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Una proteína mitocondrial de maíz de 13 kilodaltones en E. coli confiere sensibilidad a la toxina de Bipolaris maydis
R E Dewey1, J N Siedow, D H Timothy
1Department of Crop Science, North Carolina State University, Raleigh 27695.
Resumen
El citoplasma estéril masculino de Texas (cms-T) en el maíz está vinculado a un gen mitocondrial único. Este gen produce una proteína de 13 kDa que confiere sensibilidad a la toxina BmT y al metomil, lo que explica la esterilidad masculina.
Área de la Ciencia:
- Biología vegetal Biología vegetal
- Genética mitocondrial genética mitocondrial
- La bioquímica es la bioquímica.
Sus antecedentes:
- El citoplasma estéril masculino de Texas (cms-T) en el maíz se caracteriza por la esterilidad masculina heredada citoplasmáticamente.
- Las mitocondrias del maíz cms-T exhiben una sensibilidad específica a la toxina BmT de Bipolaris maydis y al insecticida methomyl.
Objetivo del estudio:
- Para investigar el papel de un gen mitocondrial único en el maíz cms-T.
- Para determinar la función del polipéptido de 13 kilodaltones asociado con la esterilidad masculina.
Principales métodos:
- La expresión de un gen mitocondrial específico de cms-T en Escherichia coli.
- La evaluación de la respiración celular completa y la hinchazón de los esferoplastos en cultivos de E. coli tras la adición de toxina BmT o metomil.
Principales resultados:
- E. coli que produce el polipéptido de 13 kDa mostró inhibición de la respiración y hinchazón de los esferoplastos cuando se expuso a la toxina BmT o al metomil.
- Estos efectos imitaban los observados en las mitocondrias cms-T aisladas.
- La región amino-terminal del polipéptido de 13 kDa fue identificada como crucial para la interacción con las toxinas.
Conclusiones:
- El polipéptido de 13 kilodaltones está implicado en conferir sensibilidad a las toxinas a las mitocondrias del maíz cms-T.
- Esta proteína juega un papel clave en el fenotipo de esterilidad masculina observado en el maíz cms-T.
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