4IVZ

A Y37F mutant of C.Esp1396I bound to its highest affinity operator site OM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Mutagenic Analysis of the RM Controller Protein C.Esp1396I.

Martin, R.N.McGeehan, J.E.Kneale, G.

(2014) Plos One 9: e98365-e98365

  • DOI: 10.1371/journal.pone.0098365
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bacterial restriction-modification (RM) systems are comprised of two complementary enzymatic activities that prevent the establishment of foreign DNA in a bacterial cell: DNA methylation and DNA restriction. These two activities are tightly regulated ...

    Bacterial restriction-modification (RM) systems are comprised of two complementary enzymatic activities that prevent the establishment of foreign DNA in a bacterial cell: DNA methylation and DNA restriction. These two activities are tightly regulated to prevent over-methylation or auto-restriction. Many Type II RM systems employ a controller (C) protein as a transcriptional regulator for the endonuclease gene (and in some cases, the methyltransferase gene also). All high-resolution structures of C-protein/DNA-protein complexes solved to date relate to C.Esp1396I, from which the interactions of specific amino acid residues with DNA bases and/or the phosphate backbone could be observed. Here we present both structural and DNA binding data for a series of mutations to the key DNA binding residues of C.Esp1396I. Our results indicate that mutations to the backbone binding residues (Y37, S52) had a lesser affect on DNA binding affinity than mutations to those residues that bind directly to the bases (T36, R46), and the contributions of each side chain to the binding energies are compared. High-resolution X-ray crystal structures of the mutant and native proteins showed that the fold of the proteins was unaffected by the mutations, but also revealed variation in the flexible loop conformations associated with DNA sequence recognition. Since the tyrosine residue Y37 contributes to DNA bending in the native complex, we have solved the structure of the Y37F mutant protein/DNA complex by X-ray crystallography to allow us to directly compare the structure of the DNA in the mutant and native complexes.


    Related Citations: 
    • Structural analysis of the genetic switch that regulates the expression of restriction-modification genes.
      McGeehan, J.E.,Streeter, S.D.,Thresh, S.J.,Ball, N.,Ravelli, R.B.,Kneale, G.G.
      (2008) Nucleic Acids Res. 36: 4778
    • Transcription regulation of restriction-modification system Esp1396I.
      Bogdanova, E.,Zakharova, M.,Streeter, S.,Taylor, J.,Heyduk, T.,Kneale, G.,Severinov, K.
      (2009) Nucleic Acids Res. 37: 3354
    • Structure of the restriction-modification controller protein C.Esp1396I.
      Ball, N.,Streeter, S.D.,Kneale, G.G.,McGeehan, J.E.
      (2009) Acta Crystallogr.,Sect.D 65: 900
    • Recognition of dual symmetry by the controller protein C.Esp1396I based on the structure of the transcriptional activation complex.
      McGeehan, J.E.,Ball, N.J.,Streeter, S.D.,Thresh, S.J.,Kneale, G.G.
      (2012) Nucleic Acids Res. 40: 4158


    Organizational Affiliation

    Biophysics Laboratories, School of Biological Sciences, Institute of Biomedical and Biomolecular Science, University of Portsmouth, Portsmouth, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Regulatory protein
A, B, E, F
82Enterobacter sp. RFL1396Mutation(s): 1 
Gene Names: esp1396IC
Find proteins for Q8GGH0 (Enterobacter sp. RFL1396)
Go to UniProtKB:  Q8GGH0
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*TP*GP*TP*AP*GP*AP*CP*TP*AP*TP*AP*GP*TP*CP*GP*AP*CP*A)-3')C,G19N/A
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*TP*TP*GP*TP*CP*GP*AP*CP*TP*AP*TP*AP*GP*TP*CP*TP*AP*CP*A)-3')D,H19N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 47.540α = 90.00
b = 146.700β = 93.21
c = 47.790γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
Aimlessdata scaling
MOSFLMdata reduction
GDAdata collection
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-29
    Type: Initial release
  • Version 1.1: 2014-06-18
    Type: Database references