3LFP

Crystal Structure of the Restriction-Modification Controller Protein C.Csp231I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Analysis of a Novel Class of R-M Controller Proteins: C.Csp231I from Citrobacter sp. RFL231.

McGeehan, J.E.Streeter, S.D.Thresh, S.J.Taylor, J.E.Shevtsov, M.B.Kneale, G.G.

(2011) J Mol Biol 409: 177-188

  • DOI: https://doi.org/10.1016/j.jmb.2011.03.033
  • Primary Citation of Related Structures:  
    3LFP, 3LIS

  • PubMed Abstract: 

    Controller proteins play a key role in the temporal regulation of gene expression in bacterial restriction-modification (R-M) systems and are important mediators of horizontal gene transfer. They form the basis of a highly cooperative, concentration-dependent genetic switch involved in both activation and repression of R-M genes. Here we present biophysical, biochemical, and high-resolution structural analysis of a novel class of controller proteins, exemplified by C.Csp231I. In contrast to all previously solved C-protein structures, each protein subunit has two extra helices at the C-terminus, which play a large part in maintaining the dimer interface. The DNA binding site of the protein is also novel, having largely AAAA tracts between the palindromic recognition half-sites, suggesting tight bending of the DNA. The protein structure shows an unusual positively charged surface that could form the basis for wrapping the DNA completely around the C-protein dimer.


  • Organizational Affiliation

    Biophysics Laboratories, Institute of Biomedical and Biomolecular Sciences, School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DY, UK. john.mcgeehan@port.ac.uk


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Csp231I C protein98Citrobacter sp. RFL231Mutation(s): 0 
Gene Names: csp231IC
UniProt
Find proteins for Q32WH4 (Citrobacter sp. RFL231)
Explore Q32WH4 
Go to UniProtKB:  Q32WH4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ32WH4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 
  • Space Group: F 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.37α = 90
b = 137.37β = 90
c = 137.37γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
GDAdata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Refinement description