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从昆虫细胞表达系统中净化酶活性APOBEC蛋白质
Linda Chelico1, Madison B Adolph2
1Department of Biochemistry, Microbiology, and Immunology, University of Saskatchewan, Saskatoon, SK, Canada.
Methods in enzymology
|April 18, 2025
概括
我们开发了一种baculovirus表达系统,用于净化人类APOBEC酶. 这种方法为重要的体外生化和结构研究提供了高度活性和可溶性酶.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 包含11个人类成员的APOBEC酶家族对于包括发育,新陈代谢和免疫在内的重要生物过程至关重要.
- 这些酶的功能是通过在RNA或单链DNA中将细胞氨酸解胺为 uracil,从而影响诸如脂质吸收,免疫基因多样化,病毒限制和肌肉分化等过程.
- 在体外表征APOBEC酶活性对于理解它们的生理作用至关重要,需要高活性和可溶性纯化酶的可用性.
研究的目的:
- 建立一个强大的复合百科病毒表达和净化系统,用于所有人类APOBEC酶使用Spodoptera frugiperda 9 (Sf9) 细胞.
- 优化净化策略,以获得足够数量的适合生物化学和结构分析的活性和可溶性APOBEC酶.
- 为表达和净化不仅是已知的APOBEC家族成员,而且是新的APOBEC基因提供一个多功能平台.
主要方法:
- 开发用于APOBEC酶生产的Sf9昆虫细胞中的复合性baculovirus表达系统.
- 多个APOBEC家族成员的净化,包括APOBEC1,APOBEC3A,APOBEC3B,APOBEC3C,APOBEC3F,APOBEC3G和APOBEC3H (二,五,七等类型).
- 实施三个不同的净化协议,以适应不同APOBEC酶的不同表达水平和可溶性特征.
主要成果:
- 从Sf9细胞中成功表达和净化所有测试的人类APOBEC家族成员.
- 取得了适合生物化学测试的产量,其中一些酶以毫克数量净化,足以进行结构研究.
- 证明了开发的净化方法在获得活性和可溶性APOBEC酶方面的有效性.
结论:
- 已建立的baculovirus表达和Sf9细胞净化系统为体外研究提供了有效的人类APOBEC酶的可靠来源.
- 该系统可为APOBEC酶家族的功能进行详细的生化和结构研究.
- 描述的方法适用于新型APOBEC基因的表达和净化,推动了该领域的研究.
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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
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