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Updated: Jul 13, 2025

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在使用3D spt-PALM观察到的活大肠杆菌细胞中,BAM和SecYEG复合物的扩散速度同样缓慢

Stephen Lee Upton¹, Jian Wei Tay², Daniel Keith Schwartz³

¹Department of Biochemistry, University of Colorado Boulder, Boulder, Colorado.

Biophysical journal

|October 19, 2023

概括

这项研究揭示了β-桶组装机械 (BAM) 和SecYEG复合体在大肠杆菌中如何相互作用. 这就是BAMA BAMA.

科学领域:

* 细胞生物学细胞生物学
* 蛋白质生物发生.
* 微生物学微生物学

背景情况:

* β-桶组装机械 (BAM) 综合体将外膜蛋白 (OMP) 插入大肠杆菌中.
*SecYEG转位器处理内膜蛋白的插入和周等离子体转位.
*新出现的证据表明SecYEG在OMP生物发生过程中与BAM的POTRA域相互作用.

研究的目的:

* 在活体大肠杆菌中研究BAM和SecYEG成分的扩散动态.
* 为了比较Bama和Sece与其他膜蛋白的移动性.
*阐明BAMA的POTRA域在复杂的组装和功能中的作用.

主要方法:

*可光激活的超分辨率定位显微镜 (PA-SRLM).
* 单颗粒追踪 (SPT) 在活体大肠杆菌中.
*使用双螺旋点传播函数 (DH-PSF) 显微镜进行三维追踪.

主要成果:

*Bamma结构表现出不动性,而OmpLA表现出缓慢的扩散,与外膜粘度一致.
*Bamma的POTRA域定了该复合体,但删除增加了移动性,表明它们在细胞相互作用中的作用.
*SecE扩散速度比PgpB慢,但与OMPs相似;在POTRA域删除后,SecE移动性增加.

结论:

*巴马的POTRA域对于定BAM综合体至关重要.
*SecE的移动性受到与BAM的相互作用的影响.
*结果支持E. coli*中一个跨周周等离子体BAM-SecYEG组合模型.

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