Activating proteins with light: A photocaged tyrosine was genetically encoded in E. coli in response to the amber codon TAG. Substitution of Tyr 503 in the active site of β-galactosidase allowed photoactivation of this enzyme in vitro or directly in bacteria with 360-nm light. This method should allow photoregulation of the activity of a variety of biological processes including transcription, signal transduction, and cellular trafficking.
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Deiters et al. (2006) studied this question.
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