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Contenido archivado el 2024-05-27

Junb degradation in mitosis

Objetivo

JunB belongs to the family of AP-l transcription factors, some of which have been shown to play a critical role in the development of a variety of neoplasia. JunB is a negative regulator of cell proliferation which has recently been shown to have a tumor supressor activity in vivo. It is a metabolically unstable protein whose degradation is dramatically accelerated upon phosphorylation, most probably by the cyclinB/cdc2 kinase, in mitosis. JunB is an antagonist of c-Jun, another member of the AP-l family involved in the positive control of important cell cycle Regulators such as cyclin Dl. Consequently, it is believed that its destruction in mitosis is necessary for optimum activity of c-Jun during the Gl phase and proper progression from Gl to S phase in response to mitogenic activation. The molecular basis of the variations in JunB abundance during the cell cycle are still ill-defined. It is Therefore essential to elucidate how JunB is degraded for understanding its physiological functions but also because the cells components participating to its destruction are potential oncogenes since unphysiological degradation is a potential loss of function mechanism. Using a variety of molecular and cellular approaches, I thus propose to decipher the intimate mechanisms whereby JunB is degraded during mitosis with a particular attention to the ubiquitin/proteasome system. I will also investigate the precise timing of JunB degradation in M phase with recently developed microscopic techniques. Together with the development of the degradation-resistant mutants, these experiments will provided an experimental basis for determining whether JunB degradation in mitosis is necessary for proper progression through the cell cycle.

Ámbito científico (EuroSciVoc)

Programa(s)

Tema(s)

Datos no disponibles

Convocatoria de propuestas

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Régimen de financiación

RGI - Research grants (individual fellowships)

Coordinador

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Aportación de la UE
Sin datos
Dirección
Route de Mende 1919
34293 MONTPELLIER
Francia
Coste total
Sin datos