1U94

Crystal Structure of E. Coli RecA in a Compressed Helical Filament Form 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of Escherichia coli RecA in a compressed helical filament.

Xing, X.Bell, C.E.

(2004) J Mol Biol 342: 1471-1485

  • DOI: 10.1016/j.jmb.2004.07.091
  • Primary Citation of Related Structures:  
    1U94, 1U99, 1U98

  • PubMed Abstract: 
  • The X-ray crystal structure of uncomplexed Escherichia coli RecA protein has been determined in three new crystal forms at resolutions of 1.9 A, 2.0 A, and 2.6 A. The RecA protein used for this study contains the extra residues Gly-Ser-His-Met at the ...

    The X-ray crystal structure of uncomplexed Escherichia coli RecA protein has been determined in three new crystal forms at resolutions of 1.9 A, 2.0 A, and 2.6 A. The RecA protein used for this study contains the extra residues Gly-Ser-His-Met at the N terminus, but retains normal ssDNA-dependent ATPase and coprotease activities. In all three crystals, RecA is packed in a right-handed helical filament with a pitch of approximately 74 A. These RecA filaments are compressed relative to the original crystal structure of RecA, which has a helical pitch of 82.7 A. In the structures of the compressed RecA filament, the monomer-monomer interface and the core domain are essentially the same as in the RecA structure with the 83 A pitch. The change in helical pitch is accommodated by a small movement of the N-terminal domain, which is reoriented to preserve the contacts it makes at the monomer-monomer interface. The new crystal structures show significant variation in the orientation and conformation of the C-terminal domain, as well as in the inter-filament packing interactions. In crystal form 2, a calcium ion is bound closely to a beta-hairpin of the C-terminal domain and to Asp38 of a neighboring filament, and residues 329-331 of the C-terminal tail become ordered to contact a neighboring filament. In crystal forms 3 and 4, a sulfate ion or a phosphate anion is bound to the same site on RecA as the beta-phosphate group of ADP, causing an opening of the P-loop. Altogether, the structures show the conformational variability of RecA protein in the crystalline state, providing insight into many aspects of RecA function.


    Organizational Affiliation

    Department of Molecular and Cellular Biochemistry, Ohio State University College of Medicine and Public Health, 371 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RecA proteinA356Escherichia coliMutation(s): 0 
Gene Names: recA
Find proteins for P0A7G6 (Escherichia coli (strain K12))
Explore P0A7G6 
Go to UniProtKB:  P0A7G6
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.854α = 90
b = 105.854β = 90
c = 73.496γ = 120
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2004-08-09 
  • Released Date: 2004-09-21 
  • Deposition Author(s): Xing, X., Bell, C.E.

Revision History 

  • Version 1.0: 2004-09-21
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance