4L60

Structure of C81R Mutant PCNA Protein Defective in Mismatch Repair


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.003 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Distinct structural alterations in proliferating cell nuclear antigen block DNA mismatch repair.

Dieckman, L.M.Boehm, E.M.Hingorani, M.M.Washington, M.T.

(2013) Biochemistry 52: 5611-5619

  • DOI: 10.1021/bi400378e
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • During DNA replication, mismatches and small loops in the DNA resulting from insertions or deletions are repaired by the mismatch repair (MMR) machinery. Proliferating cell nuclear antigen (PCNA) plays an important role in both mismatch-recognition a ...

    During DNA replication, mismatches and small loops in the DNA resulting from insertions or deletions are repaired by the mismatch repair (MMR) machinery. Proliferating cell nuclear antigen (PCNA) plays an important role in both mismatch-recognition and resynthesis stages of MMR. Previously, two mutant forms of PCNA were identified that cause defects in MMR with little, if any, other defects. The C22Y mutant PCNA protein completely blocks MutSα-dependent MMR, and the C81R mutant PCNA protein partially blocks both MutSα-dependent and MutSβ-dependent MMR. In order to understand the structural and mechanistic basis by which these two amino acid substitutions in PCNA proteins block MMR, we solved the X-ray crystal structures of both mutant proteins and carried out further biochemical studies. We found that these amino acid substitutions lead to subtle, distinct structural changes in PCNA. The C22Y substitution alters the positions of the α-helices lining the central hole of the PCNA ring, whereas the C81R substitution creates a distortion in an extended loop near the PCNA subunit interface. We conclude that the structural integrity of the α-helices lining the central hole and this loop are both necessary to form productive complexes with MutSα and mismatch-containing DNA.


    Organizational Affiliation

    Department of Biochemistry, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proliferating cell nuclear antigen
A
256Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 1 
Gene Names: POL30
Find proteins for P15873 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P15873
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.003 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.198 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 121.822α = 90.00
b = 121.822β = 90.00
c = 121.822γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
d*TREKdata scaling
PHENIXphasing
PHENIXmodel building
PHENIXrefinement
d*TREKdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-02
    Type: Initial release
  • Version 1.1: 2014-11-05
    Type: Database references