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• W4360992940 abstract "Optogenetics is a technique for establishing direct spatiotemporal control over molecular function within living cells using light. Light application induces conformational changes within targeted proteins that produce changes in function. One of the applications of optogenetic tools is an allosteric control of proteins via light-sensing domain (LOV2), which allows direct and robust control of protein function. Computational studies supported by cellular imaging demonstrated that application of light allosterically inhibited signaling proteins Vav2, ITSN, and Rac1, but the structural and dynamic basis of such control has yet to be elucidated by experiment. Here, using NMR spectroscopy, we discover principles of action of allosteric control of cell division control protein 42 (CDC42), a small GTPase involved in cell signaling. Both LOV2 and Cdc42 employ flexibility in their function to switch between dark/lit or active/inactive states, respectively. By conjoining Cdc42 and phototropin1 LOV2 domains into the bi-switchable fusion Cdc42Lov, application of light-or alternatively, mutation in LOV2 to mimic light absorption-allosterically inhibits Cdc42 downstream signaling. The flow and patterning of allosteric transduction in this flexible system are well suited to observation by NMR. Close monitoring of the structural and dynamic properties of dark versus lit states of Cdc42Lov revealed lit-induced allosteric perturbations that extend to Cdc42's downstream effector binding site. Chemical shift perturbations for lit mimic, I539E, have distinct regions of sensitivity, and both the domains are coupled together, leading to bidirectional interdomain signaling. Insights gained from this optoallosteric design will increase our ability to control response sensitivity in future designs." @default.
• W4360992940 created "2023-03-30" @default.
• W4360992940 creator A5010573181 @default.
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• W4360992940 date "2023-03-27" @default.
• W4360992940 modified "2023-09-29" @default.
• W4360992940 title "Allosteric inactivation of an engineered optogenetic GTPase" @default.
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• W4360992940 doi "https://doi.org/10.1073/pnas.2219254120" @default.
• W4360992940 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36972433" @default.
• W4360992940 hasPublicationYear "2023" @default.
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