Optogenetic Modulation of Ion Channels by Photoreceptive Proteins
- PMID: 33398808
- DOI: 10.1007/978-981-15-8763-4_5
Optogenetic Modulation of Ion Channels by Photoreceptive Proteins
Abstract
In these 15 years, researches to control cellular responses by light have flourished dramatically to establish "optogenetics" as a research field. In particular, light-dependent excitation/inhibition of neural cells using channelrhodopsins or other microbial rhodopsins is the most powerful and the most widely used optogenetic technique. New channelrhodopsin-based optogenetic tools having favorable characteristics have been identified from a wide variety of organisms or created through mutagenesis. Despite the great efforts, some neuronal activities are still hard to be manipulated by the channelrhodopsin-based tools, indicating that complementary approaches are needed to make optogenetics more comprehensive. One of the feasible and complementary approaches is optical control of ion channels using photoreceptive proteins other than channelrhodopsins. In particular, animal opsins can modulate various ion channels via light-dependent G protein activation. In this chapter, we summarize how such alternative optogenetic tools work and they will be improved.
Keywords: G protein-coupled receptor; Ion channel; Membrane protein; Opsin; Optogenetics; Rhodopsin.
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