在细菌外膜接口上的脂运输的分子机制
Jiang Yeow1, Min Luo2,3, Shu-Sin Chng4,5
1Department of Chemistry, Faculty of Science, National University of Singapore, Singapore, 117543, Singapore.
OmpC-Mla系统通过运输错位的脂物来维持细菌外膜的完整性. 这项研究揭示了MlaA和MlaC如何相互作用,以促进这一关键的脂质运输过程.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 格拉姆阴性细菌具有具有基本脂质不对称的外膜 (OM).
- 这种OM屏障可以保护人免受有害的外部因素,如抗生素和胆汁盐.
- OmpC-Mla系统对于将错位化脂 (PLs) 从OM外在说明书中去除至关重要.
研究的目的:
- 阐明脂运输中的OmpC-Mla系统的机械细节.
- 在生物化学和结构上表征过渡性MlaA-MlaC复合体.
- 了解MlaA如何与MlaC相互作用,以实现高效的PL转移.
主要方法:
- 生物化学测定用于绘制MlaA和MlaC之间的相互作用表面.
- 使用冷电子显微镜 (cryo-EM) 对二硫化物捕获复合物的结构分析.
- 实验室研究调查MlaC招募到OM和MlaA的形状变化.
主要成果:
- 确定了驱动MlaC向OM招募的关键静电相互作用.
- 证明MlaC结合调节了MlaA的结构状态.
- 确定了OmpC-MlaA-MlaC复合体的2.9年冷-EM结构,揭示了对脂质运输的结构洞察力.
结论:
- OmpC-Mla系统使用特定的静电相互作用来有效地招募MlaC.
- 对于逆行PL传输,MlaA通过MlaC的形态调制至关重要.
- 膜稀释被提议作为一种机制,以促进脂质的输送运输,保持OM脂质不对称.
更多相关视频
10:24Separation of the Cell Envelope for Gram-negative Bacteria into Inner and Outer Membrane Fractions with Technical Adjustments for Acinetobacter baumannii
Published on: April 10, 2020
09:54Multifunctional, Micropipette-based Method for Incorporation And Stimulation of Bacterial Mechanosensitive Ion Channels in Droplet Interface Bilayers
Published on: November 19, 2015
相关概念视频
Assembly of the Lipid Bilayer in the ER
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
Asymmetric Lipid Bilayer
Phosphoinositides and PIPs
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Membrane Asymmetry Regulating Transporters
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Cellular Membranes and Drug Transport
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.
ABC Transporters: Importer
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
