Polybromo-1-bromodomains bind histone H3 at specific acetyl-lysine positions
Document Type
Article
Publication Date
4-13-2007
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. © 2007 Elsevier Inc. All rights reserved.
Publication Title
Biochemical and Biophysical Research Communications
Recommended Citation
Chandrasekaran, R.,
&
Thompson, M.
(2007).
Polybromo-1-bromodomains bind histone H3 at specific acetyl-lysine positions.
Biochemical and Biophysical Research Communications,
355(3), 661-666.
http://doi.org/10.1016/j.bbrc.2007.01.193
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/6014