酵母自膜的边缘孔径平衡了货物包含与囊泡成熟的情况
Oren Shatz1, Milana Fraiberg1, Damilola Isola1
1Departments of Biomolecular Sciences, The Weizmann Institute of Science, 76100 Rehovot, Israel.
Developmental cell
|March 6, 2024
概括
自自是一种自的过程.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 自是一种通过 lysosomes 降解细胞质组分的细胞过程.
- 非选择性自会使用扩展隔离膜 (IM) 来隔离散装货物.
- IM扩张和货物扣押的机制尚不清楚.
研究的目的:
- 阐明在非选择性自过程中调节隔离膜 (IM) 扩张的机制.
- 了解IM如何保持对货物扣留和及时成熟的开放性.
- 研究特定蛋白质复合体和酸在自中所起的作用.
主要方法:
- 使用了芽生长酵母Saccharomyces cerevisiae作为一个模型生物体.
- 研究了IM边缘蛋白质复合体的空间组合和功能.
- 分析了氏酸3- (PI(3) P) 在调节膜动态中的作用.
主要成果:
- 鉴定了一种Atg24/Snx4-Atg20/Snx41复合体,该复合体聚集在IM边缘,依赖于自PI.
- 这种复合物稳定了开放的IM边缘,在囊泡扩张过程中促进了大型货物的扣留.
- Atg2-Atg18复合体和Ymr1调节轮收缩和PI(3) P清除,促进成熟和小货物的消耗.
结论:
- 自性PI(3) P严格调节IM边缘的孔径.
- 这种规则将IM扩张的机制与非选择性自的生理要求相结合.
- 边缘开放和收缩之间的平衡决定了货物的选择性和自细胞成熟.
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