Biogeochemical Implications of N2O-Reducing Thermophilic Campylobacteria in Deep-Sea Vent Fields, and the Description of Nitratiruptor labii sp. nov.
Biogeochemical Implications of N2O-Reducing Thermophilic Campylobacteria in Deep-Sea Vent Fields, and the Description of Nitratiruptor labii sp. nov.
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DOI：
10.1016/j.isci.2020.101462
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发表时间：
2020-09-25
期刊：
影响因子：
5.8
通讯作者：
Sawabe, Tomoo
中科院分区：
文献类型：
--
作者：
Fukushi, Muneyuki;Mino, Sayaka;Sawabe, Tomoo
一氧化二氮 (N2O) 是一种强效温室气体，在大气中的含量显着增加。深海热液场是由具有编码一氧化二氮还原酶的进化枝 II nosZ 的弯曲菌纲的嗜温至嗜热成员主导的典型环境。在这里，我们报道了一种菌株 HRV44(T)，它代表了第一种能够通过 H-2 氧化和 N2O 还原来生长的嗜热弯曲杆菌。根据生理和基因组特性，菌株 HRV44(T) (=JCM 34002 = DSM 111345) 被认为代表 Nitratiruptor 属的新种 Nitratiruptor labii sp。十一月将HRV44（T）菌株与其他Nitratiruptor和其他弯曲菌菌株的N2O消耗能力进行比较，发现菌株HRV44（T）的N2O消耗能力最高，表明N2O呼吸代谢可能是Nitratiruptor属的共同生理特征。我们的研究结果提供了关于嗜热弯曲菌对深海热液环境中 N2O 汇的贡献的见解。
Nitrous oxide (N2O) is a potent greenhouse gas and has significantly increased in the atmosphere. Deep-sea hydrothermal fields are representative environments dominated by mesophilic to thermophilic members of the class Campylobacteria that possess clade II nosZ encoding nitrous oxide reductase. Here, we report a strain HRV44(T) representing the first thermophilic campylobacterium capable of growth by H-2 oxidation coupled to N2O reduction. On the basis of physiological and genomic properties, it is proposed that strain HRV44(T) (=JCM 34002 = DSM 111345) represents a novel species of the genus Nitratiruptor, Nitratiruptor labii sp. nov. The comparison of the N2O consumption ability of strain HRV44(T) with those of additional Nitratiruptor and other campylobacterial strains revealed the highest level in strain HRV44(T) and suggests the N2O-respiring metabolism might be the common physiological trait for the genus Nitratiruptor. Our findings provide insights into contributions of thermophilic Campylobacteria to the N2O sink in deep-sea hydrothermal environments.