从土壤中丰富的comammox和氧化酸的酸耐受性和代谢潜力Nitrospira
Yu Takahashi1, Hirotsugu Fujitani2,3, Itsuki Taniguchi4
1Department of Life Science and Medical Bioscience, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, 162-8480, Japan.
ISME communications
|October 15, 2025
概括
从酸性土壤中发现了耐酸的Nitrospira,包括comammox和酸盐氧化细菌. 这些微生物具有独特的基因组特征,如尿素载体,有助于它们在低pH环境中生存.
科学领域:
- 环境微生物学环境微生物学
- 土壤科学 土壤科学
- 基因组学就是基因组学.
背景情况:
- 化是土壤中关键的微生物过程,将氨转化为酸盐.
- 酸性土壤 (pH <5.5) 给微生物生活带来了挑战,但却有专门的化细菌.
- 在酸性环境中广泛存在的 *Nitrospira* 属,对酸性耐受机制的了解很少.
研究的目的:
- 从酸性土壤中丰富的耐酸 *Nitrospira* 菌株的生理和基因组学特征.
- 为了研究基因组特征,使Nitrospira能够在低pH条件下生存.
主要方法:
- 使用元基因组测序来重建高质量的基因组.
- 进行了生理测试,以评估低pH (pH <5.5) 的生存率.
- 遗传学分析被用来确定丰富菌株的进化关系.
主要成果:
- 重建了Nitrospira的两个封闭基因组:一个comammox细菌和一个酸盐氧化细菌 (NOB).
- 这两种缩*Nitrospira*菌株都在pH值<5.5.5的情况下显示出生存能力.
- 科马莫克斯 * 尼特洛斯皮拉 * 在遗传学上与酸性土壤中发现的相关,并且在氧胺氧化酶中保留了活性部位残留物.
- 康马莫克斯和NOB*Nitrospira*都含有被动性尿素转运体,这是耐酸细菌中常见的特征.
结论:
- 耐酸*Nitrospira* (comammox和NOB) 已成功从酸性土壤中进行丰富和特征化.
- 已识别的*Nitrospira*具有基因组适应,包括尿素载体,以耐酸.
- 保存的酶活性位表明现有的化抑制剂可能抑制氨氧化.
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