Video Experimental Relacionado
Updated: Aug 9, 2026
10:54
Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
Desfosforilación y activación de un complejo p34cdc2/ciclina B in vitro por la proteína CDC25 humana
U Strausfeld1, J C Labbé, D Fesquet
1CNRS and INSERM, BP 5051, Montpellier, France.
Nature
|May 16, 1991
Resumen
Los investigadores identificaron una proteína clave que activa la división celular. La proteína CDC25 humana desfosforila y activa el complejo p34cdc2 / ciclina B, promoviendo la transición del ciclo celular de la fase G2 a la fase M.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- Detención de los ovocitos en la fase G2 con un complejo p34cdc2 / ciclina B inactivo.
- Este complejo es inactivado por fosforilación en p34cdc2.2.
- La fosfatasa que regula esto es desconocida, pero CDC25 es un probable activador.
Objetivo del estudio:
- Investigar el papel de CDC25 en la activación del complejo p34cdc2 / ciclina B.
- Para determinar si el CDC25 humano puede activar el complejo in vitro.
Principales métodos:
- Purificación del complejo inactivo p34cdc2/ciclina B a partir de ovocitos de estrellas de mar.
- Ensayos in vitro utilizando bacterias humanas purificadas y expresadas p54CDC25H.
Principales resultados:
- La adición de p54CDC25H desencadenó la desfosforilación de p34cdc2.
- p54CDC25H activó la actividad de la histona quinasa H1 del complejo.
Conclusiones:
- El producto del gen cdc25+ activa directamente el complejo p34cdc2-ciclina B.
- El p54CDC25H humano puede activar funcionalmente el óvulo de estrella de mar p34cdc2-ciclina B complejo.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
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...
02:17Separation 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...
02:34Inhibition 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...