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SKP1的一个非正规功能调节了自和非传统分泌之间的切换
Jie Li1,2, Gregory J Krause3,4, Qi Gui1,2
1Department of Biochemistry and Molecular Pharmacology, New York University Grossman School of Medicine, New York, NY 10016, USA.
Science advances
|October 13, 2023
概括
哺乳动物SKP1作为一种依赖营养的开关,通过自或非传统的分泌途径调节细胞质量控制. 这一发现影响了对细胞平衡和分泌机制的理解.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 自-溶解体系统对于细胞质量控制和能量平衡至关重要.
- 内分泌体通过血融合参与了降解和非传统分泌.
- 已知SKP1是SCF/CRL1泛基因酶的一个组成部分.
研究的目的:
- 为了确定SKP1在内酶体中的一种新型的,无素酶独立的功能.
- 阐明SKP1酸化和修饰在调节细胞过程中的作用.
- 确定SKP1如何将营养状况与自和非传统分泌联系起来.
主要方法:
- 使用哺乳动物细胞模型研究了内解体中的SKP1功能.
- 分析了Thr131中的SKP1酸化及其与V-ATPase子单元的相互作用.
- 研究了SKP1的SUMOylation,PPM1B的脱,以及与SEC22B的相互作用.
主要成果:
- 在营养缺乏的条件下,SKP1对Thr131的酸化促进了V-ATPase的组合,内分泌体酸化和降解.
- 在营养丰富的条件下,SUMOylated SKP1被脱,与SEC22B相互作用,促进非传统的分泌.
- SKP1酸化作为一个分子开关,控制自和非传统分泌之间的平衡,基于营养的可用性.
结论:
- SKP1在内酶体中具有一种新的功能,与其在全方位素连接酶中的作用不同.
- 细胞营养状况决定SKP1的修饰 (酸化/SUMOylation),从而控制不同的细胞通路.
- 这项研究揭示了一种关键机制,它将营养感知与自和非传统分泌的调节联系起来.
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