通过结合来自的激素激动剂来激活多素-1信号传递
Shristi Pawnikar1, Brenda S Magenheimer2,3, Keya Joshi4
1Center for Computational Biology and Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66047.
bioRxiv : the preprint server for biology
|January 23, 2024
概括
来自多素-1 (PC1) 蛋白的茎区域的合成可以重新激活其信号传输. 这一发现为自身主导性多囊性病 (ADPKD) 的机制和潜在的治疗标提供了新的见解.
科学领域:
- 分子生物学和生物物理学
- G蛋白结合受体 (GPCR) 信号传递
- 结构动力学和计算建模.
背景情况:
- 自体主导性多囊性病 (ADPKD) 是由于 PKD1 基因的突变引起的,该基因编码为多囊素-1 (PC1).
- PC1是一种非典型的GPCR,具有自催化GAIN域,分裂成N端 (NTF) 和C端 (CTF) 片段.
- PC1 CTF 信号由一个茎绑定激动剂 (TA) 调节,这是粘附GPCRs中独特的机制.
研究的目的:
- 为了研究 PC1 CTF 激活由茎衍生的的机制.
- 阐明茎结合和信号重新激活的分子基础.
- 探索针对PC1治疗ADPKD的治疗潜力.
主要方法:
- 利用高斯加速分子动力学 (GaMD) 和一种新的 GaMD (Pep-GaMD) 算法.
- 使用PC1茎TA衍生的合成 (p9,p17,p21) 进行细胞信号测试.
- 采用了突变发生,序列共变分析和结构动态模拟.
主要成果:
- 合成茎 (p9,p17,p21) 在没有茎的PC1 CTF突变体中重新激活了信号传导.
- 佩普-GaMD模拟显示了特定的结合区域和PC1 CTF的中间不活跃状态.
- 对TOP域的结合诱导了TOP-假定孔环相互作用,这对于PC1 CTF激活至关重要.
结论:
- 结构动态洞察力揭示了由茎衍生的激剂激活PC1的机制.
- 这些发现验证了PC1 CTF信号激活通路和激动剂相互作用.
- 这项工作为开发PC1作为ADPKD的治疗点提供了基础.
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