选择性激活GPCRs:分子动力学显示Siponimod结合,但未能激活S1PR2,与S1PR1不同
Kumari Soniya1, Kruthika Avadhani1, Chanukya Nanduru1
1Computational Chemistry Department, Aganitha.ai, 512T, Road number 29, Jubilee Hills, Hyderabad, Telangana 500033, India.
Journal of chemical information and modeling
|December 4, 2025
概括
西波尼莫德通过改变受体动态来选择性地准S1PR1而不是S1PR2. 分子动力学模拟揭示了Siponimodod 的存在.
科学领域:
- 药理学和药物发现
- 结构生物学 结构生物学
- 计算化学的计算化学
背景情况:
- G蛋白结合受体 (GPCR) 是关键的药物标,但在类似的受体之间实现选择性是具有挑战性的.
- 氨酸-1-酸盐受体 (S1PRs) 是免疫和心血管功能重要的GPCRs.
- 西波尼莫德选择性地向S1PR1治疗多发性硬化症,但这种选择性的分子基础尚不清楚.
研究的目的:
- 调查Siponimod对S1PR1对S1PR2.2的选择性的分子基础.
- 了解S1P和西波尼莫德结合如何影响S1PR1和S1PR2.2的结构动态.
- 通过Siponimod.来确定区分S1PR1和S1PR2调制的关键结构特征.
主要方法:
- 使用了长期规模的分子动力学模拟.
- 分析的重点是S1PR1和S1PR2.2.中的联结和诱导的构造变化.
- 特别注意的是跨膜螺旋动力学和侧链运动.
主要成果:
- 无论是S1P还是Siponimod都有效地结合到S1PR1和S1PR2.2的活性位点.
- 西波尼莫德诱导的S1PR1中的类似激活的形状变化,但不是S1PR2.
- 西波尼莫德与S1PR2结合改变了TM7的残留动态,并促进了TM6的非活性样构造.
结论:
- 西波尼莫德对S1PR1的选择性是由于它无法诱导S1PR2.2中的激活形状变化.
- 在S1PR2中,TM7残留物和TM6螺旋的变化动态使西波尼莫德的作用有所区别.
- 这些发现为设计选择性S1PR调节器提供了洞察力,并强调了分子动态在药物发现中的实用性.
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