Video Experimental Relacionado
Updated: Jul 27, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
La unión regulada por el ciclo celular de la c-Abl tirosina quinasa al ADN
1Department of Biology, University of California San Diego, La Jolla 92093-0116.
Science (New York, N.Y.)
|April 17, 1992
Resumen
El proto-oncogeno c-Abl proteína tirosina quinasa se une al ADN a través de su dominio carboxilo-terminal. Esta unión al ADN es crucial para la función c-Abl y se pierde durante la mitosis debido a la fosforilación.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La oncogénesis es la oncogénesis.
Sus antecedentes:
- El proto-oncogén c-Abl codifica una proteína tirosina quinasa con localización citoplasmática y nuclear.
- c-Abl juega un papel en los procesos celulares, pero sus funciones precisas, en particular las funciones nucleares, requieren una mayor aclaración.
- Comprender la regulación de la actividad de c-Abl es fundamental para comprender su participación en el desarrollo del cáncer.
Objetivo del estudio:
- Para investigar la capacidad de unión al ADN de la proteína c-Abl tirosina quinasa.
- Determinar el papel del dominio carboxilo-terminal en la asociación de c-Abl con la cromatina.
- Explorar la regulación de la actividad de unión al ADN de c-Abl durante el ciclo celular, específicamente la mitosis.
Principales métodos:
- Pruebas bioquímicas para identificar el dominio de unión al ADN dentro de la proteína c-Abl.
- Estudios de asociación de cromatina para confirmar la interacción de c-Abl con el ADN.
- Ensayos de kinasa in vitro utilizando la cinasa cdc2 para estudiar el efecto de la fosforilación en la actividad de unión al ADN.
- Análisis de ratones mutantes que carecen del dominio de unión al ADN c-Abl.
Principales resultados:
- El segmento carboxilo-terminal de c-Abl contiene un dominio de unión al ADN esencial para la asociación de la cromatina.
- La actividad de unión al ADN de c-Abl se elimina durante la mitosis después de la fosforilación del segmento carboxilo-terminal por la cinasa cdc2.
- Los ratones mutantes homocigotos que carecen del dominio de unión al ADN c-Abl exhiben defectos de desarrollo letales al nacer.
Conclusiones:
- El dominio de unión al ADN de c-Abl es crítico para sus funciones biológicas.
- La regulación de la unión del ADN c-Abl a través de la fosforilación durante la mitosis es un mecanismo clave que controla su actividad.
- La interacción de c-Abl con el ADN es esencial para el desarrollo normal y la supervivencia.
Videos de Conceptos Relacionados
01:23Negative Regulator Molecules
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.
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:39Positive Regulator Molecules
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.
02:34Inhibition of Cdk Activity
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...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:34Inhibition of CDK Activity
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...