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Related Experiment Video

Updated: Jun 9, 2025

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation

Published on: October 4, 2024

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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation.

Trisha Bansal1, Nicholas Lechinsky1, Andrei V Karginov2

  • 1Department of Pharmacology and Regenerative Medicine, University of Illinois at Chicago.

Journal of Visualized Experiments : Jove
|October 21, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new optogenetic tool, LightR, for precise control of enzyme activity using blue light. This method offers fast ON/OFF switching and minimal dark activity, enabling subcellular control of protein function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Optogenetics

Background:

  • Optogenetics enables precise control of cellular processes.
  • Existing optogenetic tools face challenges in multi-functionality, ON/OFF kinetics, and subcellular precision.
  • Allosteric control via light-sensitive domains offers a promising solution.

Purpose of the Study:

  • To develop a novel optogenetic tool for precise, allosteric control of enzyme activity.
  • To create a system with fast ON/OFF kinetics, low dark-state activity, and subcellular resolution.
  • To demonstrate the tool's applicability across different enzyme classes and in mammalian cells.

Main Methods:

  • Engineered the Light-regulated allosteric switch module (LightR) by linking two Vivid (VVD) photoreceptor domains.
  • Incorporated LightR into the catalytic domain of target proteins to create a light-sensitive clamp.
  • Utilized blue light (465 nm) to modulate enzyme activity through LightR-induced conformational changes.
  • Validated the system using Src tyrosine kinase as a model enzyme.

Main Results:

  • Demonstrated light-induced ON/OFF control of enzyme activity with rapid kinetics.
  • Achieved minimal enzyme activity in the dark state (low leakiness).
  • Showcased precise subcellular regulation of enzyme function in mammalian cells.
  • Confirmed LightR's applicability to different enzyme classes, including protein kinases.

Conclusions:

  • The LightR system provides a versatile and efficient optogenetic tool for precise spatiotemporal control of enzyme activity.
  • This method overcomes limitations of existing optogenetic approaches, enabling new research avenues in signaling pathways.
  • LightR facilitates mechanistic studies of enzyme function in various biological contexts and disease models.