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Modular engineering of thermoresponsive allosteric proteins.

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Researchers developed a new thermogenetics strategy using LOV2 domains to control protein activity. This method allows precise, temperature-dependent regulation of diverse proteins, including CRISPR-Cas systems, in living cells.

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Area of Science:

  • Molecular Biology
  • Synthetic Biology
  • Biotechnology

Background:

  • Thermogenetics offers noninvasive control of protein activity but is limited to transcriptional regulation and membrane recruitment.
  • Existing thermogenetic tools lack broad applicability across diverse protein functions and cellular systems.

Purpose of the Study:

  • To develop a generalizable strategy for engineering thermosensitive allosteric proteins.
  • To expand the applications of thermogenetics beyond current limitations.
  • To create a blueprint for temperature-dependent protein control.

Main Methods:

  • Engineered thermosensitive allosteric proteins by inserting optimized Avena sativa LOV2 domain variants.
  • Applied the strategy to various proteins in Escherichia coli and mammalian systems.
  • Incorporated a chemoreceptor domain as an alternative thermosensing module.

Main Results:

  • Generated potent, thermoswitchable chimeric proteins with tight temperature control (37-41°C) in E. coli.
  • Engineered CRISPR-Cas genome editors responsive to physiological temperature changes in mammalian cells.
  • Demonstrated that thermosensitivity is a common feature in receptor domains.

Conclusions:

  • The LOV2 domain insertion strategy provides a versatile platform for engineering thermosensitive proteins.
  • This approach significantly expands the toolkit for thermogenetics, enabling precise control over diverse protein functions.
  • The findings pave the way for novel applications in synthetic biology and biotechnology requiring spatiotemporal regulation.