结构功能分析表明,光受体LITE-1是一种光激活的离子通道
Sonya M Hanson1, Jan Scholüke2, Jana Liewald2
1Center for Computational Biology and Center for Computational Mathematics, Flatiron Institute, Simons Foundation, 162 5th Avenue, New York, NY 10010, USA; Department of Theoretical Biophysics, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt, Germany.
线虫LITE-1蛋白质使用型和染色体检测光,作为光子和H2O2巧合探测器来控制离子通道的逃逸行为.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 光感觉对于生物的生存至关重要.
- 线虫Caenorhabditis elegans使用光传感器LITE-1进行紫外线和蓝光检测,触发逃生反应.
- 通过必要的托残留物,LITE-1有效吸收紫外线光子.
研究的目的:
- 用计算和实验方法建模LITE-1的结构和动态.
- 描述LITE-1的功能,包括光吸收,通道封闭和光氧化机制.
- 为了确定染色体结合点,并了解光子诱导的信号通路.
主要方法:
- AlphaFold2-多元建模和分子动力学 (MD) 模拟.
- 在C. elegans.中进行突变和行为分析.
- 电生理学记录以评估LITE-1作为光子和H2O2探测器的功能.
主要成果:
- LITE-1的结构类似于昆虫的嗅觉和味觉受体,作为四重体离子通道起作用.
- 确定了通道封闭,光吸收和光氧化的主要残留物,包括潜在的PRDX-2结合点.
- 发现了一个染色体结合口袋,其中有一个关键的氨酸附着部位,阐明了光子诱导的构造变化和通道封锁机制.
结论:
- LITE-1 作为一个光子和过氧化 (H2O2) 巧合探测器.
- 蛋白质折叠和组装,类似于昆虫化学受体,可能已经演变为光激活的离子通道.
- 相关的蛋白质,如C. elegans GUR-3,可能使用类似的光子检测机制.
更多相关视频
10:03Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
11:24Preparation of Living Isolated Vertebrate Photoreceptor Cells for Fluorescence Imaging
Published on: June 22, 2011
相关概念视频
Channel Rhodopsins
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
G-Protein Gated Ion Channels
Sensory...
Photoreceptors and Visual Pathways
Ligand-Gated Ion Channel Receptor: Gating Mechanism
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...
Mechanically-gated Ion Channels
