フィルムVerrucomicrobiaの非常に酸性細菌によるメタンの酸化
Peter F Dunfield1, Anton Yuryev, Pavel Senin
1GNS Science, Extremophile Research Group, Private Bag 2000, Taupo, New Zealand. p.dunfield@gns.cri.nz
Nature
|November 16, 2007
まとめ
科学者たちは,メタンを消費する新しい酸性細菌を発見し,気候変動の緩和における微生物の役割についての理解を広げました. この発見は,メタンを酸化するバクテリアの多様性が,これまで知られていたよりも大きいことを明らかにしています.
科学分野:
- 微生物学 微生物学とは
- 環境科学 環境科学
- バイオジオケミストリー バイオジオケミストリー
背景:
- エアロビックメタノトロフィックバクテリアは,大気中のメタン排出量を減らす重要なバイオフィルターです.
- 酸性環境は活性メタンサイクルを宿しているが,知られているメタノトロフはpH5.0以下では繁栄しない.
研究 の 目的:
- 酸性環境からの非常に酸性的なメタノトロフを特徴付ける.
- メタンを酸化するバクテリアの分類学的および遺伝的多様性を調査する.
主な方法:
- 酸性メタノトロフの分離と栽培.
- ゲノムシーケンシングと解析.
- メタンモノオキシゲネーゼ (pmoA) 遺伝子の系統遺伝分析.
主要な成果:
- pH2.0-2.5.5で繁栄する酸性メタノトロフの発見
- このバクテリアは,プロテオバクテリアではなく,Verrucomicrobia族に属しています.
- ゲノム解析により,新たなメチロトロフィック経路と,異なるpmoA遺伝子群が明らかになった.
結論:
- メタノトロフィーは,以前に理解されていたよりも,分類学的に,そして遺伝的に,より多様です.
- Verrucomicrobiaは,メタノトロフの古代の系統を表しています.
- 酸性環境は,特徴のないメタノトロフィック多様性を有しています.
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