交替结合和SDS22和I3的p97介导解离,在全酸酶之间循环活性PP1
Anja F Kueck1, Johannes van den Boom1, Sandra Koska1
1Molecular Biology I, Center of Medical Biotechnology, Faculty of Biology, University of Duisburg-Essen, 45141 Essen, Germany.
蛋白酸酶-1 (PP1) 与SDS22和抑制剂-3形成抑制复合体,这些复合体由p97 ATPase分解. 这个循环调节PP1活动和子单元交换,保持一个动态的全酸酶格局.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 蛋白酸酶-1 (PP1) 对于细胞过程至关重要,形成具有各种向子单元的活性全酸酶.
- 新合成的PP1被抑制剂-dis2-number-2 (SDS22) 和抑制剂-3 (I3) 暂时抑制,其分解由AAA+ ATPase p97介导.
研究的目的:
- 为了研究SDS22-PP1-I3复合体在PP1生物发生之外的作用.
- 通过p97驱动的拆卸周期阐明PP1功能和子单元交换的调节机制.
主要方法:
- 在体外对标记蛋白质进行共振能量转移 (FRET) 分析.
- 在体外和细胞模型中抑制p97.
主要成果:
- 对于成熟的PP1.1,SDS22-PP1-I3复合体充当热力学水槽.
- 通过p97介导的分解释放了SDS22和I3,释放了PP1以形成具有针对性子单元的活性全酸酶,如GADD34.
- 抑制p97导致PP1被SDS22和I3封存,取代其他目标子单元,并表明抑制复合物的热力学优势.
结论:
- PP1的功能是通过SDS22-PP1-I3复合体形成和p97驱动的拆卸循环来动态调节的.
- 这种依赖ATP的过程保持了稳定状态,确保PP1可用于各种细胞作用,并促进亚单元交换.
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