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Quantifying Subcellular Ubiquitin-proteasome Activity in the Rodent Brain
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通过ubiquitin-proteasome路径降解CFTR
C L Ward1, S Omura, R R Kopito
1Department of Biological Sciences, Stanford University, California 94305-5020, USA.
Cell
|October 6, 1995
概括
囊性纤维化突变导致囊性纤维化跨膜导电性调节器 (CFTR) 蛋白质的快速降解. 这项研究表明,无处不在的标错误地折叠了CFTR,通过蛋白酶体路径降解.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 大多数囊性纤维化病例源于突变破坏了囊性纤维化跨膜导电调节器 (CFTR) 的折叠.
- 错误折叠的CFTR蛋白在达到成熟之前,在内质网膜 (ER) 中迅速降解.
- 参与ER相关的完整膜蛋白质 (如CFTR) 降解的精确机制和蛋白酶尚不清楚.
研究的目的:
- 调查野生型和突变性囊性纤维化跨膜导电性调节器 (CFTR) 蛋白质的降解途径.
- 阐明在准错误折叠的CFTR降解过程中,ubiquitination和蛋白酶体的作用.
主要方法:
- 使用蛋白酶体抑制剂来阻止蛋白质降解.
- 采用主导阴性无素突变体和温度敏感的无素激活酶突变.
- 分析了CFTR的无处不在状态,使用西式涂抹.
主要成果:
- 蛋白质酶抑制剂显著抑制了野生类型和突变CFTR的降解.
- 抑制蛋白酶活性导致聚基化不成熟CFTR的积累.
- 阻断无处不在的途径也防止了CFTR降解,证实了其至关重要的作用.
结论:
- 乌比基化是错误折叠的囊性纤维化跨膜导电调节器 (CFTR) 蛋白质快速降解所需的关键步骤.
- 蛋白质酶机器参与清除不成熟的CFTR从内分泌网膜.
- 了解这种降解途径可能为囊性纤维化提供治疗点.
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