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Un mecanismo de conteo de proteínas para la regulación de la longitud de los telómeros en levaduras
1Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Science (New York, N.Y.)
|February 14, 1997
Resumen
En la levadura, la proteína Rap1p regula la longitud de los telómeros, asegurando un número constante de repeticiones. Dirigir Rap1p a los telómeros con proteínas híbridas acorta los tractos de repetición, lo que indica un mecanismo de retroalimentación para el control de la longitud.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología de la levadura Biología de la levadura.
Sus antecedentes:
- Los telómeros protegen los extremos de los cromosomas de la degradación y la fusión.
- La longitud de los telómeros está estrictamente regulada en la mayoría de los organismos.
- En Saccharomyces cerevisiae, Rap1p es un regulador negativo clave del alargamiento de los telómeros.
Objetivo del estudio:
- Para investigar el mecanismo de regulación de la longitud de los telómeros por Rap1p en la levadura.
- Para determinar si la función reguladora de Rap1p es dependiente de la orientación.
- Para explorar el mecanismo de retroalimentación que controla la longitud del tracto de repetición de los telómeros.
Principales métodos:
- Utilizando proteínas híbridas con el extremo carboxilo Rap1p y un dominio de unión al ADN heterólogo.
- Dirigir estas proteínas híbridas a los telómeros en Saccharomyces cerevisiae.
- Cuantificación de la longitud del tracto de repetición de los telómeros y el número de moléculas Rap1p.
Principales resultados:
- La regulación de la longitud de los telómeros por Rap1p es independiente de la orientación de repetición de los telómeros.
- Dirigir Rap1p a los telómeros reduce el número de repeticiones.
- La extensión del acortamiento de los telómeros es proporcional al número de moléculas de Rap1p objetivo.
Conclusiones:
- Rap1p funciona en un bucle de retroalimentación para mantener una distribución estrecha de las longitudes del tracto de repetición de los telómeros.
- El mecanismo regulador de la longitud de los telómeros puede detectar el número preciso de moléculas Rap1p unidas a los telómeros.
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