结合计算,理性和实证设计的耐沸的氨酸酶
Yong Yang1, Yuewen Luo1, Yidi Ding1
1Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan University, Wuhan, China.
Applied and environmental microbiology
|December 10, 2025
概括
工程设计的蛋白酶C2变体表现出增强的热稳定性和对极端条件的抗性. 这些耐沸的酶为工业应用提供了改善的酸盐降解.
科学领域:
- 生物技术是生物技术.
- 蛋白质工程是指蛋白质工程.
- 酶学 是一种酶学.
背景情况:
- 酸酶工程对于了解蛋白质稳定性和处理酸废物至关重要.
- 来自Thermoactinomyces vulgaris CDF的主要角酶的亚丁类蛋白酶C2,在90°C以上的温度下具有有限的稳定性.
研究的目的:
- 增强蛋白酶C2.2的热稳定性和功能范围.
- 开发强大的酶,在极端条件下有效降解质素.
主要方法:
- 使用自动计算工具 (PROSS,FireProt,ProteinMPNN,HyperMPNN,ThermoMPNN) 进行单点突变设计.
- 采用了以表面离子对和proline替代为重点的合理设计.
- 通过修改结合位 (Ca1,Ca3,Ca4) 进行了综合实证工程.
- 进行了分子动力学模拟,以确定灵活的区域.
主要成果:
- 四个单点突变在85°C时保持了72%-84%的活性,超过了野生类型 (~54%).
- 变种SM9,结合九种突变,在100°C下半衰期约为4小时.
- 变种CM16,结合SM9和CM1突变,在100°C时的半衰期超过9小时.
- SM9和CM16表现出对高度,盐度,尿素,SDS,有机溶剂和减少剂的抗性.
结论:
- 结合计算,理性和经验工程,显著提高了蛋白酶C2的热稳定性.
- 工程变体 (SM9,CM16) 是高度稳定和功能接近/超过100°C,具有多极限的抗性.
- 这些超耐热酶在料,食品和皮革行业具有潜在的应用,因为它们能有效降解质.
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