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像驼一样的Anammox细菌在遭受饥饿后改变表面颜色
Jingqi Sun1,2, Yiming Feng1,2, Ru Zheng1,2
1College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Environmental science & technology
|September 27, 2023
概括
在饥饿期间,由于囊蛋白降解产生硫化 (H2S),anammox细菌会变黑. 这种H2S与铁结合,形成硫化铁 (FeS2),这是对H2S毒性的自我保护机制.
科学领域:
- 微生物学 微生物学
- 环境科学 环境科学
- 生物化学 生物化学
背景情况:
- 细菌利用新陈代谢途径在长期饥饿期间生存.
- 在饥饿期间,细菌的色彩变化,特别是anammox群体的色彩变化尚未得到充分理解.
- 红色和黑色阿纳莫克斯联盟之间的细胞染色体c水平没有显著差异.
研究的目的:
- 为了研究饥饿期间在anammox细菌中颜色变化的机制.
- 为了确定代谢途径,负责 anammox 联盟的变黑.
- 了解铁和硫化合物在细菌生存和颜色变化中的作用.
主要方法:
- 在红色和黑色anammox联盟中对细胞染色体c含量的比较分析.
- 在饥饿条件下,对代谢途径的研究,重点是氨酸的降解.
- 在细菌中形成的铁硫化合物的识别和表征.
主要成果:
- 氨酸降解被确定为一个关键的代谢途径,导致黑色anammox联盟的硫化 (H2S) 生产.
- H2S与由富含铁的纳米颗粒和铁硫团组成的自由铁相结合,形成硫化铁 (FeS2).
- FeS2,主要是细胞外的,引起了变黑,并且可以通过空气化氧化,使联合体恢复到红色.
结论:
- 饥饿期间anammox联盟的变黑是由于FeS2通过囊降解和铁-硫集群转换而形成的.
- 二氧化的形成是对高H2S度的自我保护机制,并促进铁的储存.
- 这项研究阐明了新的细菌生存策略,并扩大了对菌代谢的知识.
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