期刊
CURRENT OPINION IN CHEMICAL BIOLOGY
卷 31, 期 -, 页码 166-178出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cbpa.2016.03.013
关键词
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资金
- David and Lucile Packard Foundation Fellowship in Science and Engineering
- Agouron Institute
Life on Earth originated and evolved in anoxic environments. Around 2.4 billion-years-ago, ancestors of Cyanobacteria invented oxygenic photosynthesis, producing substantial amounts of O-2 as a byproduct of phototrophic water oxidation. The sudden appearance of O-2 would have led to significant oxidative stress due to incompatibilities with core cellular biochemical processes. Here we examine this problem through the lens of Cyanobacteria - the first taxa to observe significant fluxes of intracellular dioxygen. These early oxygenic organisms likely adapted to the oxidative stress by co-opting preexisting systems (exaptation) with fortuitous antioxidant properties. Over time more advanced antioxidant systems evolved, allowing Cyanobacteria to adapt to an aerobic lifestyle and become the most important environmental engineers in Earth history.
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