Polybromo-1-bromodomains bind histone H3 at specific acetyl-lysine positions.
Biochem Biophys Res Commun
; 355(3): 661-6, 2007 Apr 13.
Article
em En
| MEDLINE
| ID: mdl-17320048
ABSTRACT
The human polybromo-1 protein is thought to localize the Polybromo, BRG1-associated factors chromatin-remodeling complex to kinetochores during mitosis via direct interaction of its six tandem bromodomains with acetylated nucleosomes. Bromodomains are acetyl-lysine binding modules roughly 100 amino acids in length originally found in chromatin associated proteins. Previous studies verified acetyl-histone binding by each bromodomain, but site-specificity, a central tenet of the histone code hypothesis, was not examined. Here, the acetylation site-dependence of bromodomain-histone interactions was examined using steady-state fluorescence anisotropy. Results indicate that single bromodomains bind specific acetyl-lysine sites within the histone tail with sub-micromolar affinity. Identification of duplicate target sites suggests that native Pb1 interacts with both copies of histone H3 upon nucleosome assembly. Quantitative analysis of single bromodomain-histone interactions can be used to develop hypotheses regarding the histone acetylation pattern that acts as the binding target of the native polybromo-1 protein.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Proteínas Nucleares
/
Histonas
/
Lisina
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article