细菌E1类酶的工程反应性使得ATP驱动的蛋白质C termini的修饰成为可能
Clara L Frazier1, Debashrito Deb1, Amy M Weeks1,2
1Department of Biochemistry, University of Wisconsin - Madison, Madison, WI, USA 53706.
bioRxiv : the preprint server for biology
|May 27, 2024
概括
研究人员使用细菌MccB酶开发了一种ATP驱动的蛋白质修饰平台. 这种方法可以实现精确的C端功能化和结,模仿先进生物结合的生物策略.
科学领域:
- 生物化学 生物化学
- 合成生物学 合成生物学
- 蛋白质化学 蛋白质化学
背景情况:
- 生物系统利用腺三酸盐 (ATP) 进行能源密集的过程,如键形成.
- 蛋白质化学家目前缺乏类似的工具,以有效地推动合成和修改在体外.
- 欧核细胞的泛素化级联,涉及泛素激活 (E1) 酶,提供了一个ATP依赖激活的模型.
研究的目的:
- 开发一种ATP驱动的平台,用于C端激活和结合在体外.
- 为了设计一种细菌酶,MccB,用于非本地基质的修饰和功能化.
- 创建用于高产量,特定部位的蛋白质生物结合的工具,使用酸中间体.
主要方法:
- 利用E大肠杆菌MccB,E1酶的细菌祖先,用于C端胺酸键的形成.
- 开发了用于指导蛋白质生物结合的提奥埃斯特化C终端手柄 (TeCH) 标签.
- 通过探索MccB酶家族的自然多样性来设计直角的MccB/TeCH-tag对.
主要成果:
- 证明MccB能够激活非本土基质,形成O-AMP化电友的能力.
- 展示了各种C端功能组的生成,包括多用途的硫.
- 通过TeCH-tag和 thioester中间体实现了高产量,ATP驱动的蛋白质生物结合.
- 建立了相互坐标的MccB/TeCH标签系统,用于复杂的生物结合物合成.
结论:
- 开发的ATP驱动平台有效地模仿了用于体外蛋白质操纵的生物键合成.
- MccB/TeCH标签系统为精确,高产量的蛋白质修饰和生物结合提供了一个强大的工具.
- 这种方法使复杂的生物结合物能够以分子精度进行合成,从而提高了蛋白质工程能力.
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