1LQC

LAC REPRESSOR HEADPIECE (RESIDUES 1-56), NMR, 32 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 32 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Refined structure of lac repressor headpiece (1-56) determined by relaxation matrix calculations from 2D and 3D NOE data: change of tertiary structure upon binding to the lac operator.

Slijper, M.Bonvin, A.M.Boelens, R.Kaptein, R.

(1996) J.Mol.Biol. 259: 761-773

  • DOI: 10.1006/jmbi.1996.0356

  • PubMed Abstract: 
  • The solution structure of the DNA binding domain of lac repressor (headpiece 1-56; HP56) has been refined using data from 2D and 3D NMR spectroscopy. The structure was derived from 1546 restraints (giving an average of 27.6 per residue), comprising 3 ...

    The solution structure of the DNA binding domain of lac repressor (headpiece 1-56; HP56) has been refined using data from 2D and 3D NMR spectroscopy. The structure was derived from 1546 restraints (giving an average of 27.6 per residue), comprising 389 intraresidual, 402 sequential, 385 medium range and 325 long range distance restraints and also 30 phi and 15 chi 1 dihedral angle restraints. The structures were determined by the method of direct refinement against nuclear Overhauser enhancement peak volumes with the program DINOSAUR. The final set of 32 selected structures displayed an r.m.s. deviation from the average of 0.43(+/-0.08) A angstroms (backbone) and 0.95(+/-0.08) angstroms (all heavy atoms) for the best defined region of the protein (residues 3 to 49). The ensemble R-factor was 0.35, which indicates close correspondence with the experimental data. The structures revealed good stereochemical qualities. The conformations of the NMR structures of free and DNA complexed lac repressor headpiece were compared. The regions comprising the secondary structure elements show close correspondence for both conformations. However, the conformation of the loop between helix II and III changes considerably upon complexation of the headpiece. This change in the conformation of the loop in lac HP56 is essential for binding of the side-chains of residues Asn25 and His29 to the lac operator DNA. Finally, the lac headpiece residues that are intolerant to mutations were analysed. Most of these mutation-sensitive residues are important for a correct folding of the headpiece region, and a number of these residues are also involved in contacting the operator DNA.


    Related Citations: 
    • Two-Dimensional 1H-NMR Studies on the Lac Repressor DNA Binding Domain: Further Resonance Assignments and Identification of Nuclear Overhauser Enhancements
      Zuiderweg, E.R.,Scheek, R.M.,Kaptein, R.
      (1985) Biopolymers 24: 2257
    • Stereospecific Assignments of 1H-NMR Methyl Lines and Conformation of Valyl Residues in the Lac Repressor Headpiece
      Zuiderweg, E.R.P.,Boelens, R.,Kaptein, R.
      (1985) Biopolymers 24: 601
    • Backbone and Sidechain Dynamics of Lac Repressor Headpiece (1-56) and its Complex with DNA
      Slijper, M.,Boelens, R.,Davis, A.L.,Konings, R.N.H.,Van Der Marel, G.A.,Van Bloom, J.H.
      () TO BE PUBLISHED --: --
    • Sequence-Specific Resonance Assignments in the 1H Nuclear-Magnetic-Resonance Spectrum of the Lac Repressor DNA-Binding Domain 1-51 from Escherichia Coli by Two-Dimensional Spectroscopy
      Zuiderweg, E.R.,Kaptein, R.,Wuthrich, K.
      (1983) Eur.J.Biochem. 137: 279
    • Application of Structure Refinement Using 3D Noe-Noe Spectroscopy to Lac Repressor Headpiece (1-56)
      Slijper, M.,Bonvin, M.J.J.,Boelens, R.,Kaptein, R.
      (1995) J.Magn.Reson.,Ser.B 107: 298
    • Structure of the Complex of Lac Repressor Headpiece and an 11 Base-Pair Half-Operator Determined by Nuclear Magnetic Resonance Spectroscopy and Restrained Molecular Dynamics
      Chuprina, V.P.,Rullmann, J.A.,Lamerichs, R.M.,Van Boom, J.H.,Boelens, R.,Kaptein, R.
      (1993) J.Mol.Biol. 234: 446


    Organizational Affiliation

    Bijvoet Center for Biomolecular Research, Utrecht University, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LAC REPRESSOR
A
56Escherichia coli (strain K12)Gene Names: lacI
Find proteins for P03023 (Escherichia coli (strain K12))
Go to UniProtKB:  P03023
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 32 
  • Olderado: 1LQC Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-02-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance