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SUMOylation保护内皮细胞表达的白细胞特异蛋白1免受乌比基因化介导的蛋白质体退化,并促进其核出口
Mokarram Hossain1, Jiannan Huang1, Yang Su1
1Department of Anatomy, Physiology and Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada.
International journal of molecular sciences
|January 28, 2026
概括
白细胞特异性蛋白1 (LSP1) 是SUMOylated,这种修饰对于其稳定性和内皮细胞的适当贩运至关重要. 这种SUMOylation可以防止蛋白质体的降解,并调节LSP1的活性.
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:
- 白细胞特异蛋白1 (LSP1) 作为内皮细胞守门人,调节细胞的透性和细胞迁移.
- LSP1表现出动态的亚细胞局部化,在TNF-α刺激时从核转移到核外部位.
- 观察到的分子重量差异和局部化变化表明了翻译后的修改.
研究的目的:
- 为了研究LSP1的翻译后修饰,特别是SUMOylation.
- 为了确定参与LSP1SUMOylation和deSUMOylation的酶.
- 确定LSP1 SUMOylation对其稳定性和局部化的功能影响.
主要方法:
- 在小鼠内皮细胞和HEK293T细胞中分析内源性和过度表达的LSP1.
- 确定SUMO1,Ubc9 (结合酶) 和SENP1 (解SUMOylating蛋白酶) 的参与.
- lysine 残留物 (K270,K318) 的位点定向突变发生,以评估 SUMOylation 影响.
主要成果:
- LSP1通过SUMO1进行SUMOylation,由Ubc9促进并由SENP1.1逆转.
- 突变lysines K270和K318取消了SUMOylation,导致通过ubiquitination和proteasomal降解降低了LSP1水平.
- 脱SUMOylation 损害了 TNF-α 诱导的 LSP1.1 的核至细胞骨转位.
结论:
- LSP1是一种SUMO1修饰蛋白.
- SUMOylation通过抑制蛋白质酶体降解来稳定LSP1.
- SUMOylation对于LSP1的亚细胞贩运至关重要,它是对内皮细胞中炎症刺激的反应.
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