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La complementación extracelular de una mutación del desarrollo implica una pequeña proteína de esporulación en la
J Willey1, R Santamaria, J Guijarro
1Department of Cellular and Developmental Biology, Harvard University, Cambridge, Massachusetts.
Cell
|May 17, 1991
Resumen
La formación de hifas aéreas de Streptomyces coelicolor requiere la proteína SapB. La aplicación de la proteína SapB cerca de las colonias mutantes restauró el crecimiento de las hifas aéreas, identificando a SapB como un factor morfogenético clave.
Área de la Ciencia:
- Microbiología Microbiología.
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- Streptomyces coelicolor sufre una diferenciación, formando hifas aéreas que se convierten en esporas.
- La formación de hifas aéreas está relacionada con la producción de SapB, una proteína que se encuentra alrededor de colonias bacterianas diferenciadas.
- La producción de SapB es deficiente en los mutantes bld (bloqueados en la formación de hifas aéreas) pero no en los mutantes whi (prevenida la formación de esporas).
Objetivo del estudio:
- Para investigar el papel de SapB en la formación de hifas aéreas de Streptomyces coelicolor.
- Para determinar si SapB es una proteína morfogenética esencial para el crecimiento aéreo.
Principales métodos:
- Caracterización de un mutante bld recientemente identificado en S. coelicolor.
- Evaluación del efecto de la proximidad a las bacterias productoras de SapB en la formación de hifas aéreas mutantes.
- Evaluar el impacto de la aplicación de proteínas SapB purificadas en las colonias mutantes.
Principales resultados:
- La formación de hifas aéreas en un mutante bld se restauró cuando se colocó cerca de las bacterias productoras de SapB.
- La aplicación de la proteína SapB purificada directamente a las colonias mutantes también restauró el crecimiento de las hifas aéreas.
- Estos hallazgos confirman el papel esencial de SapB para permitir que las hifas crezcan en el aire.
Conclusiones:
- SapB está implicado como una proteína morfogenética crucial en el desarrollo del micelio aéreo de Streptomyces coelicolor.
- SapB facilita la transición de las hifas superficiales al crecimiento aéreo, un paso clave de diferenciación.
- El estudio destaca la función de SapB en la superación de los bloqueos del desarrollo en S. coelicolor.
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