机械敏感TMEM63通道病变的结构和功能基础
Wang Zheng1, Augustus J Lowry2, Harper E Smith3
1Departments of Otolaryngology & Neurology, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115, USA; Department of Neuroscience, University of Wisconsin-Madison, Madison, WI 53705, USA.
机械敏感离子通道TMEM63A/B/C突变导致神经发育障碍. 疾病突变唤起构成性脂质杂乱酶活性,揭示了TMEM63通道病变中一种新的力感应机制.
科学领域:
- 生物物理学的生物物理.
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- TMEM63A, -B 和 -C 是哺乳动物机械敏感离子通道,涉及神经发育障碍.
- 强行激活TMEM63通道的确切机制以及疾病突变的功能影响仍然不清楚.
研究的目的:
- 为了阐明TMEM63B p.V44M突变的结构和功能基础.
- 调查疾病相关突变在TMEM63通道活性和脂质杂乱中的作用.
主要方法:
- 使用X射线晶体学来解决TMEM63A p.V53M在封闭状态和脂质开放状态中的结构.
- 用分子动力学模拟来研究通过突变道的脂质杂乱.
- 进行了生物化学测试,以评估道活性和脂质混杂酶功能.
主要成果:
- TMEM63B p.V44M 和 TMEM63A p.V53M 突变是功能获取,诱导构成性脂质杂乱酶活性,而不是增强道关.
- 结构分析显示,毛孔层螺旋体发生了重大重新排列,形成了侧面裂,促进了脂质杂乱.
- 破坏水锁,一个含有突变部位的潜在力感应模块,触发了这些结构变化.
结论:
- 在TMEM63通道中与疾病相关的突变可能导致构成性脂质杂乱酶活性.
- 一种涉及疏水锁的新型力传感机制可能调节TMEM63通道功能.
- 这些发现为TMEM63通道病变及其潜在的分子基础提供了机制性的见解.
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