マンガンの酸化による細菌化学オートロフィー
Hang Yu1, Jared R Leadbetter2,3
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
Nature
|July 17, 2020
まとめ
研究者たちは 成長のために マンガンの酸化を利用する 微生物を発見し 重要な生地化学的サイクルを 完成させました 微生物のエネルギー代謝と地球に関する理解を広げています
科学分野:
- 微生物学
- 地化学
- 生地化学
背景:
- マンガンの酸化は微生物の成長をサポートすると理論化されたが,実験的な実証は欠けていた.
- ケモリトオートロフィックな微生物は エネルギーと炭素固定のために無機化合物を利用します
研究 の 目的:
- マンガネス (Mn(II)) 酸化による微生物の増殖を証明し,特徴づけること.
- 関連する微生物とその代謝経路を特定する.
主な方法:
- 濃縮培養物の精製により,Mn (II) 酸化共同培養物を分離する.
- 炭素固定を追跡するために,13CO2で安定同位体探査.
- 代謝経路の解明のための 転写解析
主要な成果:
- "Candidatus Manganitrophus noduliformans"と"Ramlibacter lithotrophicus"という2つの細菌の共同培養は,Mn ((II) 酸化に依存する指数関数的な成長を示した.
- Mn(II) の酸化により,バクテリア細胞に結合したマンガンの酸化ノードルが生成された.
- 安定同位体探査は,Mn ((II) 酸化に関連したバイオマスに13CO2の固定を確認した.
結論:
- この研究は,マンガンの酸化による微生物の成長の最初の実験的証拠を提供します.
- 発見は,無機代謝の既知の多様性を拡大し,マンガンの生地化学的サイクルを完了します.
- 特定された微生物の経路は,細胞外マンガンの酸化とエアロビックエネルギー保存とオートロフィックCO2固定を結びます.
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