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Genetics, Vol 139, 511-521, Copyright © 1995
INVESTIGATIONS |
Mutations in GCR1, a Transcriptional Activator of Saccharomyces cerevisiae Glycolytic Genes, Function as Suppressors of gcr2 Mutations
H. Uemura and Y. Jigami
Department of Molecular Biology, National Institute of Bioscience and Human-Technology, Tsukuba Research Center (MITI), Tsukuba, Ibaraki, 305 Japan
The Saccharomyces cerevisiae GCR1 and GCR2 genes affect expression of most of the glycolytic genes. Evidence for Gcr1p/Gcr2p interaction has been presented earlier and is now supported by the isolation of mutations in Gcr1p suppressing gcr2, as assessed by growth and enzyme assay. Four specific mutation sites were identified. Together with use of the two-hybrid system of FIELDS and SONG, they show that Gcr1p in its N-terminal half has a potential transcriptional activating function as well as elements for interaction with Gcr2p, which perhaps acts normally to expose an otherwise cryptic activation domain on Gcr1p. Complementation of various gcr1 mutant alleles and results with the two-hybrid system also indicate that Gcr1p itself normally functions as an oligomer.
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