微量气体的氧化维持了热友考古在低于最佳温度的热友考古的能量需求
Pok Man Leung1, Rhys Grinter2, Eve Tudor-Matthew2
1Department of Microbiology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia. bob.leung@monash.edu.
Nature communications
|April 15, 2024
概括
一些古生物消耗大气中的和一氧化碳作为能量. 这种微量气体氧化支持它们的生存和利基扩张,特别是在不同的环境中.
科学领域:
- 微生物学 微生物学
- 生物地质化学生物地质化学
- 考古物 (Archaea) 是一种古老的物种.
背景情况:
- 空气细菌利用大气中的 (H) 和一氧化碳 (CO) 进行生长,影响全球生物地化学循环.
- 古代生物在微量气体氧化中的作用,特别是H2消耗,仍然在很大程度上未被探索.
- 了解古老的微量气体代谢对于微生物生态学和生物地化学循环至关重要.
研究的目的:
- 调查古生物是否可以利用大气中的H2和CO作为能量来源.
- 确定古生物体中微量气体氧化的生理和基因组基础.
- 评估微量气体氧化对古生物生存和分散的生态意义.
主要方法:
- 用于培养和气体消耗的测量热酸性古物,Acidianus brierleyi和Metallosphaera sedula.
- 基因组分析以确定编码参与H2和CO氧化酶的基因.
- 在不同的环境条件下进行酶活性测定和表达分析.
主要成果:
- 亚亚 (Acidianus brierleyi) 构成性地消耗H2和CO,在广泛的温度范围 (10-70°C) 中达到大气下水平.
- 在饥饿期间,H2和CO氧化增强了A. brierleyi的ATP产量,有助于持久性.
- 金属球座也表现出大气H2氧化能力.
- A. brierleyi 具有一个CO脱酶和四个[NiFe]-酶,与环境因素相关的差异表达.
结论:
- 微量气体氧化可能是Sulfolobales archaea.ea.中常见的特征.
- 这种新陈代谢能力可能会增强古生物的生存,并促进的扩张,包括在温带环境中分散.
- 古生物有助于微量气体的生态化学循环,扩大了我们对微生物在生态系统中的作用的理解.
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