通过SCF-RBR E3-E3超级组件对F盒蛋白的结合
Daniel Horn-Ghetko1, David T Krist1,2, J Rajan Prabu1
1Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany.
Nature
|February 4, 2021
概括
由库林-RING (CRL) 和RBR型链酶形成的E3链酶超组件使各种基质的无处不在成为可能. 这种机制利用ARIH1和SCF连接酶来无处不在的基质与传统的E3连接酶系统不兼容.
科学领域:
- 生物化学
- 分子生物学
- 结构生物学
背景情况:
- 对于蛋白质降解至关重要的E3链酶被分类为RING和RBR等域.
- 许多E3连接酶,包括化库林-RING E3连接酶 (CRL) 和ARIH家族RBR类连接酶,形成E3-E3超级组合.
- 这些组合几乎占人类全方位链酶的一半.
研究的目的:
- 调查无处不在的化SCF连接酶和ARIH1的共同进化和机制.
- 阐明E3-E3超级组件如何使多种基板无处不在,特别是那些对传统机制具有挑战性的基板.
主要方法:
- 开发基于活动的化学探测器.
- 低温电子显微镜可视化无处不在的步骤.
- 对SKP1- CUL1- F- 盒 (SCF) 链酶家族与ARIH1的相互作用进行研究.
主要成果:
- 低温EM检测显示了一种涉及E2酶UBE2L3,ARIH1和SCF结合酶的顺序无处不在过程.
- E3-E3机制可促进基质与F盒蛋白结合的无处不在,包括折叠或短基质.
- 这种机制与先前描述的RING E3-only连接酶机制不同.
结论:
- 涉及SCF和ARIH1的E3-E3超级组装机制可实现广泛的基板的无处不在.
- 这种多功能机制可能解释了在生物系统中观察到的普遍存在.
- 这些发现为通过ubiquitin-proteasome系统调节蛋白质降解提供了新的见解.
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