人类D-etiolated-1通过组装一个CUL4A泛基因酶来调节c-Jun
Ingrid E Wertz1, Karen M O'Rourke, Zemin Zhang
1Department of Molecular Oncology, Genentech, Inc., South San Francisco, CA 94080, USA.
Science (New York, N.Y.)
|January 24, 2004
概括
人类DET1 (hDET1) 形成一种泛素酶复合体,降解c-Jun原型基因转录因子. 这一发现澄清了DET1在哺乳动物细胞中的功能,并确定了c-Jun调节的新机制.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 阿拉比多普西斯塔利亚纳 脱化-1 (AtDET1) 是一种调节光形生成的保存蛋白.
- 生物化学机制和DET1正方体的更广泛的功能仍然在很大程度上是未知的.
- 了解DET1在哺乳动物系统中的作用对于破译其保存功能至关重要.
研究的目的:
- 在哺乳动物细胞中研究人类DET1 (hDET1) 的生物化学机制和功能.
- 为了确定hDET1.1.的蛋白质合作伙伴和酶活性.
- 确定hDET1在调节特定细胞通路中的作用.
主要方法:
- 用RNA干扰 (RNAi) 来切除已识别的hDET1复合物的子单元.
- 在c-Jun蛋白质上进行了乌比基化和降解试验.
- 对c-Jun激活转录的分析是在亚单元切除后进行的.
主要成果:
- 人类DET1 (hDET1) 组装了一个多子单元的ubiquitin酶复合体.
- 这种复合体包括DNA损伤结合蛋白-1 (DDB1),库林4A (CUL4A),库林调节器-1 (ROC1) 和构成性光形致-1.
- hDET1促进原型瘤转录因子c-Jun的无处不在和降解.
- 任何复杂子单元的消去都会稳定c-Jun,并增加其转录活性.
结论:
- 一种新型的c-Jun全方位酶复合物已被描述,其中hDET1是关键组成部分.
- hDET1通过准c-Jun进行降解,在哺乳动物细胞中发挥特定作用.
- 这项研究定义了DET1在通过蛋白质降解来调节基因表达中的保留功能.
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