Cadoret Jean-Charles, Demoulière Raphaël, Lavaud Johann, van Gorkom Hans J, Houmard Jean, Etienne Anne-Lise
Organismes Photosynthétiques et Environnement, FRE 2433 CNRS, Département de Biologie, ENS, 46 rue d'Ulm, 75230 Paris cedex 05, France.
Biochim Biophys Acta. 2004 Nov 4;1659(1):100-4. doi: 10.1016/j.bbabio.2004.08.001.
The chlorophyll-protein CP43' (isiA gene) induced by stress conditions in cyanobacteria is shown to serve as an antenna for Photosystem II (PSII), in addition to its known role as an antenna for Photosystem I (PSI). At high light intensity, this antenna is converted to an efficient trap for chlorophyll excitations that protects system II from photo-inhibition. In contrast to the 'energy-dependent non-photochemical quenching' (NPQ) in chloroplasts, this photoprotective energy dissipation in cyanobacteria is triggered by blue light. The induction is proportional to light intensity. Induction and decay of the quenching exhibit the same large temperature-dependence.
蓝细菌在应激条件下诱导产生的叶绿素蛋白CP43'（isiA基因），除了作为光系统I（PSI）的天线发挥其已知作用外，还被证明可作为光系统II（PSII）的天线。在高光强度下，该天线会转变为叶绿素激发的高效陷阱，保护光系统II免受光抑制。与叶绿体中的“能量依赖型非光化学猝灭”（NPQ）不同，蓝细菌中的这种光保护能量耗散是由蓝光触发的。其诱导与光强度成正比。猝灭的诱导和衰减表现出相同的强温度依赖性。
