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La histona de levadura H2B que contiene grandes deleciones de amino terminales puede funcionar in vivo
Cell
|December 1, 1983
Resumen
La histona H2B es una histona
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las histonas son cruciales para el empaquetado del ADN en los nucleosomas.
- El amino terminus de las histonas se extiende fuera del núcleo del nucleosoma.
- Los estudios in vitro sugieren que los amino terminos no son esenciales para el ensamblaje del nucleosoma.
Objetivo del estudio:
- Para investigar la importancia in vivo de las regiones amino-terminales de la histona H2B.
- Para determinar si las deleciones amino-terminales impactan la función de la histona en la levadura.
Principales métodos:
- Histona de levadura construida con mutaciones H2B con deleciones en el amino terminus.
- Se utilizan cepas de levadura que carecen de proteína H2B de tipo silvestre.
- Evalúa la función proteica, el fenotipo y el ensamblaje cromatínico de las histonas mutantes in vivo.
Principales resultados:
- La histona H2B de levadura funciona in vivo a pesar de las grandes deleciones amino-terminales.
- Las proteínas mutantes no mostraron ningún fenotipo obvio y no fueron seleccionadas durante el ensamblaje de la cromatina.
- La eliminación de una porción significativa del extremo carboxilo resultó letal.
Conclusiones:
- El amino terminus de la histona H2B es en gran medida indispensable para las funciones esenciales in vivo.
- Las funciones esenciales de la histona están asociadas principalmente con otras regiones que no sean el amino terminus.
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