广泛的散乱的性酸酶强调了古老的微生物酸盐利用
Morito Sakuma1, Naoki Konno2,3, Sevan Gholipour1
1Michael Smith Laboratories, Faculty of Science, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
概括
细菌使用性酸酶 (PhoA) 将酸盐 (Pt) 氧化为酸盐,解决酸盐稀缺问题. 这种被忽视的PhoA功能在细菌中很普遍,对循环至关重要.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 环境科学 环境科学
背景情况:
- 酸盐是一种重要的营养素,通常很稀缺,限制了细菌生长和生物分子的产生.
- 细菌拥有酶,可以利用酸盐 (Pt) 等替代源来克服酸盐的限制.
- 酸盐氧化中的特定酶和微生物作用及其对循环的影响尚未完全理解.
研究的目的:
- 为了识别和描述与酸盐 (Pt) 氧化有关的细菌酶.
- 研究Pt-氧化酶,特别是性酸酶 (PhoA) 的进化史和功能性乱交.
- 阐明微生物Pt氧化在细菌酸盐代谢和全球循环中的作用.
主要方法:
- 对Pt-氧化酶的生物信息分析,包括酸脱酶 (PtxD) 和酸酶 (PhoA).
- 在细菌系中对PhoA和PtxD分布的比较进化分析.
- 现存和重建的祖先PhoA酶对Pt氧化活性的生物化学表征.
- 位点定向突变发生,以评估活性位点残留物对PhoA的Pt氧化酶和本源功能的影响.
主要成果:
- 性酸酶 (PhoA) 在细菌中广泛分布,在进化的早期出现,而酸脱酶 (PtxD) 在特定的血统中后来出现.
- 大多数测试的PhoA酶,包括祖先形式,都表现出酸盐氧化活性.
- 破坏PhoA中的活性位点残留物降低了其酸盐氧化酶活性,只对其本源功能产生了部分影响.
结论:
- 酸具有无序的酸盐氧化能力,代表了细菌酸获取的一个被忽视的机制.
- 这种PhoA的杂乱功能在细菌酸盐代谢和生态系统中的酸盐循环中发挥着重要作用.
- PhoA的广泛性表明它在各种环境中对微生物酸盐氧化有很大贡献.
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