Karapetyan N V
Bach Institute of Biochemistry, Russian Academy of Sciences, 119071 Moscow, Russia.
Biochemistry (Mosc). 2007 Oct;72(10):1127-35. doi: 10.1134/s0006297907100100.
The pathways of energy dissipation of excessive absorbed energy in cyanobacteria in comparison with that in higher plants are discussed. Two mechanisms of non-photochemical quenching in cyanobacteria are described. In one case this quenching occurs as light-induced decrease of the fluorescence yield of long-wavelength chlorophylls of the photosystem I trimers induced by inactive reaction centers: P700 cation-radical or P700 in triplet state. In the other case, non-photochemical quenching in cyanobacteria takes place with contribution of water-soluble protein OCP (containing 3 -hydroxyechinenone) that induces reversible quenching of allophycocyanin fluorescence in phycobilisomes. The possible evolutionary pathways of the involvement of carotenoid-binding proteins in non-photochemical quenching are discussed comparing the cyanobacterial OCP and plant PsbS protein.
本文讨论了蓝藻中过量吸收能量的耗散途径，并与高等植物中的情况进行了比较。文中描述了蓝藻中两种非光化学猝灭机制。一种情况是，这种猝灭表现为非活性反应中心（三线态的P700阳离子自由基或P700）诱导的光系统I三聚体长波长叶绿素荧光产率的光诱导降低。另一种情况是，蓝藻中的非光化学猝灭是由水溶性蛋白OCP（含有3-羟基海胆酮）促成的，它能诱导藻胆体中别藻蓝蛋白荧光的可逆猝灭。通过比较蓝藻的OCP和植物的PsbS蛋白，讨论了类胡萝卜素结合蛋白参与非光化学猝灭的可能进化途径。
