在多个位点上均存在基因的 USP14双基因
Byung-Hoon Lee1, Ying Lu2, Miguel A Prado1
1Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|April 14, 2016
概括
乌比基特异蛋白酶14 (USP14) 迅速从B环素中去除乌比基链,防止其降解. 这种双化过程调节基于泛链架构的蛋白质体特异性.
科学领域:
- 分子生物学
- 生物化学
- 细胞生物学
背景情况:
- USP14是调节蛋白质组功能的关键二化酶.
- 对于USP14在蛋白质循环中的基质特异性尚不清楚.
研究的目的:
- 为了研究USP14的基质特异性.
- 阐明USP14调节蛋白质降解的机制.
主要方法:
- 单分子研究
- 乌比丁-环素B结合物的分析
- 蛋白酶活性测定
主要成果:
- USP14主要针对多基化B环酸合物.
- 在USP14中,除掉了单个ubiquitin组而不是"一块"的ubiquitin链.
- USP14的快速作用通过毫秒时间表来防止蛋白质体的降解.
- 通过USP14降低结合物在蛋白质组的停留时间.
结论:
- USP14的特异性是由无处不在的链架构决定的,特别是多个修改.
- 通过USP14快速移除ubiquitin链是一种调节蛋白酶基质特异性的机制.
- 这项研究揭示了蛋白质酶对ubiquitin结合物识别的新方面.
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