无氧内共生体通过脱方式为状宿主产生能量
Jon S Graf1, Sina Schorn2, Katharina Kitzinger2,3
1Max Planck Institute for Marine Microbiology, Bremen, Germany. jgraf@mpi-bremen.de.
Nature
|March 4, 2021
概括
一种新发现的细菌,Candidatus Azoamicus ciliaticola,通过呼吸为其无氧的状宿主提供能量. 这种内生生物体展示了真核生物如何获得新的能量供应伙伴.
科学领域:
- 微生物学
- 细胞生物学
- 共生研究
背景情况:
- 线粒体起源于内共生细菌,是真核生物通过呼吸产生能量的关键.
- 有减少线粒体的无氧真核生物通常依赖发酵来获得能量.
- 线粒体的进化及其在真核生物适应多种环境中的作用是一个正在进行的研究领域.
研究的目的:
- 描述一种在无氧纤毛动物中发现的新型有义务内生生物"Candidatus Azoamicus ciliaticola".
- 研究这种内生体为其真核宿主提供能量的机制.
- 探索这种共生对真核生物进化和能量获取的影响.
主要方法:
- "Candidatus Azoamicus ciliaticola"的基因组测序
- 对内生生物的基因组进行生物信息分析以确定代谢途径.
- 与其他细菌和线粒体基因组对内生生物的基因组进行比较分析.
主要成果:
- "Candidatus Azoamicus ciliaticola"具有高度缩小的基因组 (0.29-Mb),具有对能量代谢至关重要的基因.
- 这种内生生物利用脱通道进行呼吸,使宿主能够使用酸盐代替氧气.
- 这种共生是由ATP从内共生体转移到宿主而不是营养交换的特征.
结论:
- "Candidatus Azoamicus ciliaticola"是一种有义务的内生生物,通过呼吸为其无氧的状宿主提供能量.
- 这一发现突显出一种基于能量转移 (ATP) 的新形式的共生.
- 这表明,具有减少线粒体的真核生物可能会获得新的提供能量的内生体,扩大我们对真核生物进化的理解.
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