一个热稳定的T7RNA聚合酶的计算重新设计
Zachary T Baumer1, Timothy A Whitehead1
1Department of Chemical and Biological Engineering, University of Colorado Boulder; Boulder, 80305, USA.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
我们使用计算设计设计设计了一种高度稳定的T7 RNA聚合酶 (T7 RNAP),实现了创纪录的54.9°C的功能稳定性. 这种增强的酶保持了显著的活性,推动了生物技术应用.
科学领域:
- 生物化学和分子生物学
- 蛋白质工程是指蛋白质工程.
- 计算生物学 计算生物学
背景情况:
- T7RNA聚合酶 (T7RNAP) 对于生物技术至关重要,但由于其低热稳定性 (43-44°C) 而受到限制.
- 现有的稳定变体有局限性,包括商用版本的专有序列.
研究的目的:
- 使用基于结构的计算设计开发一种高度稳定的T7RNA聚合酶变体.
- 为了提高T7RNAP的热稳定性,同时保持其酶活性.
主要方法:
- 从先前稳定变异中结合的突变与PROSS (合理选择蛋白质工程) 识别的新突变.
- 使用数据驱动启发式来保持蛋白质功能的过突变.
- 通过热挑战测定和循环二极化谱法评估热稳定性.
主要成果:
- 设计的变体T7T+,具有54.9°C的功能稳定性 (T50),比之前最好的开源变体增加了2.4°C.
- 循环二重化谱学表明表面化温度为53.8°C.
- 在37°C时,T7T+保留了59%的野生类型活动,证明了稳定性和功能的平衡.
结论:
- 基于结构的计算设计成功创建了一个显著更热稳定的T7 RNAP.
- 高成功率 (16/18个设计) 验证了设计稳定,功能性蛋白质的计算方法.
- 通过AddGene可获得T7T+等离子体,用于非商业研究,以促进其在生物技术中的使用.
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