2+传感器ALG-2使用ESCRT来增强 lysosomal膜对透应激的弹性
bioRxiv : the preprint server for biology
|February 14, 2024
概括
细胞通过通过感应蛋白ALG-2来招募ESCRT蛋白质来保护溶解体免受透应激. 这种机制增强了溶酶体膜的弹性,并防止破裂,突出了ESCRT在维护器官完整性方面的预防作用.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 膜生物学 膜生物学
背景情况:
- 溶解体对于细胞代谢和代谢调节至关重要.
- lysosomal膜损伤可以释放有毒的内容,危及细胞功能.
- 了解细胞对 lysosomal 压力的反应对于细胞健康至关重要.
研究的目的:
- 为了研究细胞对溶解体中透应激的反应.
- 阐明 (Ca2+) 在溶酶体膜完整性中的作用.
- 确定ESCRT蛋白和ALG-2在溶酶体应激反应中的参与.
主要方法:
- 利用甘氨酸-L-氨酸2-纳胺 (GPN) 诱导 lysosomes 的透应激.
- 使用敏感检测方法测试了溶酶体泄漏和破裂.
- 采用BAPTA合细胞质Ca2+并观察到对溶酶体稳定性的影响.
- 研究了亡相关基因-2 (ALG-2) 和ESCRT蛋白质对溶酶体的招募.
- 激活了TRPML1通道以产生局部化的Ca2+信号并评估它们的保护作用.
主要成果:
- 由GPN诱导的透应激触发了溶解体中广泛的Ca2+释放.
- 化细胞质Ca2+增加了溶酶体对破裂的敏感性.
- Ca2+信号将Ca2+敏感蛋白ALG-2和ESCRT蛋白招募到溶解体中.
- 招募ALG-2和ESCRT增强了对透应激和药物诱导损伤的溶解体抵抗力.
- 激活TRPML1会产生Ca2+信号,通过招募ALG-2和ESCRT来保护溶解体.
结论:
- 由ALG-2介导的Ca2+信号,将ESCRT招募到溶解体中,增强了对透应激的膜稳定性.
- 这项研究揭示了ESCRT机械在保护 lysosomes 免受压力诱导的膜损伤方面的预防作用.
- 细胞拥有积极保护溶解体的机制,而不是仅仅在损伤后修复它们.
相关概念视频
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
01:11Channel Rhodopsins
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
01:19Other Algae
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
01:17Microbial Biosensors
Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...