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La proteína a1 altera la especificidad de unión al ADN del represor alfa 2
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.
Cell
|March 25, 1988
Resumen
La proteína alfa 2 de la levadura es la proteína alfa 2.
Área de la Ciencia:
- Biología molecular y celular Biología molecular y celular.
- Genética de la levadura Genética de la levadura
- Regulación genética Reglamento genético.
Sus antecedentes:
- La proteína alfa 2 en Saccharomyces cerevisiae (levadura) es un represor de la transcripción.
- Se une a secuencias de operadores para controlar la expresión de un gen específico.
Objetivo del estudio:
- Investigar cómo se puede alterar la especificidad de unión de la proteína alfa 2.
- Para entender el papel de la proteína a1 en la modulación de la función del alfa 2.
Principales métodos:
- Demostración de las interacciones proteína-ADN alteradas.
- Análisis de la represión génica en diferentes tipos de células de levadura.
Principales resultados:
- La proteína a1 cambia la especificidad de unión de alfa 2.
- Alfa 2, influenciado por a1, reprime los genes específicos del haploide en lugar de los genes específicos de a.
- En las celdas a/alfa, el alfa 2 se une a dos operadores distintos.
Conclusiones:
- La proteína a1 actúa como un factor de especificidad para el represor alfa 2.
- La regulación del tipo de apareamiento de la levadura implica modos de unión distintos de la alfa 2.
- Este mecanismo permite la represión génica diferencial en las células a/alfa.
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