Two unique cyanobacteria lead to a traceable approach of the first appearance of oxygenic photosynthesis
Two unique cyanobacteria lead to a traceable approach of the first appearance of oxygenic photosynthesis
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DOI：
10.1007/s11120-008-9311-4
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发表时间：
2008-08-01
影响因子：
3.7
通讯作者：
Tsuchiya, Tohru
中科院分区：
文献类型：
--
作者：
Mimuro, Mamoru;Tomo, Tatsuya;Tsuchiya, Tohru
从光化学/光物理反应体系来看，从缺氧光合细菌到富氧蓝藻的进化路线是不连续的。很难简单地描述这种转变过程，因为在两个细菌群之间没有公认的中间生物。由于其仍具有原始的特征，如类囊体膜的缺失，因此可能是一种适合于分析的模式生物。全基因组分析和生化及生物物理研究。紫罗兰属植物支持它是一种中间生物的假设。另一方面，物种分化是一个进化过程，可以由少量基因的变化驱动，通过监测这些基因，这个过程可能会提供更详细的公平信息。基因的比较研究，包括Acaryochloris marina MBIC 11017中的基因，提供了与物种分化相关的信息;特别是，获得了一种新的色素，叶绿素d和氨基酸序列的变化。在这里，基于这两个物种的实验证据，我们讨论了一些进化途径的外观和分化的蓝藻。
The evolutionary route from anoxygenic photosynthetic bacteria to oxygenic cyanobacteria is discontinuous in terms of photochemical/photophysical reaction systems. It is difficult to describe this transition process simply because there are no recognized intermediary organisms between the two bacterial groups. Gloeobacter violaceus PCC 7421 might be a model organism that is suitable for analysis because it still possesses primordial characteristics such as the absence of thylakoid membranes. Whole genome analysis and biochemical and biophysical surveys of G. violaceus have favored the hypothesis that it is an intermediary organism. On the other hand, species differentiation is an evolutionary process that could be driven by changes in a small number of genes, and this process might give fair information more in details by monitoring of those genes. Comparative studies of genes, including those in Acaryochloris marina MBIC 11017, have provided information relevant to species differentiation; in particular, the acquisition of a new pigment, chlorophyll d, and changes in amino acid sequences have been informative. Here, based on experimental evidence from these two species, we discuss some of the evolutionary pathways for the appearance and differentiation of cyanobacteria.