TBC1D20协调囊泡运输和actin重塑,以调节纤维生成
Denghui Zhai1, Lamei Li1, Difei Wang1
1Department of Genetics and Cell Biology, College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, China.
The Journal of cell biology
|January 27, 2025
概括
TBC1D20蛋白质缺乏导致华堡微症候群. 我们的研究表明,TBC1D20通过协调Rab11囊泡运输和actin重塑来调节纤维生成,为疾病机制提供了洞察力.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 华堡微症候群 (WMS) 是一种与TBC1D20缺乏相关的遗传疾病,呈现出严重的发育异常.
- 精确的分子基础的WMS病原和TBC1D20的细胞功能仍然在很大程度上未被阐明.
研究的目的:
- 为了确定TBC1D20在细胞过程中的分子功能.
- 阐明TBC1D20在调节纤维生成中的作用及其与WMS的联系.
主要方法:
- 利用基于细胞的测试来研究TBC1D20的功能.
- 采用了分析Rab11 GTPase活性,囊泡贩运和actin动态的技术.
- 检查了涉及TBC1D20,Rab11和MICAL1.1的蛋白质与蛋白质相互作用.
主要成果:
- 确定了TBC1D20作为一种新的Rab11 GTPase激活蛋白 (GAP).
- 证明TBC1D20的枯竭导致Rab11囊泡的积累和中心体上的actin解构.
- 表明TBC1D20的损失增强了Rab11-MICAL1相互作用,促进了F-actin脱聚合,并促进了纤维生成的启动.
结论:
- TBC1D20是通过Rab11介导的囊泡运输和actin重塑的早期纤维生成的关键调节者.
- 干扰TBC1D20功能会损害协调的纤毛发育,提供了对沃堡微型综合征的机制性见解.
- 这些发现突出了TBC1D20在纤毛发育中的时空调节及其在人类疾病中的意义.
相关概念视频
Vesicular Tubular Clusters
2.4K
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...
2.4K
Transport Across the Golgi
4.0K
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...
4.0K
Coat Assembly and GTPases
3.5K
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...
3.5K
Pinching-off of Coated Vesicles
3.1K
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...
3.1K
Clathrin Coated Vesicles
6.8K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
6.8K
Cell Motility through Blebbing
1.9K
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
1.9K


