1WB9

Crystal Structure of E. coli DNA Mismatch Repair enzyme MutS, E38T mutant, in complex with a G.T mismatch


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Dual Role of Muts Glutamate 38 in DNA Mismatch Discrimination and in the Authorization of Repair.

Lebbink, J.H.G.Georgijevic, D.Natrajan, G.Fish, A.Winterwerp, H.H.K.Sixma, T.K.De Wind, N.

(2006) EMBO J 25: 409

  • DOI: 10.1038/sj.emboj.7600936
  • Primary Citation of Related Structures:  
    1WB9, 1WBB, 1WBD

  • PubMed Abstract: 
  • MutS plays a critical role in DNA mismatch repair in Escherichia coli by binding to mismatches and initiating repair in an ATP-dependent manner. Mutational analysis of a highly conserved glutamate, Glu38, has revealed its role in mismatch recognition by enabling MutS to discriminate between homoduplex and mismatched DNA ...

    MutS plays a critical role in DNA mismatch repair in Escherichia coli by binding to mismatches and initiating repair in an ATP-dependent manner. Mutational analysis of a highly conserved glutamate, Glu38, has revealed its role in mismatch recognition by enabling MutS to discriminate between homoduplex and mismatched DNA. Crystal structures of MutS have shown that Glu38 forms a hydrogen bond to one of the mismatched bases. In this study, we have analyzed the crystal structures, DNA binding and the response to ATP binding of three Glu38 mutants. While confirming the role of the negative charge in initial discrimination, we show that in vivo mismatch repair can proceed even when discrimination is low. We demonstrate that the formation of a hydrogen bond by residue 38 to the mismatched base authorizes repair by inducing intramolecular signaling, which results in the inhibition of rapid hydrolysis of distally bound ATP. This allows formation of the stable MutS-ATP-DNA clamp, a key intermediate in triggering downstream repair events.


    Organizational Affiliation

    Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA MISMATCH REPAIR PROTEIN MUTSA, B800Escherichia coliMutation(s): 1 
Find proteins for P23909 (Escherichia coli (strain K12))
Explore P23909 
Go to UniProtKB:  P23909
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-D(*AP*GP*CP*TP*GP*CP*CP*AP*GP*GP *CP*AP*CP*CP*AP*GP*TP*G)-3'C [auth E]18N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      5'-D(*AP*CP*TP*GP*GP*TP*GP*CP*TP*TP *GP*GP*CP*AP*GP*CP*T)-3'D [auth F]17Escherichia coli
      Small Molecules
      Ligands 2 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      ADP
      Query on ADP

      Download Ideal Coordinates CCD File 
      E [auth A]ADENOSINE-5'-DIPHOSPHATE
      C10 H15 N5 O10 P2
      XTWYTFMLZFPYCI-KQYNXXCUSA-N
       Ligand Interaction
      MG
      Query on MG

      Download Ideal Coordinates CCD File 
      F [auth A]MAGNESIUM ION
      Mg
      JLVVSXFLKOJNIY-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.10 Å
      • R-Value Free: 0.234 
      • R-Value Work: 0.189 
      • R-Value Observed: 0.190 
      • Space Group: P 21 21 21
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 89.65α = 90
      b = 92.116β = 90
      c = 260.744γ = 90
      Software Package:
      Software NamePurpose
      REFMACrefinement
      DENZOdata reduction
      SCALEPACKdata scaling

      Structure Validation

      View Full Validation Report



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2006-01-18
        Type: Initial release
      • Version 1.1: 2011-07-13
        Changes: Advisory, Version format compliance