由素-泛素诱导的帕金激活的机制
Tobias Wauer1, Michal Simicek1, Alexander Schubert1
1Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
Nature
|July 11, 2015
概括
帕金结合酸化无素的晶体结构揭示了突变如何导致帕金森症. 这一发现解释了PARKIN的激活,并为该疾病提出了新的治疗点.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 神经科学是一个神经科学.
背景情况:
- 在PARKIN (PARK2) 和PINK1 (PARK6) 中的突变会导致自体逆向青少年帕金森症 (AR-JP).
- 帕金和PINK1在线中合作,去除受损的线粒体.
- PINK1可化泛基素和PARKIN Ubl域,在去极化线粒体上招募和激活PARKIN.
研究的目的:
- 为了阐明PARKIN被酸化的ubiquitin招募和激活的分子机制.
- 了解AR-JP相关突变如何影响PARKIN功能.
主要方法:
- 在Pediculus humanus PARKIN的X射线晶体学中,ParkIN与Ser65-phosphorylated ubiquitin (phosphoUb) 复合在一起.
主要成果:
- 晶体结构显示phosphoUb与PARKIN上的保存酸盐口袋结合,解释了招募和激活.
- 酸结合会诱导形状变化,释放抑制的UBL域,并激活PARKIN.
- 这种 phoshoUb 介导的 Ubl 释放增强了 PINK1 进一步的 Ubl 酸化,稳定了活性 PARKIN 构造.
结论:
- Ubl 域充当了由 phosphoUb.Ub.释放的受约束的激活元素.
- 这项研究阐明了PARKIN激活的结构基础及其在帕金森症中的作用.
- 确定了开发小分子帕金激活剂的潜在策略.
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