Nucleosome assembly protein 1 exchanges histone H2A-H2B dimers and assists nucleosome sliding - PubMed (original) (raw)
. 2005 Jan 21;280(3):1817-25.
doi: 10.1074/jbc.M411347200. Epub 2004 Oct 30.
Affiliations
- PMID: 15516689
- DOI: 10.1074/jbc.M411347200
Free article
Nucleosome assembly protein 1 exchanges histone H2A-H2B dimers and assists nucleosome sliding
Young-Jun Park et al. J Biol Chem. 2005.
Free article
Abstract
Eukaryotic chromatin is highly dynamic and turns over rapidly even in the absence of DNA replication. Here we show that the acidic histone chaperone nucleosome assembly protein 1 (NAP-1) from yeast reversibly removes and replaces histone protein dimer H2A-H2B or histone variant dimers from assembled nucleosomes, resulting in active histone exchange. Transient removal of H2A-H2B dimers facilitates nucleosome sliding along the DNA to a thermodynamically favorable position. Histone exchange as well as nucleosome sliding is independent of ATP and relies on the presence of the C-terminal acidic domain of yeast NAP-1, even though this region is not required for histone binding and chromatin assembly. Our results suggest a novel role for NAP-1 (and perhaps other acidic histone chaperones) in mediating chromatin fluidity by incorporating histone variants and assisting nucleosome sliding. NAP-1 may function either untargeted (if acting alone) or may be targeted to specific regions within the genome through interactions with additional factors.
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