Evolution of carbonaceous compounds in endogenic mineralization and the origin of life

Florovskaya, V. N.

doi:10.1080/00206817809471512

Cited by 4 publications

(2 citation statements)

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“…Formation of such vacancies is independent of the redox poise of the environment; it may have continuously proceeded in the vicinity of living organisms. Indeed, as long as solar light, in all likelihood, was involved in prebiotic synthesis and selection of first biopolymers (Mulkidjanian et al 2003, Powner et al 2009, Sutherland 2016, the first life is believed to form in the vicinity of terrestrial geothermal systems which could deliver building blocks, such as organic molecules, as well as phosphorous and nitrogen compounds (Florovskaya 1978, Deamer et al 2006, Ricardo and Szostak 2009, Mulkidjanian et al 2012, Sponer et al 2016, Sutherland 2016. Many mineral compounds deposited at the sites of geothermal activity, including the sulfides of zinc, manganese and cadmium, are photoactive (Schoonen et al 2004).…”

Section: Emergence Of Cyt Bc Complexes In the Context Of Photosynthesismentioning

confidence: 99%

Emergence of cytochrome bc complexes in the context of photosynthesis

Dibrova

Shalaeva

Galperin

2017

Physiologia Plantarum

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The cytochrome bc (cyt bc) complexes are involved in Q‐cycling; they oxidize membrane quinols by high‐potential electron acceptors, such as cytochromes or plastocyanin, and generate transmembrane proton gradient. In several prokaryotic lineages, and also in plant chloroplasts, the catalytic core of the cyt bc complexes is built of a four‐helical cytochrome b (cyt b) that contains three hemes, a three‐helical subunit IV, and an iron‐sulfur Rieske protein (cytochrome b 6 f‐type complexes). In other prokaryotic lineages, and also in mitochondria, the cyt b subunit is fused with subunit IV, yielding a seven‐ or eight‐helical cyt b with only two hemes (cyt bc 1‐type complexes). Here we present an updated phylogenomic analysis of the cyt b subunits of cyt bc complexes. This analysis provides further support to our earlier suggestion that (1) the ancestral version of cyt bc complex contained a small four‐helical cyt b with three hemes similar to the plant cytochrome b 6 and (2) independent fusion events led to the formation of large cyts b in several lineages. In the search for a primordial function for the ancestral cyt bc complex, we address the intimate connection between the cyt bc complexes and photosynthesis. Indeed, the Q‐cycle turnover in the cyt bc complexes demands high‐potential electron acceptors. Before the Great Oxygenation Event, the biosphere had been highly reduced, so high‐potential electron acceptors could only be generated upon light‐driven charge separation. It appears that an ancestral cyt bc complex capable of Q‐cycling has emerged in conjunction with the (bacterio)chlorophyll‐based photosynthetic systems that continuously generated electron vacancies at the oxidized (bacterio)chlorophyll molecules.

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Section: Emergence Of Cyt Bc Complexes In the Context Of Photosynthesismentioning

confidence: 99%

Emergence of cytochrome bc complexes in the context of photosynthesis

Dibrova

Shalaeva

Galperin

2017

Physiologia Plantarum

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“…An analysis of the physicochemical environ ment, which characterizes the release of min eral waters onto the surface containing molecules of biochemically important compounds formed during the process of evolution of a magmatic fluid, has been presented in a number of works (3,4,6,7). In the case of a hydrothermal solution rich in carbon dioxide and calcium, and as a result of the rapid loss of C02 and evapora tion of water, a mineral substance (travertine) is precipitated, forming crusts, through which water flows.…”

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confidence: 99%