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The conserved histone variant H2AZ has an important role inthe regulation of gene expression and the establishment of abuffer to the spread of silent heterochromatin. How histonevariants such as H2AZ are incorporated into nucleosomes hasbeen obscure. We have found that Swr1, a Swi2/Snf2-related adenosinetriphosphatase, is the catalytic core of a multisubunit, histone-variantexchanger that efficiently replaces conventional histone H2Awith histone H2AZ in nucleosome arrays. Swr1 is required forthe deposition of histone H2AZ at specific chromosome locationsin vivo, and Swr1 and H2AZ commonly regulate a subset of yeastgenes. These findings define a previously unknown role for theadenosine triphosphatedependent chromatin remodelingmachinery.
Laboratory of Molecular Cell Biology, National Cancer Institute, National Institutes of Health, Building 37, Room 6068, Bethesda, MD 208924255, USA.
Note added in proof: The subunits of the SWR1 complexVps72,Swc1, God1, Aor1, and Vps71 have been renamed Swc2, Swc3,Swc4, Swc5, and Swc6, respectively, by agreement with the laboratoriesof J. Greenblatt, H. Madhani, and J. Rine.
* These authors contributed equally to this work.
Present address: Department of Carcinogenesis, MD Anderson CancerCenter, Science Park Research Division, Smithville, TX 78957,USA.
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: carlwu{at}helix.nih.gov
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