Summary
This study uses computational modeling to engineer blue-shifted melanopsin mutants that are activated by blue/green/yellow light but resistant to red light, enabling simultaneous optogenetic control and red-light imaging. While primarily a basic science tool development paper, findings advance understanding of melanopsin's spectral tuning, which has implications for how light of different wavelengths differentially activates ipRGC-mediated pathways relevant to circadian and non-visual light responses.
Key Findings
- Four blue-shifted melanopsin mutants were successfully engineered and expressed, all showing resistance to activation by red light while remaining activatable by yellow, green, and blue light.
- Blue-shifted mutants retained bistability, a key functional property of wild-type melanopsin, and were capable of driving localized PIP3 generation and cell migration upon subcellular optical activation in macrophage cells.
- Computational ARM (Automatic Rhodopsin Modeling) using QM/MM models was validated as a feasible approach for engineering opsins with desired spectral properties.
Categories
The Science of Light: This paper investigates melanopsin photoreceptor biology, specifically engineering blue-shifted melanopsin mutants with altered spectral sensitivity, directly relevant to understanding opsin biology and phototransduction mechanisms.
Author(s)
D Wijayaratna, F Sacchetta, L Pedraza Gonzalez
Publication Year
2023
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