A fresh look at the evolution and diversification of photochemical reaction centers.
A fresh look at the evolution and diversification of photochemical reaction centers.
复制标题
DOI：
10.1007/s11120-014-0065-x
复制
发表时间：
2015-10
影响因子：
3.7
通讯作者：
Cardona T
中科院分区：
文献类型：
--
作者：
Cardona T
在这篇综述中，我重新审视的起源和多样化的光化学反应中心的核心亚基的系统发育关系的基础上，并与援助的序列和结构比对。例如，我证明了光系统II的D1和D2亚基C末端的蛋白质折叠（对于水氧化复合物的协调至关重要）已经在最古老的II型反应中心亚基中就位。然后，我评估的背景下，不同群体的细菌的崛起和扩张的反应中心的演变最近的大规模系统发育分析的基础上。我发现厚壁菌门的太阳杆菌科似乎是已知的光合细菌类群中最早的分支;然而，光化学反应中心和叶绿素合成的起源不能放在这个组中。此外，很明显，酸细菌和变形菌有一个更近的共同的光合祖先，这也可能是绿球藻和蓝藻。最后，我认为，最好的解释，如果这两种类型的光化学反应中心的进化之前，已知的光养细菌门的多样化的反应中心的蛋白质，叶绿素合成酶，和细菌的物种树之间的arcogenies的差异。原始的光养祖先必须同时具有I型和II型反应中心。
In this review, I reexamine the origin and diversification of photochemical reaction centers based on the known phylogenetic relations of the core subunits, and with the aid of sequence and structural alignments. I show, for example, that the protein folds at the C-terminus of the D1 and D2 subunits of Photosystem II, which are essential for the coordination of the water-oxidizing complex, were already in place in the most ancestral Type II reaction center subunit. I then evaluate the evolution of reaction centers in the context of the rise and expansion of the different groups of bacteria based on recent large-scale phylogenetic analyses. I find that the Heliobacteriaceae family of Firmicutes appears to be the earliest branching of the known groups of phototrophic bacteria; however, the origin of photochemical reaction centers and chlorophyll synthesis cannot be placed in this group. Moreover, it becomes evident that the Acidobacteria and the Proteobacteria shared a more recent common phototrophic ancestor, and this is also likely for the Chloroflexi and the Cyanobacteria. Finally, I argue that the discrepancies among the phylogenies of the reaction center proteins, chlorophyll synthesis enzymes, and the species tree of bacteria are best explained if both types of photochemical reaction centers evolved before the diversification of the known phyla of phototrophic bacteria. The primordial phototrophic ancestor must have had both Type I and Type II reaction centers.