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Related Experiment Videos

Engineering temperature-sensitive SH3 domains.

M C Parrini1, B J Mayer

  • 1Division of Molecular Medicine, Children's Hospital, Department of Microbiology and Molecular Genetics, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.

Chemistry & Biology
|October 6, 1999
PubMed
Summary
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Researchers engineered temperature-sensitive Src homology 3 (SH3) domains to control protein interactions in cells. This novel method allows conditional regulation of signaling pathways by making protein binding temperature-dependent.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Protein Engineering

Background:

  • Protein-protein interactions are crucial for cellular signaling networks.
  • Src homology 3 (SH3) domains mediate these interactions by binding proline-rich sequences.
  • Conditional control of these interactions in vivo is essential for network analysis.

Purpose of the Study:

  • To develop a method for conditionally controlling protein-protein interactions in vivo.
  • To engineer temperature-sensitive SH3 domains for dissecting signaling pathways.
  • To establish a general strategy for creating temperature-sensitive protein interaction domains.

Main Methods:

  • Random in vitro mutagenesis of the Nck SH3 domain.
  • Yeast two-hybrid screening to identify temperature-sensitive mutants.

Related Experiment Videos

  • Functional validation of mutants in mammalian cells.
  • Mutagenesis of conserved residues in the hydrophobic core.

    • Main Results:

    • Identified mutations in the Nck SH3 domain conferring temperature sensitivity.
    • Mutant domains showed temperature-dependent instability and loss of function in mammalian cells.
    • Mutating conserved hydrophobic core residues (Val133, Val160) created temperature-sensitive SH3 domains.
    • Successfully engineered temperature-sensitive Crk-1 protein using this strategy.

    Conclusions:

    • Temperature-sensitive SH3 domains offer a novel way to regulate SH3 domain function in vivo.
    • These mutants are valuable tools for dissecting SH3-mediated signaling.
    • The methodology is broadly applicable to engineering temperature-sensitive protein interaction domains.