP*AP*CP*CP*AP*GP*TP*GP*TP*CP*AP*GP*CP*GP*TP*CP*CP*TP*AP*T)-3'	E	30	N/A

Entity ID: 2
Molecule	Chains	Length	Organism
5'-D(*AP*TP*AP*GP*GP*AP*CP*GP*CP*TP*GP*AP*CP*AP*CP*TP*GP*GP*TP*GP*CP*TP*TP*GP*GP*CP*AP*GP*CP*T)-3'	F	30	N/A

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ADP	A, B	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	A, B	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
DNA	Kd: 9600 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.249 
• R-Value Work: 0.215 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 89.902	α = 90.00
b = 92.404	β = 90.00
c = 261.593	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
CCP4	data scaling
SCALA	data scaling
MOLREP	phasing
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-12-17 
• Released Date: 2003-02-11 
• Deposition Author(s): Lamers, M.H., Winterwerp, H.H.K., Sixma, T.K.

Revision History 

• Version 1.0: 2003-02-11
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Advisory, Version format compliance