对RILPL1与TMEM55B的结合的结构基础显示了通过保存的TBM图案进行适配器组装的溶酶体平台
Dieter Waschbüsch1, Prosenjit Pal2, Raja S Nirujogi2
1School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland.
在VPS35和LRRK2激酶的突变导致Rab GTPase高酸化,形成信号复合体. TMEM55B 作为 lysosomal 膜的中心枢纽, 招募 RILPL1 和其他蛋白质, 揭示新的调节网络.
科学领域:
- 细胞生物学
- 分子生物学
- 结构生物学
背景情况:
- 在VPS35和LRRK2激酶中遗传的突变诱导Rab GTPase过酸化,导致-Rab信号复合体.
- 包括RILP家族蛋白质 (RILPL1,JIP3,JIP4) 在内的Rab效应体能够识别化Rab GTPases (-Rab8A,-Rab10).
- -Rabs和RILPL1定位在溶酶体膜上,与TMEM55B形成多蛋白组合.
研究的目的:
- 阐明TMEM55B与RILPL1相互作用的结构基础及其在溶酶体膜蛋白复合体中的作用.
- 定义TMEM55B绑定动机 (TBM) 并描述TMEM55B作为适配器招聘的中心中心的功能.
主要方法:
- 单独使用TMEM55B和与RILPL1 (TMEM55B结合基因 - TBM) 的复合体的晶体结构.
- 共同免疫沉测定和突变分析以调查蛋白质复合体的形成.
主要成果:
- TMEM55B的细胞系域表现出两个连续的RING类域的刚性结构.
- RILPL1通过其C端TBM结合TMEM55B,主要通过骨干结合和特定的谷氨酸残留物.
- TMEM55B独立地与含有TBM的各种蛋白质 (JIP3,JIP4,OCRL,WDR81,TBC1D9B) 形成复合体.
结论:
- TMEM55B 作为 lysosomal 膜的中心支架蛋白, 招募像 RILPL1 这样的适应蛋白.
- 这些发现揭示了涉及TMEM55B和溶酶体功能的新型调节网络.
- 在TMEM55B的参与之前,RILPL1对溶解体的招募,这表明了一种序列组装机制.
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