1NG9

E.coli MutS R697A: an ATPase-asymmetry mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


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

  • DOI: https://doi.org/10.1093/emboj/cdg064
  • Primary Citation of Related Structures:  
    1NG9

  • 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.


  • Organizational Affiliation

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


Macromolecules

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA mismatch repair protein MutSC [auth A],
D [auth B]
800Escherichia coliMutation(s): 1 
Gene Names: MutS
UniProt
Find proteins for P23909 (Escherichia coli (strain K12))
Explore P23909 
Go to UniProtKB:  P23909
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23909
Sequence Annotations
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  • Reference Sequence
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Entity ID: 1
MoleculeChains LengthOrganismImage
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'A [auth E]30N/A
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains LengthOrganismImage
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'B [auth F]30N/A
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.902α = 90
b = 92.404β = 90
c = 261.593γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description