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La gamma-tubulina es una proteína centrosomal requerida para la nucleación de microtúbulos dependiente del ciclo
H C Joshi1, M J Palacios, L McNamara
1Department of Anatomy and Cell Biology, Emory University School of Medicine, Atlanta, Georgia 30322.
Nature
|March 5, 1992
Resumen
La gamma-tubulina es esencial para la nucleación de microtúbulos en las células de mamíferos. Esta proteína es necesaria para la función del centrosoma y el ensamblaje adecuado del huso durante la división celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Dinámica del citoesqueleto Dinámica del citoesqueleto
Sus antecedentes:
- La gamma-tubulina es una proteína conservada dentro de la familia de las tubulinas.
- Se localiza en los centros organizadores de microtúbulos.
- Las mutaciones en la gamma-tubulina causan la detención mitótica en los hongos.
Objetivo del estudio:
- Para investigar la función in vivo de la gamma-tubulina en las células de los mamíferos.
- Determinar el papel de la gamma-tubulina en la nucleación de microtúbulos y la progresión del ciclo celular.
Principales métodos:
- Generó un anticuerpo policlonal contra un segmento conservado de gamma-tubulina.
- Microinyectó el anticuerpo en células de mamíferos en cultivo.
- Se utilizó inmunofluorescencia para localizar la gamma-tubulina y evaluar el crecimiento de los microtúbulos y la formación de huso.
Principales resultados:
- El anticuerpo se une con éxito a los centrosomas nativos durante todo el ciclo celular.
- El crecimiento de los microtúbulos fue inhibido después de la despolimerización en presencia del anticuerpo.
- El ensamblaje del husillo falló en células inyectadas antes o durante la mitosis.
Conclusiones:
- La gamma-tubulina es indispensable para la nucleación de microtúbulos in vivo en las células de mamíferos.
- Desempeña un papel crítico en la función del centrosoma y la formación del huso mitótico.
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