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PTEN的二维基提尼化和局部化由HAUSP-PML网络进行调节
Min Sup Song1, Leonardo Salmena, Arkaitz Carracedo
1Cancer Genetics Program, Beth Israel Deaconess Cancer Center and Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|August 22, 2008
概括
核PTEN (在染色体10中删除的酸酶和张素同类物) 的排除驱动癌症. 一个新的PML-DAXX-HAUSP网络控制PTEN二维基化和核入口,提供有关癌症进展的见解.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 核排除PTEN瘤抑制剂与癌症进展相关.
- 控制PTEN在人类癌症中异常局部化的机制尚不清楚.
- PTEN无处不在调节其核-细胞质分离.
研究的目的:
- 阐明控制PTEN在人类癌症中的亚细胞局部化的机制.
- 为了确定PTEN脱和核贩运的新型监管者.
- 调查PML-DAXX-HAUSP网络在PTEN细分和癌症中的作用.
主要方法:
- 研究了PTEN局部化与前列细胞白血病蛋白 (PML) 核体和疹病毒相关的全基因特异蛋白酶 (HAUSP/USP7) 相关.
- 使用针对PML-RARalpha降解的药物治疗 (全转网红酸,三氧化) 来评估对核PTEN的影响.
- 研究了PML,DAXX和HAUSP在控制PTEN脱和贩运方面的相互作用.
- 在人类前列腺癌样本中评估HAUSP表达和PTEN定位.
主要成果:
- 功能性PML核机构反对HAUSP对PTEN的活动,维持PTEN进入核.
- 由于乱的PML功能,PTEN在急性前兆细胞白血病中异常局部化.
- 降解PML的处理-RARalpha恢复了核PTEN的局部化.
- 通过适应蛋白DAXX,PML反对HAUSP的活动.
- 在前列腺癌中,HAUSP过度表达,与PTEN核排斥相关.
结论:
- 一个新的PML-DAXX-HAUSP分子网络调节了PTEN的脱和贩运.
- 这种网络因瘤性因素而受到干扰,有助于在癌症中排除PTEN核.
- 这项研究定义了PTEN亚细胞细分的新型二维基因化依赖模型.
- 针对这个网络可能为异常PTEN定位的癌症提供治疗策略.
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.
Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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...
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...
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...

