1QUQ

COMPLEX OF REPLICATION PROTEIN A SUBUNITS RPA14 AND RPA32


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The crystal structure of the complex of replication protein A subunits RPA32 and RPA14 reveals a mechanism for single-stranded DNA binding.

Bochkarev, A.Bochkareva, E.Frappier, L.Edwards, A.M.

(1999) EMBO J. 18: 4498-4504

  • DOI: 10.1093/emboj/18.16.4498

  • PubMed Abstract: 
  • Replication protein A (RPA), the eukaryote single-stranded DNA-binding protein (SSB), is a heterotrimer. The largest subunit, RPA70, which harbours the major DNA-binding activity, has two DNA-binding domains that each adopt an OB-fold. The complex of ...

    Replication protein A (RPA), the eukaryote single-stranded DNA-binding protein (SSB), is a heterotrimer. The largest subunit, RPA70, which harbours the major DNA-binding activity, has two DNA-binding domains that each adopt an OB-fold. The complex of the two smaller subunits, RPA32 and RPA14, has weak DNA-binding activity but the mechanism of DNA binding is unknown. We have determined the crystal structure of the proteolytic core of RPA32 and RPA14, which consists of the central two-thirds of RPA32 and the entire RPA14 subunit. The structure revealed that RPA14 and the central part of RPA32 are structural homologues. Each subunit contains a central OB-fold domain, which also resembles the DNA-binding domains in RPA70; an N-terminal extension that interacts with the central OB-fold domain; and a C-terminal helix that mediate heterodimerization via a helix-helix interaction. The OB-fold of RPA32, but not RPA14, possesses additional similarity to the RPA70 DNA-binding domains, supporting a DNA-binding role for RPA32. The discovery of a third and fourth OB-fold in RPA suggests that the quaternary structure of SSBs, which in Bacteria and Archaea are also tetramers of OB-folds, is conserved in evolution. The structure also suggests a mechanism for RPA trimer formation.


    Related Citations: 
    • The Rpa32 Subunit of Human Replication Protein a Contains a Single-Stranded DNA-Binding Domain.
      Bochkareva, E.,Frappier, L.,Edwards, A.M.,Bochkarev, A.
      (1998) J.Biol.Chem. 273: 3932


    Organizational Affiliation

    Department of Medical Genetics and Microbiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (REPLICATION PROTEIN A 32 KD SUBUNIT)
A, C
129Homo sapiensGene Names: RPA2 (REPA2, RPA32, RPA34)
Find proteins for P15927 (Homo sapiens)
Go to Gene View: RPA2
Go to UniProtKB:  P15927
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (REPLICATION PROTEIN A 14 KD SUBUNIT)
B, D
121Homo sapiensGene Names: RPA3 (REPA3, RPA14)
Find proteins for P35244 (Homo sapiens)
Go to Gene View: RPA3
Go to UniProtKB:  P35244
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 65.700α = 90.00
b = 76.600β = 90.00
c = 119.400γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
PHASESphasing
SnBphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-08-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description, Structure summary