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原文連結
論文資訊
- 類型：已發表論文
- 日期：2012-04-19
摘要
The fixation of CO2 into living matter sustains all life on Earth, and embeds the biosphere within geochemistry. The six known chemical pathways used by extant organisms for this function are recognized to have overlaps, but their 演化 is incompletely understood. Here we reconstruct the complete early 演化ary history of 生物 carbon-fixation, relating all modern pathways to a single ancestral form. We find that innovations in carbon-fixation were the foundation for most major early divergences in the tree of life. These findings are based on a novel method that fully integrates metabolic and 系統發育 constraints. Comparing gene-profiles across the metabolic cores of deep-branching organisms and requiring that they are capable of synthesizing all their biomass components leads to the surprising conclu
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