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Updated: Aug 5, 2025

Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
Published on: October 4, 2024
Allosteric inactivation of an engineered optogenetic GTPase
Abha Jain1, Nikolay V Dokholyan2,3, Andrew L Lee1
1Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599.
Optogenetics uses light to control protein function. Researchers engineered a bi-switchable fusion protein, Cdc42Lov, demonstrating light-induced allosteric inhibition of Cdc42 signaling pathways via NMR spectroscopy.
Area of Science:
- Molecular Biology
- Biophysics
- Biochemistry
Background:
- Optogenetics enables precise control of molecular functions in cells using light.
- Light induces conformational changes in proteins, altering their function.
- The light-sensing domain 2 (LOV2) facilitates allosteric control of protein activity.
Purpose of the Study:
- To elucidate the structural and dynamic basis of optogenetic allosteric control.
- To investigate the allosteric control mechanism of cell division control protein 42 (CDC42) using optogenetics.
- To characterize the bi-switchable fusion protein Cdc42Lov.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to study protein dynamics and structure.
- A bi-switchable fusion protein, Cdc42Lov, was engineered by combining Cdc42 and phototropin1 LOV2 domains.
- Cellular imaging and computational studies informed the experimental design.
Main Results:
- Light application or LOV2 mutation allosterically inhibited Cdc42 downstream signaling in the Cdc42Lov fusion protein.
- NMR analysis revealed light-induced allosteric perturbations extending to the Cdc42 effector binding site.
- Bidirectional interdomain signaling was observed, indicating coupled dynamics between LOV2 and Cdc42 domains.
Conclusions:
- The study reveals the principles governing optoallosteric control in flexible biological systems.
- Engineered Cdc42Lov demonstrates effective light-mediated inhibition of signaling.
- This work provides insights for designing systems with tunable response sensitivity.
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