期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-07878-4
关键词
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资金
- Research Resettlement Fund for the new faculty of Seoul National University
- NASA Research Opportunities in Space and Earth Sciences [NNX14AO48G]
- JSPSKAKENHI [10751084]
- Gordon and Betty Moore Foundation [GBMF 3306]
- Ministry of Oceans and Fisheries, Korea [20170411]
Sulfur isotope fractionation resulting from microbial sulfate reduction (MSR) provides some of the earliest evidence of life, and secular variations in fractionation values reflect changes in biogeochemical cycles. Here we determine the sulfur isotope effect of the enzyme adenosine phosphosulfate reductase (Apr), which is present in all known organisms conducting MSR and catalyzes the first reductive step in the pathway and reinterpret the sedimentary sulfur isotope record over geological time. Small fractionations may be attributed to low sulfate concentrations and/or high respiration rates, whereas fractionations greater than that of Apr require a low chemical potential at that metabolic step. Since Archean sediments lack fractionation exceeding the Apr value of 20%c, they are indicative of sulfate reducers having had access to ample electron donors to drive their metabolisms. Large fractionations in postArchean sediments are congruent with a decline of favorable electron donors as aerobic and other high potential metabolic competitors evolved.
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