机器敏感通道YbiO的导电率相当于最大的封闭孔
Benjamin J Lane1, Mariangela Dionysopoulou2, Nana Yan2
1Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK; School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK; Aston Institute for Membrane Excellence, Aston University, Birmingham B4 7ET, UK.
细菌机械敏感通道,如YbiO,可以比以前想象的更广泛地开放,这表明细胞保护中的新角色. 这些通道作为细菌细胞的关键压力.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 微生物学 微生物学
背景情况:
- 细菌机械敏感通道 (MSCs) 保护细胞免受透应激.
- MscL和 MscS 类频道是关键家族,但像 YbiO 这样的更大的 MscS 类频道的作用尚不清楚.
- 之前的研究表明,与MscL相比,MscS类通道的导电能力较低.
研究的目的:
- 研究细菌通道YbiO的功能能力和结构基础.
- 为了确定YbiO是否表现出比以前报道的MscS类通道更大的导电量和孔隙开放.
- 探索YbiO和相关通道的潜在新生理作用.
主要方法:
- 电生理学用于测量通道导电.
- 低温电子显微镜 (cryo-EM) 用于确定YbiO的结构.
- 对道子状态和孔径尺寸的分析.
主要成果:
- YbiO 的电导率为 ~3 nS,与 MscL.L. 相当.
- 低温电磁显露出YbiO在一个半开放的形状,孔隙>25 Å.
- 确定了多个子状态,其中一个与观察到的毛孔开口相匹配,另一个类似于之前描述的全孔开口.
结论:
- YbiO具有惊人的大孔开放能力,挑战了关于MscS类通道的先前假设.
- 结构和功能数据表明YbiO具有新的生理功能.
- 对YbiO和其他MscS类通道的进一步研究可能会揭示细菌细胞调节的新机制.
更多相关视频
11:42Reconstitution of a Transmembrane Protein, the Voltage-gated Ion Channel, KvAP, into Giant Unilamellar Vesicles for Microscopy and Patch Clamp Studies
Published on: January 22, 2015
11:55Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
Published on: August 16, 2016
相关概念视频
Mechanically-gated Ion Channels
Non-gated Ion Channels
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Voltage-gated Ion Channels
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
Ion Channels
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ligand-gated Ion Channels
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Ligand-Gated Ion Channel Receptor: Gating Mechanism
