CRL4AMBRA1是D型环素的主要调节剂
Daniele Simoneschi1,2, Gergely Rona1,2,3, Nan Zhou4
1Department of Biochemistry and Molecular Pharmacology, NYU Grossman School of Medicine, New York, NY, USA.
Nature
|April 15, 2021
概括
研究人员确定CRL4AMBRA1是向D型环的泛素结合酶. 失去AMBRA1会导致循环蛋白积累和发育缺陷,突出AMBRA1
科学领域:
- 细胞生物学
- 分子瘤学
- 发育生物学
背景情况:
- D型环素是细胞循环的关键调节剂和常见的癌症点.
- 不完全了解D型环素的流通机制.
- D型环素的失调有助于瘤发生.
研究的目的:
- 确定负责D型环素降解的基酶.
- 研究AMBRA1在细胞循环调节和癌症中的作用.
- 阐明D型环素稳定性的机制及其在癌症治疗中的含义.
主要方法:
- 生物化学试验
- 在体细胞中进行遗传研究
- 通过CRISPR-Cas9进行查
- 发展和癌症的小鼠模型
主要成果:
- 已确定CRL4AMBRA1是向D型环素的降解酶.
- 失去Ambra1会导致D型环素积累,RB过化和发育缺陷.
- AMBRA1作为瘤抑制剂;低mRNA水平预测患者的生存率很低.
- D型循环素的癌症突变会破坏AMBRA1的结合并导致稳定.
- 通过促进D型环林/ CDK2复合体的形成,AMBRA1损失降低了对CDK4/ 6抑制剂的敏感性.
结论:
- AMBRA1通过CRL4AMBRA1泛素连接酶控制D型环素的稳定性.
- 在发育和癌症中,AMBRA1是RB途径的关键调节者.
- AMBRA1状态影响对CDK4/ 6抑制剂治疗的反应.
相关概念视频
Positive Regulator Molecules
117.0K
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
117.0K
Positive Regulator Molecules
6.0K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
6.0K
Master Transcription Regulators
7.3K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
7.3K
Master Transcription Regulators
2.5K
2.5K
Anaphase Promoting Complex
3.0K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
3.0K
M-Cdk Drives Transition Into Mitosis
5.9K
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
5.9K


