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首页> 外文期刊>Journal of Experimental Botany >A survey of carbon fixation pathways through a quantitative lensTI A survey of carbon fixation pathways through a quantitative lens
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A survey of carbon fixation pathways through a quantitative lensTI A survey of carbon fixation pathways through a quantitative lens

机译:通过定量透镜对碳固定途径的调查TI通过定量透镜对碳固定途径的调查

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摘要

While the reductive pentose phosphate cycle is responsible for the fixation of most of the carbon in the biosphere, it has several natural substitutes. In fact, due to the characterization of three new carbon fixation pathways in the last decade, the diversity of known metabolic solutions for autotrophic growth has doubled. In this review, the different pathways are analysed and compared according to various criteria, trying to connect each of the different metabolic alternatives to suitable environments or metabolic goals. The different roles of carbon fixation are discussed; in addition to sustaining autotrophic growth it can also be used for energy conservation and as an electron sink for the recycling of reduced electron carriers. Our main focus in this review is on thermodynamic and kinetic aspects, including thermodynamically challenging reactions, the ATP requirement of each pathway, energetic constraints on carbon fixation, and factors that are expected to limit the rate of the pathways. Finally, possible metabolic structures of yet unknown carbon fixation pathways are suggested and discussed.
机译:虽然还原性戊糖磷酸循环负责生物圈中大部分碳的固定,但它有几种天然替代品。实际上,由于过去十年中三个新的碳固定途径的特征,用于自养生长的已知代谢溶液的多样性增加了一倍。在这篇综述中,根据各种标准对不同的途径进行了分析和比较,试图将每个不同的代谢替代方案与合适的环境或代谢目标联系起来。讨论了碳固定的不同作用。除了维持自养生长之外,它还可以用于节约能源,并用作回收还原的电子载流子的电子吸收器。我们在这篇综述中的主要重点是热力学和动力学方面,包括热力学挑战性反应,每个途径的ATP需求,对碳固定的能量约束以及预期限制途径速率的因素。最后,提出并讨论了碳固定途径未知的可能的代谢结构。

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