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源自SARS-CoV-2的蛋白质Orf9b通过与自身抑制的KA1域相互作用来增强MARK2活性
Daiki Homma1, Sophia Jobien M Limlingan1, Taro Saito1,2
1Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Japan.
SARS-CoV-2 Orf9b蛋白通过结合其自身抑制域来增强微管细胞亲和调节激酶2 (MARK2) 的活性. 这种相互作用可以促进MARK2的活性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 病毒学 病毒学
背景情况:
- 微管类亲和调节酶2 (MARK2) 是一个关键的Ser/Thr蛋白酶.
- 马克2在调节细胞极性和免疫反应方面起着至关重要的作用.
- Orf9b是一种辅助蛋白质,由SARS-CoV-2基因组编码.
研究的目的:
- 为了研究SARS-CoV-2 Orf9b和MARK2.2之间的相互作用.
- 确定Orf9b影响MARK2活动的机制.
主要方法:
- 在HEK293细胞中Orf9b和MARK2的同时表达.
- 激酶活动测定.
- 对MARK2的突变分析,包括KA1域和T595位点的删除.
主要成果:
- Orf9b显著增强了MARK2激酶的活性.
- Orf9b与MARK2.2的自身抑制的KA1域相互作用.
- Orf9b对MARK2活动的增强取决于KA1域的存在.
- Orf9b在MARK2的T595位点降低了抑制酸化,尽管该位点对于观察到的增强并不重要.
结论:
- SARS-CoV-2 Orf9b直接与MARK2.2相互作用并激活它.
- Orf9b与自身抑制的KA1域结合,导致MARK2激酶活性增加.
- 这种相互作用为SARS-CoV-2提供了一个潜在的机制,通过MARK2.2调节宿主细胞过程.
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