Manganese- and Iron-Dependent Marine Methane Oxidation
Manganese- and Iron-Dependent Marine Methane Oxidation
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DOI：
10.1126/science.1169984
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发表时间：
2009-07-10
期刊：
影响因子：
56.9
通讯作者：
Orphan, Victoria J.
中科院分区：
文献类型：
--
作者：
Beal, Emily J.;House, Christopher H.;Orphan, Victoria J.
厌氧甲烷氧化菌有助于调节地球的气候，可能是早期地球微生物生态系统的重要组成部分。甲烷厌氧氧化（AOM）通常被认为是一个硫酸盐依赖的过程，尽管事实上，其他电子受体是更积极的有利。在这里，我们表明，微生物从海洋甲烷渗漏沉积物中的鳗鱼河流域在加州能够使用锰（水钠锰矿）和铁（水铁矿）氧化甲烷，揭示海洋AOM耦合，直接或间接，以更大的各种氧化剂比以前认为的。大量的锰和铁从河流提供给海洋，这表明锰和铁依赖的AOM具有全球重要性的潜力。
Anaerobic methanotrophs help regulate Earth's climate and may have been an important part of the microbial ecosystem on the early Earth. The anaerobic oxidation of methane (AOM) is often thought of as a sulfate-dependent process, despite the fact that other electron acceptors are more energetically favorable. Here, we show that microorganisms from marine methane-seep sediment in the Eel River Basin in California are capable of using manganese (birnessite) and iron (ferrihydrite) to oxidize methane, revealing that marine AOM is coupled, either directly or indirectly, to a larger variety of oxidants than previously thought. Large amounts of manganese and iron are provided to oceans from rivers, indicating that manganese- and iron-dependent AOM have the potential to be globally important.