在生物模拟粘附中,E-cadherin ectodomains的推拉机制
Kartikeya Nagendra1, Adrien Izzet2, Nicolas B Judd2
1Center for Soft Matter Research, Department of Physics, New York University, New York, New York; Molecular Biophysics and Biochemistry Training Program, NYU Grossman School of Medicine, New York, New York.
Biophysical journal
|August 2, 2023
概括
这是E-cadherin.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 分子动力学分子动力学
背景情况:
- 乙素通过细胞外域相互作用和细胞内素-细胞骨连接来调解细胞-细胞粘附.
- 粘合强度是由细胞外力和细胞内元件调节的,具有需要详细表征的应力诱导强化机制.
研究的目的:
- 量化阐明了在机械感知中cadherin ectodomain的作用.
- 为了研究底层的分子机制,紧张介导加强细胞-细胞粘附.
主要方法:
- 开发一种E-cadherin涂层的乳液系统,以平衡滴滴表面张力与蛋白质结合强度.
- 使用离心法进行E-cadherin的转结合和高蛋白表面度以实现cis增强的接口稳定.
- 采用"cis突变体"来破坏侧向cis相互作用,并分析其对粘附的影响.
主要成果:
- 观察到一种突然的度依赖于恒定晶体密度的粘附,类似于第一阶段过渡.
- 干扰 cis 相互作用转移过渡到更高的表面密度,导致更密,但较弱的粘合.
- 较大的变形区域的稳定与单分子实验相关,这些实验显示卡德林ectodomain的强度依赖寿命增强.
结论:
- E-cadherin ectodomain在机械感知中发挥着关键作用,跨和 cis 相互作用都影响着粘附稳定性.
- 晶体交互有助于粘附强化,而强度依赖的域外特征,可能通过"X-维度"键,增强在张力下的稳定性.
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