在强酸性条件下通过Pseudomonas citronellolis菌株YN-21有效氧化氨:性能和机制
Yuran Yang1, Liuyi Chen2, Tuohong Liu1
1Chongqing Key Laboratory of Interface Process and Soil Health, College of Resources and Environment, Southwest University, Chongqing 400716, China.
Bioresource technology
|November 27, 2024
概括
这项研究揭示了Pseudomonas citronellolis菌株YN-21在酸性条件下有效地去除氨 (NH4+). 它利用抗酸机制和尿素作为氨氧化的替代源.
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:
- 氨氧化对于循环至关重要.
- 酸性条件通常会抑制氨氧化,因为质子化氨不适用于氨单氧化酶.
- 了解耐酸氨氧化细菌对环境应用至关重要.
研究的目的:
- 在酸性环境中研究异质氨氧化细菌 (HAOB) 的氨去除效率.
- 阐明HAOB使用的抗酸机制.
- 探索使用替代源在酸性条件下氧化氨的潜力.
主要方法:
- 鉴别和鉴定Pseudomonas citronellolis菌株YN-21.1. 的特征
- 在低pH值下测量氨去除速率.
- 对抗酸性机制的分析 (H+ 流出,消耗,性物质的产生).
- 转录组分析以确定基因表达模式.
主要成果:
- 在pH4.5.5下, Pseudomonas citronellolis菌株YN-21显示出高的氨去除效率 (12.7 mg/L/h).
- 抗酸机制,包括H+外流和性物质的产生,保持细胞内pH中立性.
- 观察到参与氨基酸代谢,碳水化合物代谢,ABC载体和代谢的基因的升级.
- 尿素水解提供了氨 (NH3) 作为在酸性条件下氧化氨的基质.
结论:
- Pseudomonas citronellolis 菌株 YN-21 在强酸性环境中具有有效的氨氧化机制.
- 细菌利用尿素作为替代源的能力提高了其适应酸性条件的能力.
- 这些发现为优化在酸性环境中的氨氧化过程提供了新的视角.
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