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arXiv 2110.12232physics.chem-phastro-ph.GAphysics.bio-ph
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生命分子手性的起源

Origin of Chirality in the Molecules of Life

J. A. Cowan, R. J. Furnstahl

摘要:

分子手性是生物学和细胞化学所固有的。在这份报告中,对映体的选择性的起源进行了分析,从“RNA世界”模型的观点,基于自催化自我复制的甘油醛作为单糖的前体,特别是核糖,促进了formose反应。甲醛和乙醇醛的自催化偶联产生甘油醛,甘油醛含有在核糖环形成中携带的手性碳中心。宇称非守恒弱相互作用是自然界中唯一的固有手性性质,并且在本文中显示出足以区分在地质相关时间尺度上进行的自催化反应中的两种对映体形式,但仅在催化金属离子如二价钙或更高Z碱土元素存在下。这项工作详细计算了影响的大小,各种地质可用的金属离子的影响,以及对生命分子中手性演变和主导地位的影响。

英文摘要:

Molecular chirality is inherent to biology and cellular chemistry. In this report, the origin of enantiomeric selectivity is analyzed from the viewpoint of the "RNA World" model, based on the autocatalytic self-replication of glyceraldehyde as a precursor for simple sugars, and in particular ribose, as promoted by the formose reaction. Autocatalytic coupling of formaldehyde and glycolaldehyde produces glyceraldehyde, which contains a chiral carbon center that is carried through in formation of the ribose ring. The parity non-conserving weak interaction is the only inherently handed property in nature and is herein shown to be sufficient to differentiate between two enantiomeric forms in an autocatalytic reaction performed over geologically relevant time scales, but only in the presence of a catalytic metal ion such as divalent calcium or higher Z alkaline earth elements. This work details calculations of the magnitude of the effect, the impact of various geologically-available metal ions, and the influence on evolution and dominance of chirality in the molecules of life.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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