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一个B. B. B. B. Sec和Srp系统对蛋白质分泌的不同条件有动态的适应

Svenja M Fiedler¹, Peter L Graumann¹

¹Fachbereich Chemie und Zentrum für Synthetische Mikrobiologie, SYNMIKRO, Philipps-Universität Marburg, Hans-Meerwein Straße 4, 35043 Marburg, Germany.

|March 13, 2024

概括

在 Bacillus subtilis 中的 SecA 蛋白质动态与蛋白质分泌过程中与核糖体结合. SecA和信号识别粒子 (SRP) 系统在管理高蛋白质分泌需求方面表现出可塑性.

科学领域:

细胞生物学细胞生物学
蛋白质分泌机制蛋白质分泌机制
分子动力学分子动力学

背景情况:

SecA ATPase通过SecYEG转位孔驱动蛋白质分泌.
信号识别粒子 (SRP) 系统通过SecYEG插入膜蛋白.
了解SecA对基质的访问和应对Bacillus subtilis高表达的理解是有限的.

研究的目的:

在 Bacillus subtilis 中调查 SecA 局部化和动态.
确定SeCA在高水平蛋白质表达过程中如何处理增加的基质可用性.
分析分泌蛋白过度生产对SeCA和相关蛋白质动态的影响.

主要方法:

在Bacillus subtilis中单个分子跟踪.
在不同生长阶段 (指数式,过渡式,静止式) 分析蛋白质动态.
对SecA,SecDF,YidC和FtsY动态的比较分析,有和没有AmyE过度生产.

主要成果:

SecA局部化反映了核糖体的分布和动态,表明与信号的共同翻译关联.
SecA主要是一种移动细胞质蛋白,其中较小的一小部分与细胞膜静态相关.
在过渡生长阶段,SecA的动态发生显著变化,与高蛋白质分泌相关.
分泌蛋白AmyE的过度生产导致SRP组件FtsY的更静态的参与,但不是SecDF或YidC.
在高分泌蛋白负载期间,SRP通路的参与增加.

结论:

细菌细菌SecA与核糖体中的新生信号有关.
SecA和SRP系统具有显著的可塑性,以适应不同的蛋白质分泌要求.
当SecA通路过载时,SRP通路被招募来协助蛋白质分泌.

关键词:

艾米·艾米 (AmyE) 是一个很好的朋友.这种细菌是 Bacillus subtilis.在 FtsYY 里.格拉姆阳性细菌是什么?一个SecAA一个SecA 在SecDFDF中使用.在 YIDC 中,YIDC 是 YIDC.蛋白质分泌蛋白质分泌蛋白质分泌单个分子跟踪跟踪.

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