戈尔吉综合体中最多的水箱:用于分类分泌和血膜蛋白的容器
L Orci1, M Ravazzola, M Amherdt
1Institute of Histology and Embrology, University of Geneva, Switzerland.
Cell
|December 24, 1987
概括
研究人员使用免疫电子显微镜追踪了胰岛素和血蛋白质的路径. 他们发现,蛋白质分类发生在戈尔吉装置的最多的水箱中,将受调和构成性途径分开.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 贩卖蛋白质 贩卖蛋白质 是一个问题.
背景情况:
- 蛋白质进入受调节或构成性途径的细胞内分类机制在很大程度上仍未被阐明.
- 了解这些通路对于细胞功能和疾病研究至关重要.
研究的目的:
- 为了确定蛋白质被分类成受调节 (如胰岛素) 和构成性 (如血凝素) 分泌通路的细胞内部位.
- 为了可视化和区分细胞内这两种不同的蛋白质的运输路径.
主要方法:
- 使用免疫电子显微镜来追踪胰岛素和血凝素的定位和运动.
- 对细胞进行了分析,以观察两种蛋白质在戈尔基堆和随后的运输囊泡中的分布.
主要成果:
- 发现胰岛素和血凝素都在戈尔吉水箱中随机分布.
- 在戈尔吉外,胰岛素局部存在于密集核心的分泌颗粒中,而血凝素则存在于透明囊泡中.
- 携带血凝素的透明囊泡没有显示显著的内细胞标记,这表明它们是外细胞载体.
结论:
- 蛋白质分类成受调和构成性通路发生在高尔基器官的克拉特林涂层,跨大多数水箱.
- 这种分歧点是亲胰岛素包装开始的地方,将其与用于构成分泌的蛋白质 (如血凝素) 分开.
相关概念视频
Golgi Apparatus
As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.The Golgi apparatus is a major sorting and dispatch station for the products of the ER. Newly arriving vesicles enter...
Vesicular Tubular Clusters
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...
Golgi Apparatus
Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
Golgi Matrix Proteins
Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
Transport Across the Golgi
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...
Golgi Apparatus
Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...
The Golgi apparatus is a eukaryotic organelle that has a distinctive ribbon-like appearance. It is a primary sorting and dispatch station for cargo arriving from the ER. Newly arriving vesicles enter the cis face of the Golgi, closest to the ER, and are...


