6Z2W

Mec1-Ddc2 (F2244L mutant) in complex with Mg AMP-PNP


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.82 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Mechanism of auto-inhibition and activation of Mec1 ATR checkpoint kinase.

Tannous, E.A.Yates, L.A.Zhang, X.Burgers, P.M.

(2021) Nat Struct Mol Biol 28: 50-61

  • DOI: 10.1038/s41594-020-00522-0
  • Primary Citation of Related Structures:  
    6Z2W, 6Z2X, 6Z3A

  • PubMed Abstract: 
  • In response to DNA damage or replication fork stalling, the basal activity of Mec1 ATR is stimulated in a cell-cycle-dependent manner, leading to cell-cycle arrest and the promotion of DNA repair. Mec1 ATR dysfunction leads to cell death in yeast and causes chromosome instability and embryonic lethality in mammals ...

    In response to DNA damage or replication fork stalling, the basal activity of Mec1 ATR is stimulated in a cell-cycle-dependent manner, leading to cell-cycle arrest and the promotion of DNA repair. Mec1 ATR dysfunction leads to cell death in yeast and causes chromosome instability and embryonic lethality in mammals. Thus, ATR is a major target for cancer therapies in homologous recombination-deficient cancers. Here we identify a single mutation in Mec1, conserved in ATR, that results in constitutive activity. Using cryo-electron microscopy, we determine the structures of this constitutively active form (Mec1(F2244L)-Ddc2) at 2.8 Å and the wild type at 3.8 Å, both in complex with Mg 2+ -AMP-PNP. These structures yield a near-complete atomic model for Mec1-Ddc2 and uncover the molecular basis for low basal activity and the conformational changes required for activation. Combined with biochemical and genetic data, we discover key regulatory regions and propose a Mec1 activation mechanism.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, MO, USA. burgers@wustl.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA damage checkpoint protein LCD1B [auth C],
A [auth D]
747Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: LCD1DDC2PIE1YDR499W
UniProt
Find proteins for Q04377 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q04377 
Go to UniProtKB:  Q04377
Entity Groups  
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UniProt GroupQ04377
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein kinase MEC1C [auth E],
D [auth F]
2,368Saccharomyces cerevisiae S288CMutation(s): 1 
Gene Names: MEC1ESR1SAD3YBR136WYBR1012
EC: 2.7.11.1
UniProt
Find proteins for P38111 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P38111 
Go to UniProtKB:  P38111
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UniProt GroupP38111
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.82 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom210658/Z/18/Z

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-11
    Type: Initial release
  • Version 1.1: 2020-11-18
    Changes: Database references
  • Version 1.2: 2020-12-30
    Changes: Structure summary
  • Version 1.3: 2021-01-20
    Changes: Database references
  • Version 1.4: 2021-02-10
    Changes: Database references