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Participación de una proteína fosfatasa tipo 1 codificada por bws1+ en el control mitótico de la levadura de fisión
Cell
|June 16, 1989
Resumen
Los investigadores identificaron un nuevo gen, bws1+, que evita la necesidad de wee1+ en la división celular de la levadura de fisión. Esta derivación se logra por una proteína fosfatasa, lo que sugiere un papel para las fosfatasas en el control mitótico.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- La división celular de las levaduras de fisión está regulada por la interacción de activadores mitóticos como cdc25+ e inhibidores como wee1+.
- Mientras que el cdc25+ es esencial para la mitosis, este requisito puede ser eludido en los wee1-mutantes.
Objetivo del estudio:
- Identificar genes que puedan eludir el requisito esencial de cdc25+ en la mitosis de la levadura de fisión.
- Investigar el papel de nuevos genes en la regulación de la división celular.
Principales métodos:
- Cribado genético de mutantes de levadura de fisión.
- Aislamiento y caracterización de genes transmitidos por plásmidos.
- Secuenciación de nucleótidos y análisis de homología de proteínas.
Principales resultados:
- Se aisló un nuevo gen, bws1+, que rescata el fenotipo sensible a la temperatura de los mutantes dobles cdc25ts wee1-.
- bws1+ también evita el efecto supresor de los alelos cdc2w en los mutantes con pérdida de función de cdc25.
- La proteína Bws1+ predicha comparte identidad de alto contenido de aminoácidos con las subunidades catalíticas de la proteína fosfatasa de tipo 1 de los mamíferos.
Conclusiones:
- El gen bws1+ codifica una proteína fosfatasa involucrada en la vía de control mitótico.
- Este hallazgo sugiere que las proteínas fosfatasas, además de las proteínas quinasas como wee1+, juegan un papel importante en la regulación de la división celular en la levadura de fisión.
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