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Molecular and Cellular Biology, July 2008, p. 4342-4353, Vol. 28, No. 13
0270-7306/08/$08.00+0     doi:10.1128/MCB.00182-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Chaperone Control of the Activity and Specificity of the Histone H3 Acetyltransferase Rtt109{triangledown} ,{dagger}

Jeffrey Fillingham,1 Judith Recht,2 Andrea C. Silva,3 Bernhard Suter,1,4 Andrew Emili,1,5 Igor Stagljar,4 Nevan J. Krogan,6 C. David Allis,2 Michael-Christopher Keogh,3 and Jack F. Greenblatt1,5*

Banting and Best Department of Medical Research, Terrence Donnelly Centre for Cellular and Biomolecular Research (CCBR), University of Toronto, 160 College St., Toronto, Ontario M5S 3E1, Canada,1 Laboratory of Chromatin Biology, The Rockefeller University, 1230 York Ave., Box 78, New York, New York 10065,2 Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461,3 Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 3E1, Canada,4 Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 3E1, Canada,5 Department of Cellular and Molecular Pharmacology, University of California—San Francisco, San Francisco, California 941436

Received 4 February 2008/ Returned for modification 13 March 2008/ Accepted 22 April 2008

Acetylation of Saccharomyces cerevisiae histone H3 on K56 by the histone acetyltransferase (HAT) Rtt109 is important for repairing replication-associated lesions. Rtt109 purifies from yeast in complex with the histone chaperone Vps75, which stabilizes the HAT in vivo. A whole-genome screen to identify genes whose deletions have synthetic genetic interactions with rtt109{Delta} suggests Rtt109 has functions in addition to DNA repair. We show that in addition to its known H3-K56 acetylation activity, Rtt109 is also an H3-K9 HAT, and we show that Rtt109 and Gcn5 are the only H3-K9 HATs in vivo. Rtt109's H3-K9 acetylation activity in vitro is enhanced strongly by Vps75. Another histone chaperone, Asf1, and Vps75 are both required for acetylation of lysine 9 on H3 (H3-K9ac) in vivo by Rtt109, whereas H3-K56ac in vivo requires only Asf1. Asf1 also physically interacts with the nuclear Hat1/Hat2/Hif1 complex that acetylates H4-K5 and H4-K12. We suggest Asf1 is capable of assembling into chromatin H3-H4 dimers diacetylated on both H4-K5/12 and H3-K9/56.

* Corresponding author. Mailing address: University of Toronto, Banting and Best Department of Medical Research and Department of Molecular Genetics, Terrence Donnelly Centre for Cellular and Biomolecular Research (CCBR), 160 College St., Toronto, Ontario, Canada M5S 3E1. Phone: (416) 978-4141. Fax: (416) 978-828. E-mail: jack.greenblatt{at}utoronto.ca

{triangledown} Published ahead of print on 5 May 2008.

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

Molecular and Cellular Biology, July 2008, p. 4342-4353, Vol. 28, No. 13
0270-7306/08/$08.00+0     doi:10.1128/MCB.00182-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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