1QUQ

COMPLEX OF REPLICATION PROTEIN A SUBUNITS RPA14 AND RPA32


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.212 
  • R-Value Observed: 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
  • Primary Citation of Related Structures:  
    1QUQ

  • 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (REPLICATION PROTEIN A 32 KD SUBUNIT)AC129Homo sapiensMutation(s): 0 
Gene Names: RPA2REPA2RPA32RPA34
Find proteins for P15927 (Homo sapiens)
Explore P15927 
Go to UniProtKB:  P15927
NIH Common Fund Data Resources
PHAROS  P15927
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (REPLICATION PROTEIN A 14 KD SUBUNIT)BD121Homo sapiensMutation(s): 0 
Gene Names: RPA3REPA3RPA14
Find proteins for P35244 (Homo sapiens)
Explore P35244 
Go to UniProtKB:  P35244
NIH Common Fund Data Resources
PHAROS  P35244
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.212 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.7α = 90
b = 76.6β = 90
c = 119.4γ = 90
Software Package:
Software NamePurpose
SnBphasing
PHASESphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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