Video Experimental Relacionado
Updated: Aug 14, 2026
10:54
Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
La quinasa Cdc2 fosforila directamente la proteína de la matriz cis-Golgi GM130 y es requerida para la fragmentación
M Lowe1, C Rabouille, N Nakamura
1Cell Biology Laboratory, Imperial Cancer Research Fund, London, United Kingdom.
Cell
|September 30, 1998
Resumen
La fragmentación mitótica de Golgi es impulsada por la cinasa Cdc2 que fosforila GM130 en Ser-25, interrumpiendo la unión de p115. Este proceso no requiere la vía de la quinasa MEK1 MAP.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La fragmentación del Golgi mitótico es un evento clave durante la división celular.
- Se cree que la interrupción de la interacción entre GM130 y p115 impulsa la fragmentación de Golgi.
- Los mecanismos moleculares precisos y las vías de señalización involucradas siguen siendo incompletamente entendidos.
Objetivo del estudio:
- Para identificar el sitio específico de quinasa y fosforilación responsable de la interrupción de GM130 durante la mitosis.
- Para investigar el papel de la vía de la kinasa MEK1-MAP en la fragmentación mitótica de Golgi.
Principales métodos:
- Pruebas de kinasa in vitro para identificar la kinasa responsable.
- Mutagénesis dirigida al sitio para identificar el sitio clave de fosforilación en GM130.0.
- Experimentos in vitro e in vivo para evaluar la necesidad de MEK1.
Principales resultados:
- La serina-25 (Ser-25) de GM130 fue identificada como el sitio crítico de fosforilación.
- La quinasa Cdc2 fue identificada como la enzima responsable de la fosforilación de GM130 en Ser-25.
- Se descubrió que MEK1 no es necesario para la fosforilación de GM130 o la fragmentación de Golgi.
Conclusiones:
- Cdc2 directamente fosforila GM130 en el Ser-25, lo que lleva a la fragmentación de Golgi.
- La vía de la kinasa MEK1-MAP no es esencial para la fragmentación mitótica de Golgi.
- Este estudio aclara la participación directa de la quinasa en un proceso fundamental de división celular.
Más Videos Relacionados
08:33Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
Published on: December 5, 2017
12:26Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Videos de Conceptos Relacionados
01:12Golgi Matrix Proteins
Golgi matrix proteins are a group of highly dynamic proteins that maintain the stacked structure of Golgi. These proteins adapt to rapid morphological changes of the Golgi during the cell cycle. During cell division, mild proteolysis removes these connections resulting in Golgi unstacking. In The daughter cells, these proteins help reassemble the unstacked Golgi.
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
One of the first identified Golgi matrix proteins was GM130, a rod-like protein located in the cis-Golgi. Subsequently, many Golgi...
02:15M-Cdk Drives Transition Into Mitosis
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...
02:17Separation of Sister Chromatids
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...
At the onset of anaphase, separase, a proteolytic enzyme, is...
00:50Anaphase Promoting Complex
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...
02:15M-Cdk Drives Transition Into Mitosis
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...
00:50Anaphase Promoting Complex
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...