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Related Experiment Videos

A directed approach for engineering conditional protein stability using biologically silent small molecules.

Lystranne A Maynard-Smith1, Ling-Chun Chen, Laura A Banaszynski

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

The Journal of Biological Chemistry
|July 3, 2007
PubMed
Summary
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Engineered protein stability can be controlled with cell-permeable molecules. However, protein mutations

Area of Science:

  • Biochemistry and Molecular Biology
  • Chemical Biology
  • Genetics

Background:

  • Controlling protein function with small molecules offers powerful biological insights.
  • A system was developed where protein stability depends on a high-affinity ligand, conferring ligand-dependent stability to fused proteins.
  • The FK506- and rapamycin-binding protein (FKBP12) is a well-characterized model for studying protein stability.

Purpose of the Study:

  • To assess if thermodynamic stabilities of FKBP12 mutants predict the engineering of ligand-dependent destabilizing domains.
  • To evaluate the correlation between in vitro protein stability and intracellular degradation rates.
  • To identify effective stabilizing ligands for FKBP12 mutants and assess their cellular effects.

Main Methods:

Related Experiment Videos

  • Thermodynamic stability measurements (DeltaDeltaG(U-F)) of FKBP12 mutants.
  • Assessment of intracellular degradation rates for FKBP12 mutants.
  • Screening of FKBP12 ligands, including Shield-1, for stabilization efficacy.
  • Microarray analysis of NIH3T3 cells treated with Shield-1.

    • Main Results:

    • In vitro thermodynamic stability weakly correlated with intracellular degradation rates.
    • The destabilizing effect of mutations was context-dependent.
    • Shield-1 emerged as the most effective stabilizing ligand for FKBP12 mutants.
    • Shield-1 treatment did not induce significant cellular responses in microarray analysis.

    Conclusions:

    • Predicting ligand-dependent protein destabilization from thermodynamic stability is challenging.
    • The context-dependency of mutations highlights the complexity of protein engineering.
    • Shield-1 is a potent chemical tool for stabilizing FKBP12 mutants with minimal cellular impact.
    • This system provides a valuable platform for chemical genetic control of protein function.