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Asociación física y funcional de una desmetilasa trimetilo H3K4 y Ring6a/MBLR, una proteína parecida a un policombo
Min Gyu Lee1, Jessica Norman, Ali Shilatifard
1The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA.
Cell
|February 27, 2007
Resumen
JARID1d es una nueva histona desmetilasa que elimina específicamente el trimetilo H3K4.4. Interactúa con Ring6a/MBLR, regulando su actividad e impactando la expresión génica y la iniciación de la transcripción.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología Molecular Biología Molecular
- Reglamento genético Reglamento genético.
Sus antecedentes:
- La metilación de la histona es una marca epigenética clave que controla la estructura de la cromatina y la expresión génica.
- BHC110/LSD1 fue identificado previamente como la primera histona desmetilasa dirigida al dimetilo H3K4.4.
- Comprender las enzimas que modifican la metilación de las histonas es crucial para descifrar la regulación génica.
Objetivo del estudio:
- Identificar y caracterizar nuevas histonas desmetilasas involucradas en la regulación génica.
- Investigar los objetivos específicos y los mecanismos regulatorios de JARID1d.
- Para explorar las interacciones funcionales de JARID1d con otras proteínas celulares.
Principales métodos:
- Pruebas bioquímicas para determinar la actividad de la desmetilasa.
- El aislamiento del complejo proteico y la co-inmunoprecipitación para identificar a los socios que interactúan.
- Inmunoprecipitación de cromatina (ChIP) para analizar la ocupación de proteínas y las modificaciones de histonas en genes específicos.
- Análisis de expresión génica y ensayos de reclutamiento sobre el agotamiento de proteínas.
Principales resultados:
- JARID1d fue identificado como una demetilasa específica para el trimetil H3K4.4.
- Los dominios JmjC, BRIGHT y C(5)HC(2) de JARID1d son esenciales para su actividad catalítica.
- JARID1d forma un complejo con Ring6a/MBLR, que regula su función enzimática.
- JARID1d y Ring6a/MBLR regulan la expresión y el estado de metilación H3K4 del gen Engrailed 2.
- El agotamiento de JARID1d conduce a un mayor reclutamiento de NURF y maquinaria de transcripción basal, afectando la iniciación transcripcional.
Conclusiones:
- JARID1d es una nueva histona desmetilasa dirigida al trimetilo H3K4.4.
- El complejo JARID1d-Ring6a/MBLR juega un papel importante en la regulación de la expresión génica.
- JARID1d contribuye al control de la iniciación transcripcional a través de su actividad de la H3K4 desmetilasa.
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