Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Crystal structure of LexA: a conformational switch for regulation of self-cleavage.

Luo, Y.Pfuetzner, R.A.Mosimann, S.Paetzel, M.Frey, E.A.Cherney, M.Kim, B.Little, J.W.Strynadka, N.C.

(2001) Cell 106: 585-594

  • DOI: https://doi.org/10.1016/s0092-8674(01)00479-2
  • Primary Citation of Related Structures:  
    1JHC, 1JHE, 1JHF, 1JHH

  • PubMed Abstract: 

    LexA repressor undergoes a self-cleavage reaction. In vivo, this reaction requires an activated form of RecA, but it occurs spontaneously in vitro at high pH. Accordingly, LexA must both allow self-cleavage and yet prevent this reaction in the absence of a stimulus. We have solved the crystal structures of several mutant forms of LexA. Strikingly, two distinct conformations are observed, one compatible with cleavage, and the other in which the cleavage site is approximately 20 A from the catalytic center. Our analysis provides insight into the structural and energetic features that modulate the interconversion between these two forms and hence the rate of the self-cleavage reaction. We suggest RecA activates the self-cleavage of LexA and related proteins through selective stabilization of the cleavable conformation.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, 2146 Health Sciences Mall, Vancouver, British Columbia, V6T 1Z3, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LEXA REPRESSOR137Escherichia coliMutation(s): 1 
Gene Names: LexA
Find proteins for P0A7C2 (Escherichia coli (strain K12))
Explore P0A7C2 
Go to UniProtKB:  P0A7C2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A7C2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.230 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.88α = 90
b = 49.88β = 90
c = 103.2γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-09-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description