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Molecular and Cellular Biology, November 2004, p. 9424-9436, Vol. 24, No. 21
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.21.9424-9436.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The Yaf9 Component of the SWR1 and NuA4 Complexes Is Required for Proper Gene Expression, Histone H4 Acetylation, and Htz1 Replacement near Telomeres

Haiying Zhang,1,2,{ddagger} Daniel O. Richardson,1,2,{ddagger} Douglas N. Roberts,1,2 Rhea Utley,3 Hediye Erdjument-Bromage,4 Paul Tempst,4 Jacques Côté,3 and Bradley R. Cairns1,2*

Howard Hughes Medical Institute,1 Department of Oncological Sciences, School of Medicine, University of Utah, Salt Lake City, Utah,2 Molecular Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York,4 Cancer Research Center, Laval University, Quebec City, Quebec, Canada3

Received 12 March 2004/ Returned for modification 9 April 2004/ Accepted 7 August 2004

Yaf9, Taf14, and Sas5 comprise the YEATS domain family in Saccharomyces cerevisiae, which in humans includes proteins involved in acute leukemias. The YEATS domain family is essential, as a yaf9{Delta} taf14{Delta} sas5{Delta} triple mutant is nonviable. We verify that Yaf9 is a stable component of NuA4, an essential histone H4 acetyltransferase complex. Yaf9 is also associated with the SWR1 complex, which deposits the histone H2A variant Htz1. However, the functional contribution of Yaf9 to these complexes has not been determined. Strains lacking YAF9 are sensitive to DNA-damaging agents, cold, and caffeine, and the YEATS domain is required for full Yaf9 function. NuA4 lacking Yaf9 retains histone acetyltransferase activity in vitro, and Yaf9 does not markedly reduce bulk H4 acetylation levels, suggesting a role for Yaf9 in the targeting or regulation of NuA4. Interestingly, yaf9{Delta} strains display reduced transcription of genes near certain telomeres, and their repression is correlated with reduced H4 acetylation, reduced occupancy by Htz1, and increased occupancy by the silencing protein Sir3. Additionally, the spectra of phenotypes, genes, and telomeres affected in yaf9{Delta} and htz1{Delta} strains are significantly similar, further supporting a role for Yaf9 in Htz1 deposition. Taken together, these data indicate that Yaf9 may function in NuA4 and SWR1 complexes to help antagonize silencing near telomeres.


* Corresponding author. Mailing address: Department of Oncological Sciences, School of Medicine, University of Utah, 2000 Circle of Hope, Salt Lake City, UT 84112. Phone: (801) 585-1822. Fax: (801) 585-6410. E-mail: brad.cairns{at}hci.utah.edu.

{dagger} Supplemental material for this article may be found at http://mcb.asm.org/.

{ddagger} H.Z. and D.O.R. contributed equally to this work.


Molecular and Cellular Biology, November 2004, p. 9424-9436, Vol. 24, No. 21
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.21.9424-9436.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.




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