Acetylenotrophy: a hidden but ubiquitous microbial metabolism?

被引:18
作者
Akob, Denise M. [1 ]
Sutton, John M. [2 ]
Fierst, Janna L. [2 ]
Haase, Karl B. [1 ]
Baesman, Shaun [3 ]
Luther, George W., III [4 ]
Miller, Laurence G. [3 ]
Oremland, Ronald S. [3 ]
机构
[1] US Geol Survey, 12201 Sunrise Valley Dr,MS 430, Reston, VA 20192 USA
[2] Univ Alabama, Dept Biol Sci, SEC 2328,Box 870344, Tuscaloosa, AL 35487 USA
[3] US Geol Survey, 345 Middlefield Rd,MS 480, Menlo Pk, CA 94025 USA
[4] Univ Delaware, Sch Marine Sci & Policy, 700 Pilottown Rd,Cannon Lab 218, Lewes, DE 19958 USA
关键词
acetylene degraders; acetylenotrophs; acetylene; ethyne; NITROUS-OXIDE REDUCTION; STABLE CARBON-ISOTOPE; NONMETHANE HYDROCARBONS; PELOBACTER-ACETYLENICUS; ENZYMATIC UTILIZATION; LIGHT-HYDROCARBONS; VERTICAL PROFILES; PEM-WEST; ETHYLENE; METHANE;
D O I
10.1093/femsec/fiy103
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Acetylene (IUPAC name: ethyne) is a colorless, gaseous hydrocarbon, composed of two triple bonded carbon atoms attached to hydrogens (C2H2). When microbiologists and biogeochemists think of acetylene, they immediately think of its use as an inhibitory compound of certain microbial processes and a tracer for nitrogen fixation. However, what is less widely known is that anaerobic and aerobic microorganisms can degrade acetylene, using it as a sole carbon and energy source and providing the basis of a microbial food web. Here, we review what is known about acetylene degrading organisms and introduce the term 'acetylenotrophs' to refer to the microorganisms that carry out this metabolic pathway. In addition, we review the known environmental sources of acetylene and postulate the presence of an hidden acetylene cycle. The abundance of bacteria capable of using acetylene and other alkynes as an energy and carbon source suggests that there are energy cycles present in the environment that are driven by acetylene and alkyne production and consumption that are isolated from atmospheric exchange. Acetylenotrophs may have developed to leverage the relatively high concentrations of acetylene in the pre-Cambrian atmosphere, evolving later to survive in specialized niches where acetylene and other alkynes were produced.
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页数:14
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