对COPII外衣尺寸和功能的乌比奎丁依赖调节
Lingyan Jin1, Kanika Bajaj Pahuja, Katherine E Wickliffe
1Department of Molecular and Cell Biology, University of California at Berkeley, California 94720, USA.
Nature
|February 24, 2012
概括
乌比基酸酶CUL3-KLHL12单双基酸盐SEC31,使得像原蛋白这样的重货物可以有更大的COPII囊层. 这一发现解释了COPII囊泡大小是如何调节有效的蛋白质分泌的.
科学领域:
- 细胞生物学 细胞生物学
- 分子和细胞生物学分子和细胞生物学.
- 生物化学 生物化学
背景情况:
- 通过COPII囊泡从内质网膜输送蛋白质对于细胞分泌至关重要.
- 大多数COPII囊泡都是60-80纳米,但对于大容量货物 (例如,公原纤维,基洛米克龙) 需要更大的.
- 在COPII囊泡形成的缺陷导致疾病,如原沉积障碍和胆米克朗保留疾病.
研究的目的:
- 阐明控制COPII囊泡大小的机制.
- 确定COPII外套组装和货物特定运输的监管机构.
主要方法:
- 研究了在COPII囊泡形成中泛素酶CUL3-KLHL12的作用.
- 分析了COPII组件SEC31.1.的无处不在情况.
- 评估了CUL3-KLHL12对COPII外套尺寸和货物运输的影响.
主要成果:
- 确定了CUL3-KLHL12作为COPII层组装的关键调节器.
- 证明CUL3-KLHL12催化SEC31单双化,促进形成更大的COPII层.
- 表明CUL3-KLHL12介导的无处不在对于原体出口至关重要,但对于小型货物运输不那么重要.
结论:
- 通过CUL3-KLHL12的单双化控制COPII囊泡外衣大小.
- 这种机制允许各种货物的规范运输,从小蛋白质到大纤维.
- 研究结果提供了有关囊泡贩运和与蛋白质分泌缺陷相关的疾病病原体的见解.
相关概念视频
Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Coat Assembly and GTPases
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...
Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
Covalently Linked Protein Regulators
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.
Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...


