由电突触蛋白Connexin 36和ZO-1形成的低亲和性复合体的分子决定因素
bioRxiv : the preprint server for biology
|November 24, 2025
概括
研究人员确定了Connexin 36 (Cx36) 中的关键残留物,这些残留物调节了它与Zonula occludens蛋白1 (ZO-1) 的相互作用,揭示了调整电突触动态的机制.
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
- 生物物理学的生物物理.
背景情况:
- 电突触,就像化学突触一样,利用脚手架蛋白质来保持稳定.
- Zonula occludens蛋白1 (ZO-1) 通过PDZ域与Connexin 36 (Cx36) 相互作用,影响电突触调节.
- 这种相互作用很弱,这表明它在动态突触调制中起作用.
研究的目的:
- 确定特定的Cx36残留物,这些残留物对于与ZO-1的PDZ域的低亲和度结合至关重要.
- 为了研究Cx36的PDZ结合基因 (PBM) 和相邻的残留物的进化调整.
- 探索CaMKII介导酸化对ZO-1/Cx36相互作用的影响.
主要方法:
- 高斯加速分子动力学 (GaMD) 模拟.
- 在体外结合测定与工程Cx36突变体.
- 分析Cx36正方体和CaMKII酸化效应的分析.
主要成果:
- 在Cx36位置319的单个氨基酸替代显著增强ZO-1结合.
- 在Cx36和鱼类中相邻的酸性残留物削弱PDZ相互作用;替代物增加结合.
- 通过CaMKII介导的Cx36酸化破坏了ZO-1结合,这表明它在突触强化中的作用.
结论:
- Cx36残留物319对于调节ZO-1相互作用强度至关重要.
- 进化压力已经调整了Cx36 PBM和相邻区域,以微调PDZ相互作用.
- 通过突变或酸化调节ZO-1/Cx36结合,有可能控制电突触功能.
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