27可通过代激活依赖于环素的激酶4并对抗帕尔博西克利布的抑制
Keelan Z Guiley1,2, Jack W Stevenson2, Kevin Lou2
1Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA.
概括
化p27蛋白激活CDK4,促进细胞增殖. 这种激活的复合物对药物palbociclib具有抗药性,该药物向非活性CDK4/6,揭示了癌症的新机制.
科学领域:
- 分子生物学
- 细胞循环调节
- 癌症治疗方法
背景情况:
- p27蛋白通常抑制循环蛋白依赖性激酶 (CDKs),以控制细胞增殖.
- 通过p27与活性CDK4结合的机制尚不清楚.
- 了解CDK调节对于癌症治疗至关重要.
研究的目的:
- 通过p27阐明CDK4激活的机制.
- 研究p27酸化的结构和功能后果.
- 确定p27-CDK4复合体对CDK4/6抑制剂的敏感性.
主要方法:
- 使用氨酸激酶进行蛋白质酸化试验.
- 蛋白质复合物的结构分析.
- 用于测量酶活性的生物化学测试.
- 使用palbociclib进行药物敏感性测试.
主要成果:
- 化p27 (phosp27) 在复合中与cyclin D1 (CDK4- CycD1) 一起化激活CDK4.
- 27结合改变了CDK4的活性部位,增强了像视网膜母细胞蛋白 (Rb) 这样的基质的酸化.
- 27-CDK4-CycD1复合物对palbociclib不敏感,而该药物针对单体CDK4/ 6.
结论:
- 化p27形成一个具有独特调节性质的活性Rb激酶复合体 (phosp27-CDK4-CycD1).
- 这种复合体代表了一种新型的,耐药的CDK4/ 6活性.
- 这些发现表明针对癌症中抗性CDK4/ 6复合物的新治疗策略.
更多相关视频
相关概念视频
Inhibition of Cdk Activity
5.5K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
5.5K
Negative Regulator Molecules
38.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.1K
Positive Regulator Molecules
6.4K
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.
6.4K
Positive Regulator Molecules
133.4K
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
133.4K
Anaphase Promoting Complex
3.3K
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...
3.3K
Interactions Between Signaling Pathways
7.1K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
7.1K


