Abstract
Photoactivated adenylyl cyclase (PAC) was first discovered to be a sensor for photoavoidance in the flagellate Euglena gracilis. PAC is a flavoprotein that catalyzes the production of cAMP upon illumination with blue light, which enables us to optogenetically manipulate intracellular cAMP levels in various biological systems. Recent progress in genome sequencing has revealed several related proteins in bacteria and ameboflagellates. Among them, the PACs from sulfur bacterium Beggiatoa sp. and cyanobacterium Oscillatoria acuminata have been well characterized, including their crystalline structure. Although there have not been many reported optogenetic applications of PACs so far, they have the potential to be used in various fields within bioscience.
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