通过PINK1激活parkin的机制
Christina Gladkova1, Sarah L Maslen1, J Mark Skehel1
1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
Nature
|July 12, 2018
概括
帕金蛋白的激活对于细胞和预防青少年帕金森症至关重要,涉及大规模的域重组. 这一过程释放了催化领域,为治疗药物设计提供了新的点.
科学领域:
- 生物化学
- 分子生物学
- 神经科学
背景情况:
- 帕金基因 (PARK2/PRKN) 和PINK1 (PARK6) 的突变会导致青少年自体衰退性帕金森症 (AR-JP).
- 这些突变导致细胞缺陷, 损坏的线粒体的过程.
- 帕金是一种E3泛酸酶,需要PINK1介导的酸化来激活,但机制尚不清楚.
研究的目的:
- 通过PINK1阐明帕金激活的分子机制.
- 了解如何通过酸化解决帕金的自身抑制.
- 确定AR-JP的潜在治疗点.
主要方法:
- 用交换质谱 (HDX-MS) 来追踪全长的人类帕金激活.
- 1.8 化人类帕金晶体结构的确定.
主要成果:
- 在帕金激活过程中,HDX-MS发现了大规模的域重组.
- 化无类域 (-Ubl) 重新结合到帕金核,释放催化RING2域.
- 晶体结构确定了独特的帕金域 (UPD) 上的基-Ubl结合点,并揭示了激活元素 (ACT) 链接区域.
结论:
- 帕金激活涉及显著的域重组,释放催化RING2域.
- AR-JP突变聚集在-Ubl结合部位和ACT链接器中,解释了疾病链接.
- 这些发现提供了帕金基质无处不在的机制,并建议设计帕金激活剂的策略.
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