益生菌受体通过与酸-4,5-双酸盐的共同结构形成,对Janus酶2进行支架
Raul Araya-Secchi1,2, Katrine Bugge3, Pernille Seiffert3
1Structural Biophysics, Section for Neutron and X-ray Science, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
eLife
|May 26, 2023
概括
益生菌受体 (PRLR) 与PI(4,5) P2和JAK2形成一个复合体,稳定其信号传输结构. 这种脂蛋白相互作用对于激活STAT5信号通路至关重要.
科学领域:
- 细胞信号传输和分子生物学
- 生物物理和结构生物学
背景情况:
- 第1类细胞因子受体利用单一的跨膜螺旋来进行信号转导.
- 脂质,特别是酸在益生菌受体 (PRLR) 信号传递中的作用仍然在很大程度上未被定义.
研究的目的:
- 阐明氨酸-4,5-双酸盐 (PI(4,5) P2) 在益生素受体 (PRLR) 信号传导中的结构和功能作用.
- 为了研究PRLR细胞内域,PI(4,5) P2和Janus激酶2 (JAK2) 之间的相互作用.
主要方法:
- 综合结构生物学方法结合了NMR光谱学,细胞信号测试和计算建模.
- 位点定向的突变发生,以探测已识别的PI (4,5) P2相互作用位点的功能.
主要成果:
- 在人类PRLR,PI(4,5) P2的无序细胞内域和JAK2.2的FERM-SH2域之间证明了共同结构的形成.
- 观察到PI(4,5) P2在跨膜螺旋接口上的积累,并确定了特定的相互作用残留物.
- 在PI ((4,5) P2结合部位的突变损害了PRLR介导的STAT5激活.
- 在PRLR的柔膜区域,在辅结构中采用了延伸的形状.
结论:
- 该PRLR-JAK2-PI ((4,5) P2共结构稳定PRLR细胞内域,促进信号继电器在连接物结合.
- 这种脂蛋白复合体的形成被认为是调节PRLR信号的机制.
- 类似的协同结构机制可能参与其他非受体氨酸激酶的信号传递.
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