1CJG

NMR STRUCTURE OF LAC REPRESSOR HP62-DNA COMPLEX


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 14 
  • Conformers Submitted: 11 
  • Selection Criteria: SEE ARTICLE 

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This is version 1.4 of the entry. See complete history


Literature

The solution structure of Lac repressor headpiece 62 complexed to a symmetrical lac operator.

Spronk, C.A.Bonvin, A.M.Radha, P.K.Melacini, G.Boelens, R.Kaptein, R.

(1999) Structure 7: 1483-1492

  • DOI: https://doi.org/10.1016/s0969-2126(00)88339-2
  • Primary Citation of Related Structures:  
    1CJG

  • PubMed Abstract: 

    Lactose repressor protein (Lac) controls the expression of the lactose metabolic genes in Escherichia coli by binding to an operator sequence in the promoter of the lac operon. Binding of inducer molecules to the Lac core domain induces changes in tertiary structure that are propagated to the DNA-binding domain through the connecting hinge region, thereby reducing the affinity for the operator. Protein-protein and protein-DNA interactions involving the hinge region play a crucial role in the allosteric changes occurring upon induction, but have not, as yet, been analyzed in atomic detail. We have used nuclear magnetic resonance (NMR) spectroscopy and restrained molecular dynamics (rMD) to determine the structure of the Lac repressor DNA-binding domain (headpeice 62; HP62) in complex with a symmetrized lac operator. Analysis of the structures reveals specific interactions between Lac repressor and DNA that were not found in previously investigated Lac repressor-DNA complexes. Important differences with the previously reported structures of the HP56-DNA complex were found in the loop following the helix-turn-helix (HTH) motif. The protein-protein and protein-DNA interactions involving the hinge region and the deformations in the DNA structure could be delineated in atomic detail. The structures were also used for comparison with the available crystallographic data on the Lac and Pur repressor-DNA complexes. The structures of the HP62-DNA complex provide the basis for a better understanding of the specific recognition in the Lac repressor-operator complex. In addition, the structural features of the hinge region provide detailed insight into the protein-protein and protein-DNA interactions responsible for the high affinity of the repressor for operator DNA.


  • Organizational Affiliation

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


Macromolecules

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (LAC REPRESSOR)C [auth A],
D [auth B]
62Escherichia coliMutation(s): 0 
Gene Names: LAC ITHE PART ENCODING THE 62 N-TERMINAL AMINOACIDS
UniProt
Find proteins for P03023 (Escherichia coli (strain K12))
Explore P03023 
Go to UniProtKB:  P03023
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03023
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 14 
  • Conformers Submitted: 11 
  • Selection Criteria: SEE ARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-01-01
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-11-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references