Summary
This study engineered a mouse melanopsin variant (Y211F) with a blue-shifted action spectrum and twofold faster deactivation kinetics compared to wild-type melanopsin, using a hybrid computational-experimental approach. While primarily an optogenetics research tool, the findings deepen understanding of melanopsin's molecular switching mechanisms, which are relevant to how ipRGCs mediate non-visual light responses underlying circadian entrainment.
Key Findings
- Y211F melanopsin variant shows a narrow blue-shifted action spectrum compared to wild-type melanopsin.
- Y211F variant exhibits twofold faster deactivation kinetics on G protein-coupled inward rectifying K+ (GIRK) channels in HEK293 cells.
- In vivo optogenetic activity of the Y211F variant was verified in mice, confirming functional utility of the engineered variant.
Categories
The Science of Light: Investigates melanopsin photoreceptor biology, specifically engineering a melanopsin variant (Y211F) with altered spectral sensitivity and faster deactivation kinetics for optogenetic applications.
Author(s)
SA Tennigkeit, R Karapinar, T Rudack
Publication Year
2019
Number of Citations
8
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