Metal Enzymes in 'Impossible' Microorganisms Catalyzing the Anaerobic Oxidation of Ammonium and Methane
| Autor: | Reimann, J., Jetten, M.S.M., Keltjens, J., Kroneck, P.M.H., Torres, M.E. Sosa |
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| Přispěvatelé: | Kroneck, P.M.H., Torres, M.E. Sosa |
| Rok vydání: | 2015 |
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| Zdroj: | Metal Ions in Life Sciences ; 15, 257-313. Berlin : Springer International Publishing STARTPAGE=257;ENDPAGE=313;TITLE=Metal Ions in Life Sciences ; 15 Kroneck, P.M.H.; Torres, M.E. Sosa (ed.), Sustaining Life on Planet Earth: Metalloenzymes Mastering Dioxygen and Other Chewy Gases, pp. 257-313 Sustaining Life on Planet Earth: Metalloenzymes Mastering Dioxygen and Other Chewy Gases ISBN: 9783319124148 |
| Popis: | Ammonium and methane are inert molecules and dedicated enzymes are required to break up the N-H and C-H bonds. Until recently, only aerobic microorganisms were known to grow by the oxidation of ammonium or methane. Apart from respiration, oxygen was specifically utilized to activate the inert substrates. The presumed obligatory need for oxygen may have resisted the search for microorganisms that are capable of the anaerobic oxidation of ammonium and of methane. However extremely slowly growing, these “impossible” organisms exist and they found other means to tackle ammonium and methane. Anaerobic ammonium-oxidizing (anammox) bacteria use the oxidative power of nitric oxide (NO) by forging this molecule to ammonium, thereby making hydrazine (N2H4). Nitrite-dependent anaerobic methane oxidizers (N-DAMO) again take advantage of NO, but now apparently disproportionating the compound into dinitrogen and dioxygen gas. This intracellularly produced dioxygen enables N-DAMO bacteria to adopt an aerobic mechanism for methane oxidation. |
| Databáze: | OpenAIRE |
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