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Stepwise Histone Replacement by SWR1 Requires Dual Activation with Histone H2A.Z and Canonical Nucleosome

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Luk, Ed, Ranjan, Anand, FitzGerald, Peter C., Mizuguchi, Gaku, Huang, Yingzi, Wei, Debbie, Wu, Carl·2010·Cell

Abstract

Summary Histone variant H2A.Z-containing nucleosomes are incorporated at most eukaryotic promoters. This incorporation is mediated by the conserved SWR1 complex, which replaces histone H2A in canonical nucleosomes with H2A.Z in an ATP-dependent manner. Here, we show that promoter-proximal nucleosomes are highly heterogeneous for H2A.Z in Saccharomyces cerevisiae, with substantial representation of nucleosomes containing one, two, or no H2A.Z molecules. SWR1-catalyzed H2A.Z replacement in vitro occurs in a stepwise and unidirectional fashion, one H2A.Z-H2B dimer at a time, producing heterotypic nucleosomes as intermediates and homotypic H2A.Z nucleosomes as end products. The ATPase activity of SWR1 is specifically stimulated by H2A-containing nucleosomes without ensuing histone H2A eviction. Remarkably, further addition of free H2A.Z-H2B dimer leads to hyperstimulation of ATPase activity, eviction of nucleosomal H2A-H2B and deposition of H2A.Z-H2B. These results suggest that the combination of H2A-containing nucleosome and free H2A.Z-H2B dimer acting as both effector and substrate for SWR1 governs the specificity and outcome of the replacement reaction.

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Metadata

Authors
Luk, E., Ranjan, A., FitzGerald, P. C., Mizuguchi, G., Huang, Y., Wei, D., & Wu, C.
Venue
Cell
Publisher
Elsevier BV
Published
2010-11
Volume
143
Issue
5
Pages
725-736
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2008675991
Cited by
469
References
56
FWCI
7.09
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Stepwise Histone Replacement by SWR1 Requires Dual Activation with Histone H2A.Z and Canonical Nucleosome. https://app.cochat.ai/papers/10.1016/j.cell.2010.10.019
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Luk, E., Ranjan, A., FitzGerald, P. C., Mizuguchi, G., Huang, Y., Wei, D., & Wu, C. (2010). Stepwise Histone Replacement by SWR1 Requires Dual Activation with Histone H2A.Z and Canonical Nucleosome. Cell. https://doi.org/10.1016/j.cell.2010.10.019

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