Distinct Domains in High Mobility Group N Variants Modulate Specific Chromatin Modifications*

T. Ueda,Y. Postnikov,M. Bustin

Published 2006 in Journal of Biological Chemistry

ABSTRACT

We have demonstrated that levels of specific modification in histone H3 are modulated by members of the nucleosome-binding high mobility group N (HMGN) protein family in a variant-specific manner. HMGN1 (but not HMGN2) inhibits the phosphorylation of both H3S10 and H3S28, whereas HMGN2 enhances H3K14 acetylation more robustly than HMGN1. Two HMGN domains are necessary for modulating chromatin modifications, a non-modification-specific domain necessary for chromatin binding and a modification-specific domain localized in the C terminus of the HMGNs. Thus, chromatin-binding structural proteins such as HMGNs affect the levels of specific chromatin modifications and therefore may play a role in epigenetic regulation.

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