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論文

Hydrogen-based metabolism as an ancestral trait in lineages sibling to the Cyanobacteria

Carnevali, P. B. M.*; Schulz, F.*; Castelle, C. J.*; Kantor, R. S.*; Shih, P. M.*; Sharon, I.*; Santini, J.*; Olm, M. R.*; 天野 由記; Thomas, B. C.*; et al.

Nature Communications (Internet), 10, p.463_1 - 463_15, 2019/01

 被引用回数:1 パーセンタイル:17.48(Multidisciplinary Sciences)

The metabolic platform in which microbial aerobic respiration evolved is tightly linked to the origins of Cyanobacteria (Oxyphotobacteria). Melainabacteria and Sericytochromatia, close phylogenetic neighbores to Oxyphotobacteria comprise both fermentative and aerobic representatives, or clades that are capablee of both. Here, we predict the metabolisms of Margulisbacteria from two distinct environments and Saganbacteria, and compare them to genomes of organisms from the related lineages. Melainabacteria BJ4A obtained from Mizunami site are potentially able to use O$$_{2}$$ and other terminal electron acceptors. The type C heme-copper oxygen reductase found in Melainabacteria BJ4A may be adapted to low O$$_{2}$$ levels, as expected for microaerophilic or anoxic environments such as the subsurface. Notably, Melainabacteria BJ4A seems to have a branched electron transport chain, with one branch leading to a cytochrome d ubiquinol oxidoreductase and the other one leading to the type C heme-copper oxygen reductase. Both these enzymes have high affinity for O$$_{2}$$, thus are adapted to low O$$_{2}$$ levels. These contemporary lineages have representatives with fermentative H$$_{2}$$-based metabolism, lineages capable of aerobic or anaerobic respiration, and lineages with both. Our findings support the idea that the ancestor of these lineages was an anaerobe in which fermentation and H$$_{2}$$ metabolism were central metabolic features.

論文

A New view of the tree of life

Hug, L. A.*; Baker, B. J.*; Anantharaman, K.*; Brown, C. T.*; Probst, A. J.*; Castelle, C. J.*; Butterfield, C. N.*; Hernsdorf, A. W.*; 天野 由記; 伊勢 孝太郎; et al.

Nature Microbiology (Internet), 1(5), p.16048_1 - 16048_6, 2016/05

 被引用回数:387 パーセンタイル:0.02(Microbiology)

生命の系統樹は生物学において最も重要な中心テーマの一つである。遺伝子調査によると、莫大な数のブランチの存在が示唆されているが、フルスケールに近い系統樹でさえわかりにくいのが現状である。本研究では、これまでに報告されてきた配列情報に加えて、新たに取得した未培養生物のゲノム情報を用いて、バクテリア,アーキア,真核生物を含む系統樹を更新した。系統樹の描写は、全体的な概容とそれぞれの主要な系統における多様性のスナップショットの両方について行った。その結果、バクテリアの多様化の優勢性が示され、培養されていない生物種の重要性とともに主要な放射構造においてそれらの生物種の重要な進化が集中している現象が強調された。

口頭

Sulfur and hydrogen metabolism linked to CO$$_{2}$$ fixation by abundant Nitrospirae in the deep subsurface

天野 由記; Anantharaman, K.*; Tomas, B. C.*; Olm, M.*; Burstein, D.*; Castelle, C. J.*; 別部 光里*; 宮川 和也; 岩月 輝希; 鈴木 庸平*; et al.

no journal, , 

The bacterial phylum Nitrospirae is phylogenetically diverse. There are relatively few isolated representatives available for laboratory study and the physiology, functions and distributions of these bacteria across environments remain largely unknown. To understand the ecological role of Nitrospirae in the deep subsurface, we analyzed metagenomically-derived near complete genomes from groundwaters associated with granite and sedimentary rock where Nitrospirae are very abundant. The bacteria are autotrophs that fix CO$$_{2}$$ via the Wood-Ljungdahl pathway and reductive TCA cycles. The genomes encode versatile energy-generating pathways that involve sulfate reduction, hydrogen oxidation and nitrite reduction. Phylogenetic analyses indicate that the organisms are most similar to the isolated magnetotactic bacterium, Candidatus Magnetobacterium bavaricum, with only 89-91% 16S rRNA gene sequence identity. These Nitrospirae bacteria appear to play critical ecosystem roles as primary producers and they are likely central to sulfur cycling in the deep subsurface.

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