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Originally published as MBC in Press, 10.1091/mbc.E02-05-0247 on October 16, 2002
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Vol. 14, Issue 1, 302-312, January 2003

Yeast Glycogen Synthase Kinase-3 Activates Msn2p-dependent Transcription of Stress Responsive Genes

Yuzoh Hirata,*dagger Tomoko Andoh,* Toshimasa Asahara,dagger and Akira Kikuchi*#

Departments of  *Biochemistry and  dagger Surgery, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 734-8551, Japan

The yeast Saccharomyces cerevisiae has four genes, MCK1, MDS1 (RIM11), MRK1, and YOL128c, that encode homologues of mammalian glycogen synthase kinase 3 (GSK-3). A gsk-3 null mutant in which these four genes are disrupted showed growth defects on galactose medium. We isolated several multicopy suppressors of this growth defect. Two of them encoded Msn2p and phosphoglucomutase (PGM). Msn2p is a transcription factor that binds to the stress-response element (STRE). PGM is an enzyme that interconverts glucose-1 phosphate and glucose-6 phosphate and is regulated by Msn2p at the transcriptional level. Expression of the mRNAs of PGM2 and DDR2, whose promoter regions possess STRE sequences, on induction by heat shock or salt stress was reduced not only in an msn2 msn4 (msn2 homologue) double mutant but also in the gsk-3 null mutant. STRE-dependent transcription was greatly inhibited in the gsk-3 null mutant or mck1 mds1 double mutant, and this phenotype was suppressed by the expression of Mck1p but not of a kinase-inactive form of Mck1p. Although Msn2p accumulated in the nucleus of the gsk-3 null mutant as well as in the wild-type strain under various stress conditions, its STRE-binding activity was reduced in extracts prepared from the gsk-3 null mutant or mck1 mds1 double mutant. These results suggest that yeast GSK-3 promotes formation of a complex between Msn2p and DNA, which is required for the proper response to different forms of stress. Because neither Msn2p-GSK-3 complex formation nor GSK-3-dependent phosphorylation of Msn2p could be detected, the regulation of Msn2p by GSK-3 may be indirect.

# Corresponding author. E-mail address: akikuchi{at}hiroshima-u.ac.jp.

Molecular Biology of the Cell
Vol. 14, 302-312, January 2003
Copyright © 2003 by The American Society for Cell Biology


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