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Related Experiment Videos

Perturbation from a distance: mutations that alter LacI function through long-range effects.

Liskin Swint-Kruse1, Hongli Zhan, Bonnie M Fairbanks

  • 1W. M. Keck Center for Computational Biology, Rice University, 6100 South Main Street, Houston, Texas 77005, USA.

Biochemistry
|November 26, 2003
PubMed
Summary
This summary is machine-generated.

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Mutations in the LacI repressor's core pivot region alter inducer and DNA binding. These findings reveal long-range effects of single substitutions, offering insights into allosteric regulation and potential applications.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Allosteric regulation of ligand binding is crucial for LacI transcription control.
  • Targeted molecular dynamics (TMD) simulations revealed the structural importance of the core pivot region in LacI repressor function.
  • Phenotypic screens identified LacI mutations within the core pivot region with altered repressor behaviors.

Purpose of the Study:

  • To biochemically characterize LacI variants (L148F, S151P, P320A) in the core pivot region.
  • To investigate the role of the core pivot in repressor function and allosteric regulation.
  • To explore the linkage between the core pivot and DNA binding domains through double mutant analysis.

Main Methods:

  • Targeted molecular dynamics (TMD) simulations.

Related Experiment Videos

  • Biochemical characterization of LacI variants (L148F, S151P, P320A).
  • UV-difference spectroscopy and urea denaturation assays.
  • Analysis of a double mutant (Q60G/L148F).

    • Main Results:

    • L148F variant showed strengthened inducer binding but diminished operator DNA binding.
    • S151P variant exhibited increased operator DNA binding with decreased inducer binding.
    • P320A variant displayed tighter DNA binding with unaffected inducer binding.
    • The Q60G/L148F double mutant showed near wild-type DNA binding and enhanced inducer sensitivity.

    Conclusions:

    • Core pivot mutations significantly impact LacI repressor function through long-range allosteric effects.
    • The core pivot region plays a critical structural role in mediating allosteric control of ligand binding.
    • Engineered LacI variants like Q60G/L148F may offer improved properties for technological applications.