通过J-域蛋白DNAJC12的结构识别和稳定氨酸氧酶
Mary Dayne S Tai1,2, Lissette Ochoa3, Marte I Flydal1,4
1Department of Biomedicine, University of Bergen, Bergen, Norway.
Nature communications
|March 21, 2025
概括
DNAJC12蛋白中的致病变体通过破坏其与氨酸氧酶 (TH) 的相互作用引起帕金森症. DNAJC12结合稳定TH,防止聚合并保持多巴胺的产生.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- J-域蛋白DNAJC12的致病变体与帕金森症有关.
- 这种神经疾病与DNAJC12和氨酸氧酶 (TH) 之间的相互作用受损有关.
- 氨酸氧酶 (TH) 是多巴胺生物合成中的速度限制酶.
研究的目的:
- 描述TH:DNAJC12复合体构成的结构和功能方面.
- 阐明DNAJC12结合影响TH稳定性,聚合和活性的机制.
- 了解DNAJC12在TH缺乏和帕金森症中的作用.
主要方法:
- 对TH和DNA的复杂形成分析JC12.
- 评估TH和TH-p.R202H变体的稳定性和聚合.
- 测量TH活性和多巴胺反抑制.
- 电子显微镜 (Cryo-EM) 和交联质谱法 (XL-MS) 用于结构的确定.
主要成果:
- DNAJC12结合稳定了野生型TH和易聚合的变体TH-p.R202H.
- DNAJC12结合延迟TH聚合独立于Hsp70.0.
- TH:DNAJC12复合体保留了TH活性和多巴胺反抑制.
- 冷EM检测显示,两个DNAJC12单体与TH四聚体结合,与调节域二聚体相互作用.
- DNAJC12的C端区域对于TH结合至关重要,解释了疾病变体p.W175Ter的致病性.
结论:
- DNAJC12稳定TH,防止聚合和保存多巴胺合成,从而抵消致病变异型的影响.
- 结构洞察力揭示了DNAJC12如何与TH相互作用,维持酶功能并解释疾病机制.
- 这项研究为DNAJC12相关的帕金森症提供了分子基础,并突出了治疗潜力.
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