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相关概念视频

Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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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...
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Positive Regulator Molecules02:39

Positive Regulator Molecules

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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.
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Anaphase Promoting Complex00:50

Anaphase Promoting Complex

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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...
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M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

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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...
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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Microtubule Instability02:17

Microtubule Instability

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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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相关实验视频

Updated: May 17, 2025

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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对CDK4/6-CyclinD1复合物的稳定性进行动态洞察,该稳定性由abemaciclib调制.

Yuqing Zhao1, Chen Zhuo1, Haoquan Liu1

  • 1Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, 430079, China. yjzhaowh@ccnu.edu.cn.

Physical chemistry chemical physics : PCCP
|May 16, 2025
PubMed
概括

阿贝马西克利布破坏了CDK4-CyclinD1-P21复合体,其中P21与CDK4的结合比CDK6.6更强. 这一发现提高了对癌症治疗中CDK4/6抑制剂的理解.

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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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相关实验视频

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Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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科学领域:

  • 分子生物学分子生物学
  • 癌症研究 癌症研究
  • 药理学 药理学是指药理学的学科.

背景情况:

  • CDK4/6-CyclinD1复合体调节细胞循环,并与癌症有关.
  • P21和P27对于细胞周期G1/S过渡至关重要.
  • 阿贝马西克利布是一种CDK4/6抑制剂,但其对复合体稳定性的确切影响尚未完全理解.

研究的目的:

  • 研究abemaciclib对CDK4/6-CyclinD1-P21/P27复合物的稳定性的影响.
  • 为了阐明P21在abemaciclib的存在下与CDK4和CDK6的结合机制和亲缘关系.
  • 在CDK4/6中确定参与abemaciclib作用机制的特定区域.

主要方法:

  • 分子动力学 (MD) 模拟.分子动力学 (MD) 模拟.
  • 分析残留物分解的方法.
  • 相对交互网络 (RIN) 的分析.
  • 产生CDK4C端突变的基因.

主要成果:

  • 与CDK6相比,P21对CDK4具有较高的结合亲和力,涉及更广泛的残留物.
  • 在CDK4-CyclinD1-P21复合体内,Abemaciclib会破坏CDK4的C-叶区.
  • 一种CDK4C端突变选择性调节了abemaciclib对P21结合亲和力的作用.

结论:

  • 阿贝马西克利布的机制涉及通过非催化区域破坏CDK4-CyclinD1-P21复合物的稳定性.
  • 这些发现提高了对第二代CDK4/6抑制剂的理解.
  • 未来的抑制剂可能会进一步破坏含有CDK6和P27的复合体的稳定,以提高癌症治疗的疗效.