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无转移的酸化对于抑制被编程的-1核糖体框架转移是很重要的
Yueli Zhang1,2,3,4, Zhijian Li1,2,3,4, Huihui Chong1,2,3,4
1NHC Key Laboratory of Systems Biology of Pathogens, National Institute of Pathogen Biology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
Science advances
|December 19, 2025
概括
无转移蛋白 (SFL) 抑制了被编程的-1 核糖体框架转移 (-1 PRF) 和病毒活性. 它的结构和高酸化循环对于RNA结合和抗病毒功效至关重要,由特定的激酶调节.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 病毒学 病毒学
背景情况:
- 无转移 (SFL) 是已知的编程-1 核糖体框架转移 (-1 PRF) 的抑制剂.
- SFL表现出广泛的抗病毒活性.
- 了解SFL的机制是开发新的抗病毒策略的关键.
研究的目的:
- 在结构和生物化学上对人类无变 (SFL) 蛋白质进行表征.
- 阐明SFL的高酸化循环 (HPL) 在其功能中的作用.
- 为了确定调节SFL活动的细胞激酶.
主要方法:
- 进行X射线晶体学以确定SFL的3D结构.
- 生物化学测试来测量RNA结合亲和力.
- 靠近依赖生物化以确定与SFL相互作用的激酶.
主要成果:
- SFL的晶体结构揭示了一个独特的船形模块,具有含有四个化残留物的高化循环 (HPL).
- SFL与纳米分子亲和度 (KD = 5.7 nM) 的HIV-1 -1 PRF序列结合.
- 破坏HPL酸化减少了RNA结合和SFL的抗病毒活性,EEF2K,NEK9和PBK被确定为SFL激酶.
结论:
- SFL的结构,特别是HPL,对于其RNA结合和-1PRF抑制功能至关重要.
- 通过特定激酶 (EEF2K,NEK9,PBK) 的酸化调节SFL活动.
- 这些发现为SFL的抗病毒作用提供了机制性的见解.
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