8AG6

human MutSalpha (MSH2/MSH6) binding to DNA with a GT mismatch


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Unexpected moves: a conformational change in MutS alpha enables high-affinity DNA mismatch binding.

Bruekner, S.R.Pieters, W.Fish, A.Liaci, A.M.Scheffers, S.Rayner, E.Kaldenbach, D.Drost, L.Dekker, M.van Hees-Stuivenberg, S.Delzenne-Goette, E.de Konink, C.Houlleberghs, H.Dubbink, H.J.AlSaegh, A.de Wind, N.Forster, F.Te Riele, H.Sixma, T.K.

(2023) Nucleic Acids Res 51: 1173-1188

  • DOI: https://doi.org/10.1093/nar/gkad015
  • Primary Citation of Related Structures:  
    8AG6

  • PubMed Abstract: 

    The DNA mismatch repair protein MutSα recognizes wrongly incorporated DNA bases and initiates their correction during DNA replication. Dysfunctions in mismatch repair lead to a predisposition to cancer. Here, we study the homozygous mutation V63E in MSH2 that was found in the germline of a patient with suspected constitutional mismatch repair deficiency syndrome who developed colorectal cancer before the age of 30. Characterization of the mutant in mouse models, as well as slippage and repair assays, shows a mildly pathogenic phenotype. Using cryogenic electron microscopy and surface plasmon resonance, we explored the mechanistic effect of this mutation on MutSα function. We discovered that V63E disrupts a previously unappreciated interface between the mismatch binding domains (MBDs) of MSH2 and MSH6 and leads to reduced DNA binding. Our research identifies this interface as a 'safety lock' that ensures high-affinity DNA binding to increase replication fidelity. Our mechanistic model explains the hypomorphic phenotype of the V63E patient mutation and other variants in the MBD interface.


  • Organizational Affiliation

    Division of Biochemistry, Netherlands Cancer Institute and Oncode Institute, 1066 CX Amsterdam, The Netherlands.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA mismatch repair protein Msh2934Homo sapiensMutation(s): 0 
Gene Names: MSH2
UniProt & NIH Common Fund Data Resources
Find proteins for P43246 (Homo sapiens)
Explore P43246 
Go to UniProtKB:  P43246
PHAROS:  P43246
GTEx:  ENSG00000095002 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43246
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA mismatch repair protein Msh61,414Homo sapiensMutation(s): 1 
Gene Names: MSH6GTBP
UniProt & NIH Common Fund Data Resources
Find proteins for P52701 (Homo sapiens)
Explore P52701 
Go to UniProtKB:  P52701
PHAROS:  P52701
GTEx:  ENSG00000116062 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52701
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (50-MER)C [auth E]50synthetic construct
Sequence Annotations
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  • Reference Sequence
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Entity ID: 4
MoleculeChains LengthOrganismImage
DNA (50-MER)D [auth F]50synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION4.0
MODEL REFINEMENTPHENIX1.20.1
MODEL REFINEMENTCoot0.9.7

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Netherlands Organisation for Scientific Research (NWO)NetherlandsNOW-TOP 714.016.002
European CommissionEuropean UnionH2020-MSCA-ITN-2016 722433 DNAREPAIRMAN

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-25
    Type: Initial release
  • Version 1.1: 2023-02-08
    Changes: Database references
  • Version 1.2: 2023-03-01
    Changes: Database references
  • Version 1.3: 2024-07-24
    Changes: Data collection, Refinement description