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Water-mediated contacts in the trp-repressor operator complex recognition process.

Fajar R Wibowo1, Christine Rauch, Michael Trieb

  • 1Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria.

Biopolymers
|March 30, 2004
PubMed
Summary
This summary is machine-generated.

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Water molecules are crucial for trp-repressor operator recognition, forming stable DNA-protein contacts. Simulations reveal water

Area of Science:

  • Structural Biology
  • Computational Biophysics
  • Molecular Recognition

Background:

  • Water-mediated contacts are key in molecular recognition, particularly in trp-repressor operator systems.
  • Specific conserved base pairs (G(6).C(-6), A(5).T(-5)) and amino acids (Lys 72, Ile 79, Ala 80) are involved in these interactions.

Purpose of the Study:

  • To investigate the role and nature of water-mediated contacts in the trp-repressor operator complex.
  • To analyze the structural dynamics and stability of these interactions using molecular dynamics simulations.

Main Methods:

  • Analysis of the X-ray structure (PDB code: 1TRO) of the trp-repressor operator complex.
  • Performed two 10 ns molecular dynamics simulations from different starting dimer structures.
  • Examined water molecule behavior, residence times, and DNA-protein contact stability.

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Main Results:

  • Simulations showed an increase in water molecules in the major groove on one side of the dimer.
  • Despite increased solvent, water molecules maintained important DNA-protein contacts with stable distances.
  • Observed extension of water binding sites and B(II) substate interconversion in G6 phosphate, consistent with mutation data.

Conclusions:

  • Water-mediated contacts are essential for trp-repressor operator recognition and complex stability.
  • The observed structural rearrangements, including water dynamics and base modifications, highlight the dynamic nature of this recognition process.
  • A decrease in protein-DNA backbone hydrogen bonds may indicate an intermediate step in complex dissociation or association.