Crystal structure of the FRP and identification of the active site for modulation of OCP-mediated photoprotection in cyanobacteria.

ABSTRACT: Photosynthetic reaction centers are sensitive to high light conditions, which can cause damage because of the formation of reactive oxygen species. To prevent high-light induced damage, cyanobacteria have developed photoprotective mechanisms. One involves a photoactive carotenoid protein that decreases the transfer of excess energy to the reaction centers. This protein, the orange carotenoid protein (OCP), is present in most cyanobacterial strains; it is activated by high light conditions and able to dissipate excess energy at the site of the light-harvesting antennae, the phycobilisomes. Restoration of normal antenna capacity involves the fluorescence recovery protein (FRP). The FRP acts to dissociate the OCP from the phycobilisomes by accelerating the conversion of the active red OCP to

SUBMITTER: Sutter M 

PROVIDER: S-EPMC3683793 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature