解读低温对生物膜发育的影响:c-di-GMP的隐藏作用
Yu-Ting Lin1, Yong-Chao Wang1, Yi-Mei Xue1
1School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; Tianjin Key Lab of Indoor Air Environmental Quality Control, Tianjin 300072, China.
The Science of the total environment
|April 11, 2024
概括
低温显著抑制了废水生物膜的形成,因为它降低了循环二元单酸 (c-di-GMP) 的水平. 添加精氨酸可以增加c-di-GMP,在寒冷条件下增强生物膜的形成.
科学领域:
- 环境微生物学环境微生物学
- 废水处理技术 废水处理技术
- 生物膜形成的动态
背景情况:
- 生物膜在生物过程中至关重要,但由于废水温度低,它们受到抑制.
- 温度影响生物膜发育的确切机制尚不清楚.
- 了解这种机制对于优化废水处理至关重要.
研究的目的:
- 阐明温度对废水生物膜发展的影响机制.
- 确定在低温下增强生物膜形成的策略.
- 调查循环二元元单酸盐 (c-di-GMP) 和细胞外聚合物质 (EPS) 在温度依赖的生物膜生长中的作用.
主要方法:
- 在不同温度下 (4°C,15°C,28°C) 对生物膜发育的比较分析.
- 量化细胞内c-di-GMP水平和细胞外聚合物质 (EPS) 含量.
- 微生物社区分析和功能基因丰度评估.
- 试验外源性精子胺添加剂以调节c-di-GMP水平.
主要成果:
- 与28°C相比,在较低的温度 (4°C和15°C) 中,生物膜的发育显著下降.
- 低温降低了c-di-GMP度,这与EPS含量和生物膜粘附有积极的相关性.
- 心理友好细菌 (例如,Sporosarcina) 在低温下得到促进,而用于c-di-GMP合成的功能基因减少.
- 外源性精胺添加增加了细胞内c-di-GMP,并减轻了低温对生物膜发育的抑制作用.
结论:
- 低温阻碍生物膜的发展,减少微生物活动和细胞间通信,影响EPS的产生和粘附.
- c-di-GMP信号通路是温度对生物膜形成影响的关键媒介.
- 外源性精氨酸提供了一种可行的策略,可以在寒冷条件下增强废水生物膜的发展,提高处理效率.
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