Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 8.00 kDa 
• Atom Count: 581 
• Modelled Residue Count: 66 
• Deposited Residue Count: 73 
• Unique protein chains: 1

4OU0

Crystal Structure of RPA32C

• PDB DOI: 10.2210/pdb4OU0/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2014-02-14 Released: 2014-04-30 
• Deposition Author(s): Feldkamp, M.D., Mason, A.C., Eichman, B.F., Chazin, W.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.238 
• R-Value Work: 0.197 
• R-Value Observed: 0.199 

Literature

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

• PubMed: 24730652 
• DOI: 10.1021/bi500252w
• Primary Citation of Related Structures:  
  4OU0


• 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Replication protein A 32 kDa subunit	A	73	Homo sapiens	Mutation(s): 0  Gene Names: REPA2, RFA2, RPA2, RPA32, RPA34
UniProt & NIH Common Fund Data Resources
Find proteins for P15927 (Homo sapiens) Explore P15927  Go to UniProtKB:  P15927
PHAROS:  P15927

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SCH	A	L-PEPTIDE LINKING	C4 H9 N O2 S2		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.238 
• R-Value Work: 0.197 
• R-Value Observed: 0.199 
• Space Group: P 6₅
• Diffraction Data DOI: 10.15785/SBGRID/92 SBGrid

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.556	α = 90
b = 69.556	β = 90
c = 23.567	γ = 120

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-02-14 
• Released Date: 2014-04-30 
Deposition Author(s): Feldkamp, M.D., Mason, A.C., Eichman, B.F., Chazin, W.J.

Revision History  

• 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