来自Mycobacterium tuberculosis的proline脱酶和Pyrroline 5碳酸盐脱酶:对基质通道的证据
Santosh Kumar1, Steven Sega1, Jamie K Lynn-Barbe1
1Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523-1682, USA.
氨酸脱酶 (PruB) 和P5C脱酶 (PruA) 对于Mycobacterium结核病复制是必不可少的. 这些酶的特征揭示了它们的基质特异性和在代谢流和保护中的潜在作用.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 微生物学 微生物学
背景情况:
- 氨酸脱酶 (PruB) 和∆ 1-pyrroline-5-carboxylate (P5C) 脱酶 (PruA) 对于* Mycobacterium tuberculosis*复制至关重要.
- 这些酶催化了氨酸的氧化成谷氨酸,这是一个重要的代谢途径.
研究的目的:
- 为了表达,净化和表征来自*M.结核病*的单功能PruB和PruA酶.
- 研究PruB和PruA的基质特异性和运动性质,包括它们与子电子受体和P5C的相互作用.
主要方法:
- 使用*Mycobacterium smegmatis*系统进行PruB和PruA的重组表达和净化.
- 使用天然基质和化学合成的类似物进行酶性表征.
- 动力分析,包括确定特异性常数 (K) 和迈凯利斯常数 (Km).
主要成果:
- 普鲁B与各种利波金类型表现出活性,对menaquinone类型比benzoquinone类型具有更高的特异性.
- 菌根PruA的特征是第一次,P5C的K值为120±0.015μM,NAD+的K值为33±4.3μM.
- 氨酸竞争性地抑制了PruA,这表明PruB和PruA之间存在基质通道.
结论:
- 标志性重组PruB和PruA酶对*M.结核病*至关重要.
- PruB和PruA之间的基质道可能会增强代谢流量,并保护细菌免受甲基氧毒性.
- 了解这些酶为抗结核病药物开发提供了潜在的目标.
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