以结构为导向的方法来修改人体脱糖酶-1 (hDJ-1) 蛋白质的基质特异性
Sera A Fernandes1, Subrata Dasgupta2, Rashmi S Tupe1
1Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Lavale, Pune, 412115, Maharashtra, India.
Biochemical and biophysical research communications
|September 9, 2023
概括
通过修改一个关键的谷氨酸酸盐残留物来研究人类降糖酶-1 (hDJ-1) 酶活性. 这种单一的氨基酸变化增强了hDJ-1的功效.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 糖化是一种非酶的蛋白质修饰糖,有助于细胞损伤和疾病.
- 人体脱糖酶-1 (hDJ-1) 水解糖化蛋白质,减少糖性压力.
- 活性部位的氨酸 (Cys106) 涉及hDJ-1的特异性,但Glu18的作用也被建议.
研究的目的:
- 调查谷氨酸18 (Glu18) 在人类脱糖酶-1 (hDJ-1) 的基质特异性中的作用.
- 为了设计一个具有潜在改变或改善基质特异性的突变hDJ-1.
- 评估单个氨基酸替代对hDJ-1的催化效率和基质结合的影响.
主要方法:
- 使用局部导向突变发生 (SDM) 来将Glu18转化为阿斯巴酸盐 (Asp18),从而产生突变的DJ-1 (mDJ-1).
- 野生类型的hDJ-1和mDJ-1均以大肠杆菌表达,并经过净化.
- 对mDJ-1的酶动力学 (kcat和Km) 用N-乙半氨酸 (NacCys),N-乙氨酸 (NacLys) 和N-乙四氨酸 (NacArg) 基质来确定.
主要成果:
- 与野生型hDJ-1相比,突变DJ-1 (mDJ-1) 呈现出改变的动力参数.
- 从Glu18到Asp18的单个氨基酸变化显著改善了mDJ-1对N-乙氨酸 (NacLys) 和N-乙氨酸 (NacArg) 的基质特异性.
- 在mDJ-1中,NacLys和NacArg的催化效率 (kcat/Km) 得到了提高.
结论:
- 谷氨酸18在确定人类脱糖酶-1的基质特异性方面发挥着至关重要的作用.
- 在Glu18位置的hDJ-1工程可以增强对某些糖化氨基酸残留的特异性.
- 了解这些结构功能关系可能有助于开发基于hDJ-1的治疗方法,治疗与糖化相关的疾病,如糖尿病并发症.
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