Crystal Structure of RPA32C

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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This is version 1.3 of the entry. See complete history


Structural Analysis of Replication Protein A Recruitment of the DNA Damage Response Protein SMARCAL1.

Feldkamp, M.D.Mason, A.C.Eichman, B.F.Chazin, W.J.

(2014) Biochemistry 53: 3052-3061

  • DOI: https://doi.org/10.1021/bi500252w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    SWI/SNF-related, matrix-associated, actin-dependent regulator of chromatin, subfamily A-like1 (SMARCAL1) is a recently identified DNA damage response protein involved in remodeling stalled replication forks. The eukaryotic single-strand DNA binding protein replication protein A (RPA) recruits SMARCAL1 to stalled forks in vivo and facilitates regression of forks containing leading strand gaps. Both activities are mediated by a direct interaction between an RPA binding motif (RBM) at the N-terminus of SMARCAL1 and the C-terminal winged-helix domain of the RPA 32 kDa subunit (RPA32C). Here we report a biophysical and structural characterization of the SMARCAL1-RPA interaction. Isothermal titration calorimetry and circular dichroism spectroscopy revealed that RPA32C binds SMARCAL1-RBM with a Kd of 2.5 μM and induces a disorder-to-helix transition. The crystal structure of RPA32C was refined to 1.4 Å resolution, and the SMARCAL1-RBM binding site was mapped on the structure on the basis of nuclear magnetic resonance chemical shift perturbations. Conservation of the interaction surface to other RBM-containing proteins allowed construction of a model for the RPA32C/SMARCAL1-RBM complex. The implications of our results are discussed with respect to the recruitment of SMARCAL1 and other DNA damage response and repair proteins to stalled replication forks.

  • Organizational Affiliation

    Department of Biochemistry, ‡Department of Biological Sciences, §Department of Chemistry, and ∥Center for Structural Biology, Vanderbilt University , Nashville, Tennessee 37232, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Replication protein A 32 kDa subunit73Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P15927 (Homo sapiens)
Explore P15927 
Go to UniProtKB:  P15927
GTEx:  ENSG00000117748 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15927
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SCH
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.556α = 90
b = 69.556β = 90
c = 23.567γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-30
    Type: Initial release
  • Version 1.1: 2014-06-04
    Changes: Database references
  • Version 1.2: 2015-12-09
    Changes: Structure summary
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description