代谢特征选择Bathyarchaeia在现代铁质湖地下沉积物中的代谢特征
Fátima Ruiz-Blas1, Alexander Bartholomäus1, Sizhong Yang1
1GFZ German Research Centre for Geosciences, Section Geomicrobiology, Telegrafenberg, 14473 Potsdam, Germany.
ISME communications
|December 11, 2024
概括
揭示了古代富含铁的海洋沉积物中的微生物群落. 浴菌在这些铁质条件下壮成长,将硫循环与发酵和碳固定相结合.
科学领域:
- 地质化学 地质化学
- 微生物学 微生物学
- 环境科学 环境科学
背景情况:
- 早期地球海洋的特点是铁质 (富含铁) 条件,硫酸盐含量有限.
- 了解生物地球化学循环,氧化还原过程和无氧,富铁,硫酸盐贫沉积物中的有机物重矿化是至关重要的,但有限.
- 图武提湖是这些古老环境的现代类比.
研究的目的:
- 为了研究Towuti湖中的微生物地下生物圈,一个铁质的类似物.
- 了解微生物的分类学和功能分布,以应对地化学梯度.
- 阐明特定微生物群体,特别是Bathyarchaeia在氧化还原过程和碳循环中的作用.
主要方法:
- 对沉积物孔水进行了全面的地化学分析.
- 直接细胞计数以评估微生物生物质.
- 超基因组测序以确定微生物群体的组成和功能潜力.
- 聚合元基因组获取基因组 (MGG) 数据以重建微生物基因组.
主要成果:
- 微生物细胞密度在电子受体枯竭区域以下呈指数级下降.
- 微生物组合从减少铁和硫酸盐的细菌转移到发酵性厌氧生物和甲基生物.
- 浴主要在硫酸盐减少区以下,并具有独特的代谢途径.
- 浴菌可以循环聚硫化物并通过伍德-Ljungdahl路径进行碳固定,即使没有甲基辅酶M减少酶.
- 芭提亚基亚似乎能够将硫氧化还原反应与使用电子分叉的发酵过程结合起来.
结论:
- 浴菌是铁性沉积物中的关键参与者,将硫循环与发酵和生成联系起来.
- 在Bathyarchaeia的Wood-Ljungdahl路径支持无氧环境中的碳固定.
- 硫酸盐降解-发酵过渡区的铁质条件代表了Bathyarchaeia的一个优势利基.
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