通过CDC42对戈尔基的双向COPI运输的协调监管
Seung-Yeol Park1, Jia-Shu Yang1, Angela B Schmider2
11] Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA [2] Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|May 7, 2015
概括
毛皮蛋白I (COPI) 复合体将蛋白质分类成戈尔吉管,补充水槽成熟. CDC42调节了这种运输和膜曲率,这对于细胞蛋白质分类至关重要.
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:
- 戈尔吉综合体对于分类分泌蛋白质至关重要.
- 储成熟模型解释了戈尔吉运输,但不完整.
- 连接戈尔吉水箱的管道是了解运输的关键.
研究的目的:
- 为了研究外套蛋白I (COPI) 在前级戈尔吉运输中的作用.
- 为了阐明小GTPase CDC42在戈尔吉动态中的功能.
- 了解COPI管道运输如何补充水箱成熟.
主要方法:
- 人类细胞培养人类细胞培养
- 蛋白质复合体分析分析
- 测试GTPase活动的测试.
- 膜曲率研究研究的研究.
主要成果:
- COPI复合物将级载荷分类到人体细胞中的戈尔吉管道中.
- CDC42规范了COPI在货物分类和航母组成方面的双重功能.
- CDC42直接诱导膜曲,促进COPI管道的形成.
- COPI管道运输补充了 Golgi 前级运输的水箱成熟.
结论:
- 通过COPI介导的管道运输是前进的戈尔吉运输的重要机制.
- CDC42在通过COPI调节双向Golgi运输方面发挥着至关重要的作用.
- 环境线索通过CDC42调节COPI传输,突出了动态的戈尔吉功能.
相关概念视频
COP Coated Vesicles
18.7K
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
18.7K
Coat Assembly and GTPases
4.8K
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
4.8K
Transport Across the Golgi
6.7K
While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
6.7K
Rab Cascades
3.8K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
3.8K
Vesicular Tubular Clusters
3.4K
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
3.4K
Pinching-off of Coated Vesicles
4.5K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
4.5K


