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- W2000225304 abstract "Abstract A conception of the origin of multicellularity and respiration is presented. It is assumed that the evolution of aerobic life was a phased process. The most important milestones of the process were the appearance, at first, of aerotolerance factors (catalase, peroxidase, Superoxide dismutase), and later, of an aerobic-type energy system (respiratory chain). The consecutive steps of morphophysiological progress are associated with the origin of these enzymes and enzyme systems. The advent of catalase could have given rise to the phenomenon of multicellularity on the basis of complementation of the catalase containing (deprived of another, initial enzyme, essential for the survival of cells) and catalase non-containing (preserving this initial “wild” enzyme) cells. The presence of catalase in multicellular heterotrophic fermenters led to their acquisition of photosynthesizing symbionts—protoplastids (which did not have their own catalase). The occurrence of energetically or physiologically expedient reactions in aerotolerant organisms utilizing free oxygen, did not balance the global effects of photosynthesis (an excessive accumulation of organic matter and oxygen, and a shortage of carbon dioxide). An equilibrium between organic synthesis and destruction processes was restored in the biosphere after the emergence of phosphorylative respiration. The great resemblance of enzyme systems and phosphorylation mechanisms in photosynthesis and respiration suggests that the respiratory assemblies were not created by nature anew, but evolved by way of inversion of the photosynthesizing apparatus in a part of protoplastids which had lost their capacity for photosynthesis (because of the termination of the supply of the radiant energy). The complication of the symbiosis of heterotrophs and photosynthesizers by the rise of a “third element”—protomitochondria —opened up new opportunities, the use of which could have led to a great diversification of cellular forms and thus promoted evolutionary progress." @default.
- W2000225304 created "2016-06-24" @default.
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- W2000225304 date "1978-12-01" @default.
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- W2000225304 title "Free oxygen and evolutionary progress" @default.
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- W2000225304 doi "https://doi.org/10.1016/0022-5193(78)90357-0" @default.
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