SRC-3协作激活器的功能寿命由酸依赖的无处不在的时钟调节
Ray-Chang Wu1, Qin Feng, David M Lonard
1Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
Cell
|June 19, 2007
概括
调节的SRC-3 (类固醇受体辅激剂-3) 的无处不在控制其激活和降解. 这种依赖酸化的过程起到"转录时间钟"的作用,平衡协激活器功能并防止瘤发生.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 癌症研究 癌症研究
背景情况:
- SRC-3 (类固醇受体辅激剂-3)/AIB1是一种关键的生长辅激剂,在过度激活时与瘤发生有关.
- 严格调节SRC-3活动对于正常细胞功能和防止不受控制的生长至关重要.
研究的目的:
- 阐明调控SRC-3协激活剂激活和转录特异性的调控机制.
- 调查酸化依赖的无化在控制SRC-3功能和稳定性的作用.
主要方法:
- 在SRC-3中确定一个关键的"actron/degron"元素.
- 描述GSK3作为负责任的激酶和SCF ((Fbw7alpha) 作为E3无酸酶.
- 分析SRC-3无处置模式 (多/单无处置与多无处置) 以及它们的功能后果.
主要成果:
- 发现了一种依赖酸化的泛化通路,调节SRC-3.
- 在这个监管级联中确定了GSK3和SCF (Fbw7alpha).
- 证明SCF ((Fbw7alpha) 调解了SRC-3的非蛋白质分解活性和蛋白质酶体降解.
- 观察到一个双相的无处不在化过程从激活过渡到降解,作为一个"转录时间钟".
结论:
- 协调的酸化和无处不在的化严格调节SRC-3的活性和寿命.
- SRC-3无处可见化是一种双相事件,控制着同活性剂的激活和降解.
- 这种调节机制确保了对转录协激活的精确控制,并防止了瘤性过度激活.
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.
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Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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...
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...


