Three-dimensional structure of human chromatin accessibility complex hCHRAC by electron microscopy.
J Struct Biol
; 164(3): 263-9, 2008 Dec.
Article
en En
| MEDLINE
| ID: mdl-18814851
ABSTRACT
ATP-dependent chromatin remodeling complexes modulate the dynamic assembly and remodeling of chromatin involved in DNA transcription, replication, and repair. There is little structural detail known about these important multiple-subunit enzymes that catalyze chromatin remodeling processes. Here we report a three-dimensional structure of the human chromatin accessibility complex, hCHRAC, using single particle reconstruction by negative stain electron microscopy. This structure shows an asymmetric 15x10x12nm disk shape with several lobes protruding out of its surfaces. Based on the factors of larger contact area, smaller steric hindrance, and direct involvement of hCHRAC in interactions with the nucleosome, we propose that four lobes on one side form a multiple-site contact surface 10nm in diameter for nucleosome binding. This work provides the first determination of the three-dimensional structure of the ISWI-family of chromatin remodeling complexes.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Factores de Transcripción
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Cromatina
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Nucleosomas
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Cromosomas
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Adenosina Trifosfatasas
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Ensamble y Desensamble de Cromatina
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
J Struct Biol
Asunto de la revista:
BIOLOGIA MOLECULAR
Año:
2008
Tipo del documento:
Article
País de afiliación:
Estados Unidos