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Physiology, Metabolism, and Fossilization of Hot-Spring Filamentous Microbial Mats
Univ Illinois, Carl R Woese Inst Genom Biol, 1206 W Gregory Dr, Urbana, IL 61801 USA.;China Univ Geosci, Sch Environm Studies, Wuhan, Hubei, Peoples R China..
Univ Illinois, Carl R Woese Inst Genom Biol, 1206 W Gregory Dr, Urbana, IL 61801 USA.;Univ Illinois, Dept Geol, Urbana, IL USA..
Montana State Univ, Dept Land Resources & Environm Sci, Bozeman, MT 59717 USA.;Montana State Univ, Thermal Biol Inst, Bozeman, MT 59717 USA..
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemi, Glykovetenskap.ORCID-id: 0000-0003-1877-4154
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2019 (Engelska)Ingår i: Astrobiology, ISSN 1531-1074, E-ISSN 1557-8070, Vol. 19, nr 12Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The evolutionarily ancient Aquificales bacterium Sulfurihydrogenibium spp. dominates filamentous microbial mat communities in shallow, fast-flowing, and dysoxic hot-spring drainage systems around the world. In the present study, field observations of these fettuccini-like microbial mats at Mammoth Hot Springs in Yellowstone National Park are integrated with geology, geochemistry, hydrology, microscopy, and multi-omic molecular biology analyses. Strategic sampling of living filamentous mats along with the hot-spring CaCO3 (travertine) in which they are actively being entombed and fossilized has permitted the first direct linkage of Sulfurihydrogenibium spp. physiology and metabolism with the formation of distinct travertine streamer microbial biomarkers. Results indicate that, during chemoautotrophy and CO2 carbon fixation, the 87-98% Sulfurihydrogenibium-dominated mats utilize chaperons to facilitate enzyme stability and function. High-abundance transcripts and proteins for type IV pili and extracellular polymeric substances (EPSs) are consistent with their strong mucus-rich filaments tens of centimeters long that withstand hydrodynamic shear as they become encrusted by more than 5mm of travertine per day. Their primary energy source is the oxidation of reduced sulfur (e.g., sulfide, sulfur, or thiosulfate) and the simultaneous uptake of extremely low concentrations of dissolved O-2 facilitated by bd-type cytochromes. The formation of elevated travertine ridges permits the Sulfurihydrogenibium-dominated mats to create a shallow platform from which to access low levels of dissolved oxygen at the virtual exclusion of other microorganisms. These ridged travertine streamer microbial biomarkers are well preserved and create a robust fossil record of microbial physiological and metabolic activities in modern and ancient hot-spring ecosystems.

Ort, förlag, år, upplaga, sidor
MARY ANN LIEBERT, INC , 2019. Vol. 19, nr 12
Nyckelord [en]
Filamentous microbial mats, Hot-spring, Travertine, Biomarkers, Sulfurihydrogenibium
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:kth:diva-252635DOI: 10.1089/ast.2018.1965ISI: 000466966000001PubMedID: 31038352Scopus ID: 2-s2.0-85076328703OAI: oai:DiVA.org:kth-252635DiVA, id: diva2:1321925
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QC 20190610. QC 20200109

Tillgänglig från: 2019-06-10 Skapad: 2019-06-10 Senast uppdaterad: 2020-01-13Bibliografiskt granskad

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Srivastava, VaibhavBulone, Vincent

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Srivastava, VaibhavBulone, VincentFields, Christopher J.
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