De Las Rivas Javier, Balsera Mónica, Barber James
Instituto de Recursos Naturales y Agrobiologia, Consejo Superior de Investigaciones Cientificas (CSIC), Salamanca, Spain.
Trends Plant Sci. 2004 Jan;9(1):18-25. doi: 10.1016/j.tplants.2003.11.007.
The appearance of oxygenic photosynthesis was a key event in the evolution of our green biosphere. Oxygen in the atmosphere is generally believed to come from the biomolecular water-splitting reaction that occurs in oxyphotosynthetic organisms catalysed by the oxygen evolving centre (OEC) of Photosystem II. Using knowledge from complete genomes and current databases, we have investigated the nature and composition of the extrinsic proteins forming the OECs of different organisms, with particular focus on the manganese stabilizing protein that is present in all known oxyphototrophs. This analysis traces the evolution of the extrinsic proteins from ancient cyanobacteria to higher plants and gives hints about the ancestral form of the OEC.
氧光合作用的出现是我们绿色生物圈进化中的一个关键事件。大气中的氧气一般被认为来自光合放氧生物中由光系统II的放氧中心（OEC）催化的生物分子水裂解反应。利用来自完整基因组和当前数据库的知识，我们研究了构成不同生物体OEC的外在蛋白的性质和组成，特别关注所有已知光合放氧生物中都存在的锰稳定蛋白。该分析追溯了外在蛋白从古老蓝细菌到高等植物的进化过程，并给出了有关OEC原始形式的线索。
