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通过人类HSP70分离粉样蛋白的分子剖析

Anne S Wentink¹, Nadinath B Nillegoda^2,3, Jennifer Feufel²

¹Center for Molecular Biology of Heidelberg University (ZMBH) and German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, Heidelberg, Germany. a.wentink@zmbh.uni-heidelberg.de.

|November 12, 2020

概括

人类护理者HSP70,DNAJB1和HSP110可以溶解与帕金森病相关的粉状纤维. 它们针对的是α-synuclein termini,而不是核心,使用协同作用进行分离.

科学领域:

神经科学
分子生物学
生物化学

背景情况:

像α-synuclein一样的粉状纤维是神经退行性疾病的标志,并且抵抗细胞清除.
包括HSP70及其辅助器DNAJB1和HSP110在内的人类辅助器可以在体外分解这些稳定的粉状纤维.
这些陪伴剂溶解预先形成的粉样纤维的精确机制在很大程度上是未知的.

研究的目的:

阐明由HSP70护理系统所涉及的粉状纤维分解的分子机制和关键步骤.
研究DNAJB1和HSP110在向和促进α-synuclein纤维的分解中的特定作用.

主要方法:

生物化学测定用于研究护师和粉样纤维之间的相互作用.
使用核磁共振 (NMR) 光谱来确定分解过程的结构方面.
使用预制的α-synuclein纤维素进行了体外分解试验.

主要成果:

DNAJB1通过多价值相互作用识别寡合α-同核素并将HSP70导向纤维.
HSP70和DNAJB1与纤维表面的α-synuclein的柔性N-和C-终端相互作用,而不是粉样核.
DNAJB1和HSP110的协同作用通过促进高效的HSP70负荷和利用"引力"来加速分解.

结论:

DNAJB1,HSP110和HSP70在粉样分解中的合作是一个不仅涉及传统基质向的活跃过程.
这些辅导体积极重塑粉样基质,突显出超出典型辅导体作用的新功能.
了解有关粉样分解的这些机制性见解对于开发神经退行性疾病的新疗法至关重要.

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