Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
Science. 2017 Mar 31;355(6332):1436-1440. doi: 10.1126/science.aal3794.
The origin of oxygenic photosynthesis in Cyanobacteria led to the rise of oxygen on Earth ~2.3 billion years ago, profoundly altering the course of evolution by facilitating the development of aerobic respiration and complex multicellular life. Here we report the genomes of 41 uncultured organisms related to the photosynthetic Cyanobacteria (class ), including members of the class and a new class of Cyanobacteria (class ) that is basal to the and All members of the and lack photosynthetic machinery, indicating that phototrophy was not an ancestral feature of the Cyanobacteria and that acquired the genes for photosynthesis relatively late in cyanobacterial evolution. We show that all three classes independently acquired aerobic respiratory complexes, supporting the hypothesis that aerobic respiration evolved after oxygenic photosynthesis.
蓝细菌中的产氧光合作用的起源导致了大约 23 亿年前地球上氧气的增加，通过促进需氧呼吸和复杂多细胞生命的发展，深刻地改变了进化的进程。在这里，我们报告了 41 种与光合作用蓝细菌（门）相关的未培养生物的基因组，包括门和一个新的蓝细菌类（门）的成员，该成员是门和门的基础。和的所有成员都缺乏光合作用的机制，这表明光合作用不是蓝细菌的原始特征，并且在蓝细菌进化过程中相对较晚才获得了光合作用的基因。我们表明，这三个门都独立地获得了需氧呼吸复合物，这支持了需氧呼吸是在产氧光合作用之后进化的假说。
