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La metilación de la histona H3 lisina 9 crea un sitio de unión para las proteínas HP1
M Lachner1, D O'Carroll, S Rea
1Research Institute of Molecular Pathology, The Vienna Biocenter, Vienna, Austria.
Nature
|March 10, 2001
Resumen
Las metiltransferasas de mamíferos (Suv39h HMTases) crean sitios de unión para las proteínas HP1 mediante la metilación de la histona H3. Este sistema SUV39H-HP1 es crucial para silenciar los genes y mantener la estructura de la heterocromatina.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La epigenética es la epigenética.
- Biología de la cromatina Biología de la cromatina
Sus antecedentes:
- Las modificaciones de la histona regulan la accesibilidad y la expresión de los genes.
- La restricción de la expresión génica es vital para los procesos celulares y del desarrollo.
- La formación de la heterocromatina implica el silenciamiento de genes y la estructura de la cromatina supra-nucleosómica.
Objetivo del estudio:
- Para investigar el papel de las metiltransferasas de mamíferos (Suv39h HMTases) en la formación de heterocromatina.
- Para dilucidar el mecanismo molecular que vincula la metilación de histonas a la unión a la proteína HP1.
- Para entender cómo el sistema SUV39H-HP1 contribuye a los subdominios heterocromáticos.
Principales métodos:
- Ensayos de unión in vitro utilizando péptidos de histona H3 metilados y proteínas HP1.
- Análisis de la asociación de la proteína HP1 con la heterocromatina en los fibroblastos de ratón Suv39h de doble cero.
- Restauración de la asociación HP1 tras la reintroducción de una HMTasa SWUV39H1 catalíticamente activa.
Principales resultados:
- Suv39h La HMTasa metila la histona H3 en la lisina 9, generando un sitio de unión para las proteínas HP1.
- El dominio cromático de las proteínas HP1 reconoce específicamente el epítopo de lisina metilada 9 en la histona H3.3.
- La asociación de la proteína HP1 con la heterocromatina depende de la actividad de la HMTasa Suv39h in vivo.
- La reintroducción de SWUV39H1 restaura la asociación de la heterocromatina HP1 en las células deficientes en Suv39h.
Conclusiones:
- El sistema de metilación SUV39H-HP1 proporciona un mecanismo molecular para la unión de HP1 a la histona H3 metilada.
- Este sistema es esencial para la propagación de subdominios heterocromáticos en la cromatina nativa.
- La metilación de la histona H3 lisina 9 por Suv39h HMTases es un evento clave en el establecimiento y mantenimiento de la heterocromatina.
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