The light-induced conformational change of the LOV domain is rapid (< 0.5 milliseconds). The half time for return to the dark state can be adjusted using point mutations (in our hands from 1.7 to 496 seconds, Curr. Protoc. Cell Biol., 73: 21.10.1-14, 2016). Rapid return times are useful for precise kinetic control. Slower return times enable continuous activation with only a brief pulse of light every few minutes.
Dagliyan, O., Krokhotin, A., Ozkan-Dagliyan, I., Deiters, A., Der, C.J., Hahn, K.M. and Dokholyan, N.V. Computational design of chemogenetic and optogenetic split proteins. Nature Communications, 9(1): 4042, 2018. PMC6168510. online article | Free PMC article
~ Updated 04/12/21