Structure and biochemical studies of the recombination mediator protein RecR in RecFOR pathway

Experimental Data Snapshot

  • Resolution: 2.45 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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RecOR complex including RecR N-N dimer and RecO monomer displays a high affinity for ssDNA

Tang, Q.Gao, P.Liu, Y.P.Gao, A.An, X.M.Liu, S.Yan, X.X.Liang, D.C.

(2012) Nucleic Acids Res 40: 11115-11125

  • DOI: https://doi.org/10.1093/nar/gks889
  • Primary Citation of Related Structures:  
    3VDP, 3VDU, 3VE5

  • PubMed Abstract: 

    RecR is an important recombination mediator protein in the RecFOR pathway. RecR together with RecO and RecF facilitates RecA nucleoprotein filament formation and homologous pairing. Structural and biochemical studies of Thermoanaerobacter tengcongensis RecR (TTERecR) and its series mutants revealed that TTERecR uses the N-N dimer as a basic functional unit to interact with TTERecO monomer. Two TTERecR N-N dimers form a ring-shaped tetramer via an interaction between their C-terminal regions. The tetramer is a result of crystallization only. Hydrophobic interactions between the entire helix-hairpin-helix domains within the N-terminal regions of two TTERecR monomers are necessary for formation of a RecR functional N-N dimer. The TTERecR N-N dimer conformation also affects formation of a hydrophobic patch, which creates a binding site for TTERecO in the TTERecR Toprim domain. In addition, we demonstrate that TTERecR does not bind single-stranded DNA (ssDNA) and binds double-stranded DNA very weakly, whereas TTERecOR complex can stably bind DNA, with a higher affinity for ssDNA than double-stranded DNA. Based on these results, we propose an interaction model for the RecOR:ssDNA complex.

  • Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Recombination protein recR
A, B, C, D
212Caldanaerobacter subterraneus subsp. tengcongensis MB4Mutation(s): 0 
Gene Names: recR
Find proteins for Q8RDI4 (Caldanaerobacter subterraneus subsp. tengcongensis (strain DSM 15242 / JCM 11007 / NBRC 100824 / MB4))
Explore Q8RDI4 
Go to UniProtKB:  Q8RDI4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8RDI4
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on IMD

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
J [auth B]
L [auth C]
F [auth A],
G [auth A],
H [auth A],
J [auth B],
L [auth C],
N [auth D]
C3 H5 N2
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
K [auth C],
M [auth D]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.45 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.26α = 90
b = 68.325β = 92.95
c = 94.056γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
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: 2012-12-19
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Data collection, Database references, Derived calculations