Anoxic photochemical oxidation of siderite generates molecular hydrogen and iron oxides

Kim, J. Dongun; Yee, Nathan; Nanda, Vikas; Falkowski, Paul G.

doi:10.1073/pnas.1308958110

Cited by 47 publications

(44 citation statements)

References 39 publications

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“…3). In Archean oceans, H 2 was undoubtedly a major source of reducing power (17,18,39,40). Metabolic strategies among ancient microbial consortia (Fig.…”

Section: Does the Largest Subnetwork Contain Components Of Metabolicmentioning

confidence: 99%

Evolutionary history of redox metal-binding domains across the tree of life

Harel

Bromberg²,

Falkowski

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Oxidoreductases mediate electron transfer (i.e., redox) reactions across the tree of life and ultimately facilitate the biologically driven fluxes of hydrogen, carbon, nitrogen, oxygen, and sulfur on Earth. The core enzymes responsible for these reactions are ancient, often small in size, and highly diverse in amino acid sequence, and many require specific transition metals in their active sites. Here we reconstruct the evolution of metal-binding domains in extant oxidoreductases using a flexible network approach and permissive profile alignments based on available microbial genome data. Our results suggest there were at least 10 independent origins of redox domain families. However, we also identified multiple ancient connections between Fe 2 S 2 -(adrenodoxin-like) and heme-(cytochrome c) binding domains. Our results suggest that these two iron-containing redox families had a single common ancestor that underwent duplication and divergence. The iron-containing protein family constitutes ∼50% of all metal-containing oxidoreductases and potentially catalyzed redox reactions in the Archean oceans. Heme-binding domains seem to be derived via modular evolutionary processes that ultimately form the backbone of redox reactions in both anaerobic and aerobic respiration and photosynthesis. The empirically discovered network allows us to peer into the ancient history of microbial metabolism on our planet.iron-sulfur | Great Oxidation/Oxygenation Event | biogeochemical cycles | core pathways

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“…3). In Archean oceans, H 2 was undoubtedly a major source of reducing power (17,18,39,40). Metabolic strategies among ancient microbial consortia (Fig.…”

Section: Does the Largest Subnetwork Contain Components Of Metabolicmentioning

confidence: 99%

Evolutionary history of redox metal-binding domains across the tree of life

Harel

Bromberg²,

Falkowski

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…Most researchers discuss Fe II photo-oxidation (Cairns-Smith 1978, and the later work of Braterman et al 1983;Borowska and Mauzerall 1986;Lundgreen et al 1989;Kim et al 2013). Short wave-length UV-C light (maximum at 267 nm; Kim et al 2013) in controlled laboratory experiments created Fe II photo-oxidation, as opposed to Fe III photo-reduction, which is induced by light over a wider range of wavelengths (200 to 450 nm, maximum at 300 nm, David and David 1976). In the absence of a protective ozone layer in the upper atmosphere, UV-C radiation could have easily penetrated Mars' thin atmosphere, as it presumably did the atmosphere of early Earth.…”

Section: Comparison Between Mineralogical Features Of Copahue-caviahumentioning

confidence: 99%

Acid Rivers and Lakes at Caviahue-Copahue Volcano as Potential Terrestrial Analogues for Aqueous Paleo-Environments on Mars

Aguilar

Varekamp

Bergen

et al. 2015

Active Volcanoes of the World

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Mars carries primary rock with patchy occurrences of sulfates and sheet silicates. Both Mg-and Fe-sulfates have been documented, the former being rather uncommon on Earth. To what extent can a natural acidic river system on Earth be a terrestrial analog for early Mars environments? Copahue volcano (Argentina) has an active acid hydrothermal system that has precipitated a suite of minerals in its hydrothermal reservoir (silica, anhydrite, alunite, jarosite). Leakage from this subterranean system through hot springs and into the crater lake have formed a strongly acidified watershed (Río Agrio), which precipitates a host of minerals during cooling and dilution downstream. A suite of more than 100 minerals has been found and conditions for precipitation of the main phases are simulated with speciation/saturation routines. The lower part of the watershed (Lake Caviahue and the Lower Río Agrio) have abundant deposits of ferricrete since 2003: hydrous ferric oxides and schwertmannite occur, their precipitation being mediated by Fe-oxidizing bacteria and photochemical processes. Further downstream, at greater degrees of dilution, hydrous aluminum oxides and sulfates form and create 'alcretes' lining the river bed. The watershed carries among others jarosite, hematite, anhydrite, gypsum and silica minerals and the origin of all these minerals

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“…Much of the research on this type of metabolism has been conducted on mesophilic organisms; however, dissimilatory iron reduction is also an important terminal electron-accepting process in many geothermally heated ecosystems (3)(4)(5). Conditions in these hot environments are similar to those found on early Earth when Fe(III) was continuously being formed by photochemical oxidation of Fe(II) in archaean seas and from hydrothermal vent fluids (6)(7)(8). Therefore, any information regarding mechanisms involved in dissimilatory Fe(III) reduction by hyperthermophilic archaea isolated from these environments not only will shed light on present-day biogeochemical cycling patterns but also may provide information about what may have been occurring when life first appeared on the planet.…”

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confidence: 99%

Mechanisms Involved in Fe(III) Respiration by the Hyperthermophilic Archaeon Ferroglobus placidus

Smith

Aklujkar

Risso

et al. 2015

Appl Environ Microbiol

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The hyperthermophilic archaeon Ferroglobus placidus can utilize a wide variety of electron donors, including hydrocarbons and aromatic compounds, with Fe(III) serving as an electron acceptor. In Fe(III)-reducing bacteria that have been studied to date, this process is mediated by c-type cytochromes and type IV pili. However, there currently is little information available about how this process is accomplished in archaea. In silico analysis of the F. placidus genome revealed the presence of 30 genes coding for putative c-type cytochrome proteins (more than any other archaeon that has been sequenced to date), five of which contained 10 or more heme-binding motifs. When cell extracts were analyzed by SDS-PAGE followed by heme staining, multiple bands corresponding to c-type cytochromes were detected. Different protein expression patterns were observed in F. placidus cells grown on soluble and insoluble iron forms. In order to explore this result further, transcriptomic studies were performed. Eight genes corresponding to multiheme c-type cytochromes were upregulated when F. placidus was grown with insoluble Fe(III) oxide compared to soluble Fe(III) citrate as an electron acceptor. Numerous archaella (archaeal flagella) also were observed on Fe(III)-grown cells, and genes coding for two type IV pilin-like domain proteins were differentially expressed in Fe(III) oxidegrown cells. This study provides insight into the mechanisms for dissimilatory Fe(III) respiration by hyperthermophilic archaea.

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Anoxic photochemical oxidation of siderite generates molecular hydrogen and iron oxides

Cited by 47 publications

References 39 publications

Evolutionary history of redox metal-binding domains across the tree of life

Evolutionary history of redox metal-binding domains across the tree of life

Acid Rivers and Lakes at Caviahue-Copahue Volcano as Potential Terrestrial Analogues for Aqueous Paleo-Environments on Mars

Mechanisms Involved in Fe(III) Respiration by the Hyperthermophilic Archaeon Ferroglobus placidus

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