Pigment 750 sensitized photo oxidations in anacystis nidulans
Plant and Cell Physiology 19(8): 1457-1464
ISSN/ISBN: 0032-0781 Accession: 006122071
Endogenous reductants in Anacystis are photooxidized in a P750-sensitized reaction. These reductants do not serve as electron donors to photosystem I, nor are they oxidized in simpler chlorophyll-sensitized reactions. There are indications that excitation of both P750 and chlorophyll causes formation of singlet oxygen, but that chlorophyll-sensitized oxidations via the 1O2 mechanism are inhibited in Anacystis by the quenching effect of .beta.-carotene.