环状偏磷酸盐在生命起源中起作用吗?

IF 1.9 4区 物理与天体物理 Q2 BIOLOGY
Thomas Glonek
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引用次数: 8

摘要

生命是如何开始的仍然是科学生命的谜题,本文所介绍的初始祖先是原始无机和有机分子的化学集合体,能够自我复制并进化成越来越复杂的形式和功能。提出了一种假设,即由地质过程产生的含有聚合磷酸盐单元的矿物支架存在于原始海洋中,为原始生命成分的隔离和组织提供了启动因素。与先前提出磷酸盐是基本起始因子的假设不同,这里描述的关键磷酸盐不是多核苷酸或任何浓缩磷酸盐,而是一个大的(在至少1千磷酸亚基范围内),水溶性的环偏磷酸盐,这是一个仅含有磷酸中间基的聚合无机磷酸盐残基的闭环链。该链形成了一个固有的4-磷酸螺旋结构,类似于Na Kurrol盐中的结构,并且与DNA一样,非常大的偏磷酸盐可能折叠成发夹结构。利用类似于DNA的霍利德连接的混乱机制,环可以很容易地被操纵(增加、减少、交换),几乎不需要额外的能量,反应本质上是异构化。一篇文献综述描述了支持上述假设的发现。综述了浓缩磷酸盐无机化学,包括其地质起源,生物发生,酶及其通过真核生物的遗传学,多磷酸盐功能,环状多核苷酸和Holliday结的作用,以前的生物发生假说,以及太古宙时间轴。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Did Cyclic Metaphosphates Have a Role in the Origin of Life?

How life began still eludes science life, the initial progenote in the context presented herein, being a chemical aggregate of primordial inorganic and organic molecules capable of self-replication and evolution into ever increasingly complex forms and functions.Presented is a hypothesis that a mineral scaffold generated by geological processes and containing polymerized phosphate units was present in primordial seas that provided the initiating factor responsible for the sequestration and organization of primordial life's constituents. Unlike previous hypotheses proposing phosphates as the essential initiating factor, the key phosphate described here is not a polynucleotide or just any condensed phosphate but a large (in the range of at least 1 kilo-phosphate subunits), water soluble, cyclic metaphosphate, which is a closed loop chain of polymerized inorganic phosphate residues containing only phosphate middle groups. The chain forms an intrinsic 4-phosphate helix analogous to its structure in Na Kurrol's salt, and as with DNA, very large metaphosphates may fold into hairpin structures. Using a Holliday-junction-like scrambling mechanism, also analogous to DNA, rings may be manipulated (increased, decreased, exchanged) easily with little to no need for additional energy, the reaction being essentially an isomerization.A literature review is presented describing findings that support the above hypothesis. Reviewed is condensed phosphate inorganic chemistry including its geological origins, biological occurrence, enzymes and their genetics through eukaryotes, polyphosphate functions, circular polynucleotides and the role of the Holliday junction, previous biogenesis hypotheses, and an Eoarchean Era timeline.

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来源期刊
CiteScore
3.20
自引率
15.00%
发文量
12
审稿时长
>12 weeks
期刊介绍: The subject of the origin and early evolution of life is an inseparable part of the general discipline of Astrobiology. The journal Origins of Life and Evolution of Biospheres places special importance on the interconnection as well as the interdisciplinary nature of these fields, as is reflected in its subject coverage. While any scientific study which contributes to our understanding of the origins, evolution and distribution of life in the Universe is suitable for inclusion in the journal, some examples of important areas of interest are: prebiotic chemistry and the nature of Earth''s early environment, self-replicating and self-organizing systems, the theory of the RNA world and of other possible precursor systems, and the problem of the origin of the genetic code. Early evolution of life - as revealed by such techniques as the elucidation of biochemical pathways, molecular phylogeny, the study of Precambrian sediments and fossils and of major innovations in microbial evolution - forms a second focus. As a larger and more general context for these areas, Astrobiology refers to the origin and evolution of life in a cosmic setting, and includes interstellar chemistry, planetary atmospheres and habitable zones, the organic chemistry of comets, meteorites, asteroids and other small bodies, biological adaptation to extreme environments, life detection and related areas. Experimental papers, theoretical articles and authorative literature reviews are all appropriate forms for submission to the journal. In the coming years, Astrobiology will play an even greater role in defining the journal''s coverage and keeping Origins of Life and Evolution of Biospheres well-placed in this growing interdisciplinary field.
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