半合成 CoA-α-Synuclein 构造陷 N-终端乙转移酶 NatB 用于结合机制研究
Buyan Pan1, Sarah M Gardner2,3, Kollin Schultz2,3
1Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States.
Journal of the American Chemical Society
|June 15, 2023
概括
人类NatB (hNatB) 的N终端乙化会影响帕金森病中的αS. 这项研究显示,当αS与hNatB结合时,它仍然是无序的,并在C端扩展,从而提供了对酶抑制的见解.
科学领域:
- 生物化学
- 结构生物学
- 神经科学
背景情况:
- N端乙化是一种关键的蛋白质修饰.
- 人类N终端乙转移酶B (hNatB) 乙化α-synuclein (αS),这是一个涉及帕金森病病因的蛋白质.
- 之前的研究解决了hNatB与αS N端的相互作用,但其余蛋白质的作用尚不清楚.
研究的目的:
- 研究hNatB结合对全长αS的结构和形状的影响.
- 开发和使用新的方法来研究具有挑战性的蛋白质酶相互作用.
- 了解对hNatB基质识别和帕金森病的影响.
主要方法:
- 合成hNatB的双基质抑制剂,使用原生化学结合,结合全长αS和光探针.
- 低温电子显微镜 (cryo-EM) 来确定hNatB/抑制剂复合物的结构.
- 单分子弗斯特共振能量转移 (smFRET) 来探测αS形态动力学.
- 用计算建模来解释结构和动态数据.
主要成果:
- 首次合成了基于αS的hNatB双基质抑制剂.
- 低温EM显示,当与hNatB结合时,αS在N端之外仍然存在很大程度上的失序.
- 在hNatB结合时,smFRET显示了αS的C端扩张.
- 计算模型解释了这些形状变化及其对酶抑制的影响.
结论:
- 在与hNatB结合时,全长的αS表现出显著的乱和C端扩张.
- 这些发现提供了对hNatB基质识别和抑制机制的结构见解.
- 这项研究提出了一种强大的综合方法, 结合了半合成,冷EM,smFRET和模拟来解决具有挑战性的结构生物学问题.
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