6D0R

Structure of a DNA retention-prone PCNA variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Effective mismatch repair depends on timely control of PCNA retention on DNA by the Elg1 complex.

Paul Solomon Devakumar, L.J.Gaubitz, C.Lundblad, V.Kelch, B.A.Kubota, T.

(2019) Nucleic Acids Res 47: 6826-6841

  • DOI: 10.1093/nar/gkz441
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Proliferating cell nuclear antigen (PCNA) is a sliding clamp that acts as a central co-ordinator for mismatch repair (MMR) as well as DNA replication. Loss of Elg1, the major subunit of the PCNA unloader complex, causes over-accumulation of PCNA on D ...

    Proliferating cell nuclear antigen (PCNA) is a sliding clamp that acts as a central co-ordinator for mismatch repair (MMR) as well as DNA replication. Loss of Elg1, the major subunit of the PCNA unloader complex, causes over-accumulation of PCNA on DNA and also increases mutation rate, but it has been unclear if the two effects are linked. Here we show that timely removal of PCNA from DNA by the Elg1 complex is important to prevent mutations. Although premature unloading of PCNA generally increases mutation rate, the mutator phenotype of elg1Δ is attenuated by PCNA mutants PCNA-R14E and PCNA-D150E that spontaneously fall off DNA. In contrast, the elg1Δ mutator phenotype is exacerbated by PCNA mutants that accumulate on DNA due to enhanced electrostatic PCNA-DNA interactions. Epistasis analysis suggests that PCNA over-accumulation on DNA interferes with both MMR and MMR-independent process(es). In elg1Δ, over-retained PCNA hyper-recruits the Msh2-Msh6 mismatch recognition complex through its PCNA-interacting peptide motif, causing accumulation of MMR intermediates. Our results suggest that PCNA retention controlled by the Elg1 complex is critical for efficient MMR: PCNA needs to be on DNA long enough to enable MMR, but if it is retained too long it interferes with downstream repair steps.


    Organizational Affiliation

    Institute of Medical Sciences, School of Medicine, Medical Sciences & Nutrition, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proliferating cell nuclear antigenA264Saccharomyces cerevisiae S288CMutation(s): 1 
Gene Names: POL30YBR088CYBR0811
Find proteins for P15873 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P15873 
Go to UniProtKB:  P15873
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.86 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.716α = 90
b = 121.716β = 90
c = 121.716γ = 90
Software Package:
Software NamePurpose
Cootmodel building
PHENIXrefinement
PHASERphasing
HKL-3000data reduction
HKL-3000data scaling
HKL-3000data collection

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
American Cancer SocietyUnited States440685
Swiss National Science FoundationUnited States168972

Revision History 

  • Version 1.0: 2019-05-15
    Type: Initial release
  • Version 1.1: 2019-06-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-07-31
    Changes: Data collection, Database references