细胞外电子转移基因由候选群集细菌在电缆细菌沉积物中的候选细菌表达
Jamie J M Lustermans1,2,3, Mantas Sereika4, Laurine D W Burdorf1
1Center for Electromicrobiology, Department of Biology, Aarhus University, Aarhus, Denmark.
mSystems
|December 19, 2024
概括
多种细菌与淡水沉积物中的电缆细菌形成电关系,转移电子以促进更深层的氧气使用. 这种相互作用影响了硫,碳和金属循环.
科学领域:
- 微生物生态学 微生物生态学
- 地质微生物学的生物.
- 生物地质化学生物地质化学
背景情况:
- 电缆细菌是纤维状的,硫化物氧化微生物,在沉积物中发现.
- 它们与其他细菌相互作用,形成"群",可以促进细胞外电子转移.
- 这些在淡水沉积物中的集群细菌的身份和功能以前没有被研究过.
研究的目的:
- 在淡水沉积物中识别围绕电缆细菌聚集的细菌.
- 阐明它们的细胞外电子转移能力和代谢功能.
- 了解它们在沉积物生地化学循环中的作用.
主要方法:
- 在155天内将元基因组学和元转录组学与16S rRNA amplicon测序相结合.
- 根据运动性和细胞外电子转移基因 (phenazines,flavins) 识别候选集群细菌.
- 分析微生物社区结构,基因表达和代谢途径.
主要成果:
- 确定了22个MAG (21.4%的总量) 作为候选集群细菌.
- 42.1%的候选群体表达了细胞外电子转移基因.
- 集群细菌代表着9个类的多样化,代谢多样化的细菌群.
- 这些细菌参与无氧沉积层中的硫,碳和铁循环.
结论:
- 淡水沉积物中的电缆细菌与各种外电源微生物发生电关系.
- 这些相互作用使得在更深的无氧沉积层中间接利用氧气.
- 这扩大了对微生物新陈代谢和沉积物中的生物地球化学循环的理解.
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