Molecular insights into the recognition of N-terminal histone modifications by the BRPF1 bromodomain.

Molecular insights into the recognition of N-terminal histone modifications by the BRPF1 bromodomain.
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DOI:
10.1016/j.jmb.2013.12.007
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发表时间:
2014-04-17
影响因子:
5.6
通讯作者:
Glass, Karen C.
Glass, Karen C.
中科院分区:
生物学2区
文献类型:
--
作者:
Poplawski, Amanda;Hu, Kaifeng;Lee, Woonghee;Natesan, Senthil;Peng, Danni;Carlson, Samuel;Shi, Xiaobing;Balaz, Stefan;Markley, John L.;Glass, Karen C.

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The monocytic leukemic zinc-finger (MOZ) histone acetyltransferase (HAT) acetylates free histones H3, H4, H2A, and H2B in vitro and is associated with up-regulation of gene transcription. The MOZ HAT functions as a quaternary complex with the bromodomain-PHD finger protein 1 (BRPF1), inhibitor of growth 5 (ING5), and hEaf6 subunits. BRPF1 links the MOZ catalytic subunit to the ING5 and hEaf6 subunits, thereby promoting MOZ HAT activity. Human BRPF1 contains multiple effector domains with known roles in gene transcription, and chromatin binding and remodeling. However, the biological function of the BRPF1 bromodomain remains unknown. Our findings reveal novel interactions of the BRPF1 bromodomain with multiple acetyllysine residues on the N-terminus of histones, and show it preferentially selects for H2AK5ac, H4K12ac and H3K14ac. We used chemical shift perturbation data from NMR titration experiments to map the BRPF1 bromodomain ligand binding pocket and identified key residues responsible for coordination of the post-translationally modified histones. Extensive molecular dynamics simulations were used to generate structural models of bromodomain-histone ligand complexes, to analyze H-bonding and other interactions, and to calculate the binding free energies. Our results outline the molecular mechanism driving binding specificity of the BRPF1 bromodomain for discrete acetyllysine residues on the N-terminal histone tails. Together these data provide insights on how histone recognition by the bromodomain directs the biological function of BRPF1, ultimately targeting the MOZ HAT complex to chromatin substrates.
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