DOI: 10.1038/NGEO2978
论文题名: Microbial substrate preference dictated by energy demand rather than supply
作者: Amenabar M.J. ; Shock E.L. ; Roden E.E. ; Peters J.W. ; Boyd E.S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 8 起始页码: 577
结束页码: 581
语种: 英语
Scopus关键词: autotrophy
; biochemistry
; bioenergetics
; biomass
; cation
; electron
; growth
; hydrogen
; microbial activity
; microorganism
; redox potential
; substrate preference
; sulfur
; thermodynamics
; Acidianus
; Archaea
英文摘要: Growth substrates that maximize energy yield are widely thought to be utilized preferentially by microorganisms. However, observed distributions of microorganisms and their activities often deviate from predictions based solely on thermodynamic considerations of substrate energy supply. Here we present observations of the bioenergetics and growth yields of a metabolically flexible, thermophilic strain of the archaeon Acidianus when grown autotrophically on minimal medium with hydrogen (H2) or elemental sulfur (So) as an electron donor, and So or ferric iron (Fe3+) as an electron acceptor. Thermodynamic calculations indicate that So/Fe3+ and H2/Fe3+ yield three- and fourfold more energy per mole of electrons transferred, respectively, than the H2/So couple. However, biomass yields in Acidianus cultures provided with H2/So were eightfold greater than when provided So/Fe3+ or H2/Fe3+, indicating that the H2/So redox couple is preferred. Indeed, cells provided with all three growth substrates (H2, Fe3+ and So) grew preferentially by reduction of So with H2. We conclude that substrate preference is dictated by differences in the energy demand of electron transfer reactions in Acidianus when grown with different substrates, rather than substrate energy supply. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105731
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Microbiology and Immunology, Montana State University, Bozeman, MT, United States; School of Earth and Space Exploration, School of Molecular Sciences, Arizona State University, Tempe, AZ, United States; NASA Astrobiology Institute, Mountain View, CA, United States; Department of Geosciences, University of Wisconsin, Madison, WI, United States; Institute of Biological Chemistry, Washington State University, Pullman, WA, United States
Recommended Citation:
Amenabar M.J.,Shock E.L.,Roden E.E.,et al. Microbial substrate preference dictated by energy demand rather than supply[J]. Nature Geoscience,2017-01-01,10(8)