N-terminal domain of the RPA70 subunit of human replication protein A.

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Single-stranded DNA mimicry in the p53 transactivation domain interaction with replication protein A.

Bochkareva, E.Kaustov, L.Ayed, A.Yi, G.S.Lu, Y.Pineda-Lucena, A.Liao, J.C.Okorokov, A.L.Milner, J.Arrowsmith, C.H.Bochkarev, A.

(2005) Proc Natl Acad Sci U S A 102: 15412-15417

  • DOI: https://doi.org/10.1073/pnas.0504614102
  • Primary Citation of Related Structures:  
    2B29, 2B3G

  • PubMed Abstract: 

    One of many protein-protein interactions modulated upon DNA damage is that of the single-stranded DNA-binding protein, replication protein A (RPA), with the p53 tumor suppressor. Here we report the crystal structure of RPA residues 1-120 (RPA70N) bound to the N-terminal transactivation domain of p53 (residues 37-57; p53N) and, by using NMR spectroscopy, characterize two mechanisms by which the RPA/p53 interaction can be modulated. RPA70N forms an oligonucleotide/oligosaccharide-binding fold, similar to that previously observed for the ssDNA-binding domains of RPA. In contrast, the N-terminal p53 transactivation domain is largely disordered in solution, but residues 37-57 fold into two amphipathic helices, H1 and H2, upon binding with RPA70N. The H2 helix of p53 structurally mimics the binding of ssDNA to the oligonucleotide/oligosaccharide-binding fold. NMR experiments confirmed that both ssDNA and an acidic peptide mimicking a phosphorylated form of RPA32N can independently compete the acidic p53N out of the binding site. Taken together, our data suggest a mechanism for DNA damage signaling that can explain a threshold response to DNA damage.

  • Organizational Affiliation

    Banting and Best Department of Medical Research & Department of Medical Genetics and Microbiology, University of Toronto, 112 College Street, Toronto, Ontario, Canada M5G 1L6.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Replication protein A 70 kDa DNA-binding subunit123Homo sapiensMutation(s): 0 
Gene Names: RPA1REPA1RPA70
UniProt & NIH Common Fund Data Resources
Find proteins for P27694 (Homo sapiens)
Explore P27694 
Go to UniProtKB:  P27694
PHAROS:  P27694
GTEx:  ENSG00000132383 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27694
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.692α = 90
b = 57.692β = 90
c = 63.518γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-04
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references