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Optimized second-generation CRY2-CIB dimerizers and photoactivatable Cre recombinase.

Nat. Chem. Biol.2016 Jun;12(6):425-30. Epub 2016 Apr 11
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摘要


Arabidopsis thaliana cryptochrome 2 (AtCRY2), a light-sensitive photosensory protein, was previously adapted for use in controlling protein-protein interactions through light-dependent binding to a partner protein, CIB1. While the existing CRY2-CIB dimerization system has been used extensively for optogenetic applications, some limitations exist. Here, we set out to optimize function of the CRY2-CIB system by identifying versions of CRY2-CIB that are smaller, show reduced dark interaction, and maintain longer or shorter signaling states in response to a pulse of light. We describe minimal functional CRY2 and CIB1 domains maintaining light-dependent interaction and new signaling mutations affecting AtCRY2 photocycle kinetics. The latter work implicates an α13-α14 turn motif within plant CRYs whose perturbation alters signaling-state lifetime. Using a long-lived L348F photocycle mutant, we engineered a second-generation photoactivatable Cre recombinase, PA-Cre2.0, that shows five-fold improved dynamic range, allowing robust recombination following exposure to a single, brief pulse of light.

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