描述TRPV4 ankyrin重复域互动组及其因神经肌肉疾病引起突变的破坏
Alexis K Loder1, Gage P Kosmanopoulos2, William H Aisenberg1
1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
The Journal of biological chemistry
|December 3, 2025
概括
TRPV4的基林重复域 (ARD) 与许多蛋白质相互作用,包括那些参与无处不在和GTPase信号的蛋白质. 致病突变会破坏这些相互作用,影响TRPV4通道功能,并可能导致神经肌肉疾病.
科学领域:
- 离子通道生物物理学
- 分子细胞生物学分子细胞生物学
- 神经肌肉疾病的遗传学
背景情况:
- 安基林重复域 (ARDs) 是在真核蛋白中发现的关键蛋白质-蛋白质相互作用动机.
- 在瞬态受体潜能 (TRP) 超级家族中,ARDs位于离子通道的N端,包括TRPV4.4.
- 与神经肌肉疾病相关的TRPV4的功能获取突变聚集在ARD表面,表明其具有关键作用.
研究的目的:
- 为了全面描述野生型 (WT) 和突变型TRPV4 ARD的互动体.
- 为了确定致病突变如何改变TRPV4 ARD互动组.
- 调查改变的相互作用对TRPV4通道活性和神经肌肉疾病发病的功能后果.
主要方法:
- 人类蛋白质组微阵列分析以确定TRPV4 ARD相互作用体.
- 在基于细胞的模型中,共免疫沉测试验证蛋白质相互作用.
- 成像研究,以评估TRPV4通道活性,以应对基因操纵.
主要成果:
- TRPV4 WT-ARD与78种蛋白相互作用,包括NEDD4L和ARHGEF10,参与无处不在和小GTPase信号传递.
- 21种TRPV4ARD相互作用受到致病突变的显著影响.
- 在神经肌肉疾病中也有突变的ARHGEF10,显示与突变TRPV4的结合减少,并且在突变存在时,它对TRPV4活性的抑制作用会消失.
结论:
- TRPV4 ARD是通道功能至关重要的多种蛋白质相互作用的枢纽.
- 与疾病相关的突变破坏了特定的TRPV4 ARD相互作用,导致道活性发生变化.
- 对ARHGEF10-TRPV4相互作用的失调可能有助于神经肌肉疾病的病理生理学.
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