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Genetics, Vol 142, 1095-1103, Copyright © 1996
INVESTIGATIONS |
Mutations in GCR3, a Gene Involved in the Expression of Glycolytic Genes in Saccharomyces cerevisiae, Suppress the Temperature-Sensitive Growth of hpr1 Mutants
H. Uemura, S. Pandit, Y. Jigami and R. Sternglanz
Department of Molecular Biology, National Institute of Bioscience and Human-Technology, Tsukuba, Ibaraki 305, Japan
To study the functions of DNA topoisomerase I and Hpr1 protein, a suppressor mutant of the temperature-sensitive growth of an hpr1 top1-5(ts) double mutant was isolated. The isolated triple mutant showed cold-sensitive growth. By complementation of this phenotype, the suppressor gene was cloned. DNA sequencing showed it to be GCR3, a gene involved in the expression of glycolytic genes. Further analysis showed that gcr3 mutations also suppressed the temperature-sensitive growth of hpr1 single mutants. Experiments with gcr3 truncation mutants also suggested a genetic interaction between GCR3 and HPR1. The fact that top1 suppressed the growth defect of gcr3 suggested an interaction between those two genes also. Plasmid DNA isolated from gcr3 mutants was significantly more negatively supercoiled than normal, suggesting that Gcr3 protein, like topoisomerase I and Hpr1p, affects chromatin structure, perhaps during transcription.
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