产甲烷
古细菌
广域古菌界
甲烷厌氧氧化
基因组
格式化
生物
甲烷
硫酸盐还原菌
氢化酶
甲烷微生物
环境化学
甲烷八叠球菌
细菌
化学
生态学
生物化学
遗传学
基因
催化作用
作者
Zhen Yan,Kaifeng Du,Yulong Yan,Rui Huang,Fanping Zhu,Xian-Zheng Yuan,Shuguang Wang,James G. Ferry
标识
DOI:10.1073/pnas.2303179120
摘要
Anaerobic marine environments are the third largest producer of the greenhouse gas methane. The release to the atmosphere is prevented by anaerobic ‘methanotrophic archaea (ANME) dependent on a symbiotic association with sulfate-reducing bacteria or direct reduction of metal oxides. Metagenomic analyses of ANME are consistent with a reverse methanogenesis pathway, although no wild-type isolates have been available for validation and biochemical investigation. Herein is reported the characterization of methanotrophic growth for the diverse marine methanogens Methanosarcina acetivorans C2A and Methanococcoides orientis sp. nov. Growth was dependent on reduction of either ferrihydrite or humic acids revealing a respiratory mode of energy conservation. Acetate and/or formate were end products. Reversal of the well-characterized methanogenic pathways is remarkably like the consensus pathways for uncultured ANME based on extensive metagenomic analyses.
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