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1 Laboratory of Molecular Cell Biology, National Cancer Institute, National Institutes of Health, Building 37, Room 6068, Bethesda, MD 20892-4255, USA. 2 Laboratory of Molecular Cell Biology, National Cancer Institute, National Institutes of Health, Building 37, Room 6068, Bethesda, MD 20892-4255, USA; Present address: Department of Carcinogenesis, MD Anderson Cancer Center, Science Park Research Division, Smithville, TX 78957, USA.
* To whom correspondence should be addressed. E-mail: carlwu{at}helix.nih.gov.
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 ATPase,is the catalytic core of a multi-subunit, histone variant exchangerthat efficiently replaces conventional histone H2A with histoneH2AZ in nucleosome arrays. Swr1 is required for the depositionof histone H2AZ at specific chromosome locations in vivo, andSwr1 and H2AZ commonly regulate a subset of yeast genes. Thesefindings define a new role for the ATP-dependent chromatin remodelingmachinery.
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