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Molecular and Cellular Biology, April 2003, p. 2800-2820, Vol. 23, No. 8
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.8.2800-2820.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

A Multiplicity of Coactivators Is Required by Gcn4p at Individual Promoters In Vivo

Mark J. Swanson, Hongfang Qiu, Laarni Sumibcay, Anna Krueger, Soon-ja Kim, Krishnamurthy Natarajan,{dagger} Sungpil Yoon, and Alan G. Hinnebusch*

Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, Bethesda, Maryland 20892

Received 10 September 2002/ Returned for modification 22 October 2002/ Accepted 15 January 2003

Transcriptional activators interact with multisubunit coactivators that modify chromatin structure or recruit the general transcriptional machinery to their target genes. Budding yeast cells respond to amino acid starvation by inducing an activator of amino acid biosynthetic genes, Gcn4p. We conducted a comprehensive analysis of viable mutants affecting known coactivator subunits from the Saccharomyces Genome Deletion Project for defects in activation by Gcn4p in vivo. The results confirm previous findings that Gcn4p requires SAGA, SWI/SNF, and SRB mediator (SRB/MED) and identify key nonessential subunits of these complexes required for activation. Among the numerous histone acetyltransferases examined, only that present in SAGA, Gcn5p, was required by Gcn4p. We also uncovered a dependence on CCR4-NOT, RSC, and the Paf1 complex. In vitro binding experiments suggest that the Gcn4p activation domain interacts specifically with CCR4-NOT and RSC in addition to SAGA, SWI/SNF, and SRB/MED. Chromatin immunoprecipitation experiments show that Mbf1p, SAGA, SWI/SNF, SRB/MED, RSC, CCR4-NOT, and the Paf1 complex all are recruited by Gcn4p to one of its target genes (ARG1) in vivo. We observed considerable differences in coactivator requirements among several Gcn4p-dependent promoters; thus, only a subset of the array of coactivators that can be recruited by Gcn4p is required at a given target gene in vivo.

* Corresponding author. Mailing address: Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, NIH, Bldg. 6A/B1A-13, Bethesda, MD 20892. Phone: (301) 496-4480. Fax: (301) 496-6828. E-mail: ahinnebusch{at}nih.gov.

{dagger} Present address: School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

Molecular and Cellular Biology, April 2003, p. 2800-2820, Vol. 23, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.8.2800-2820.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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