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Journal of Cell Science, Vol 107, Issue 9 2617-2622, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Yeast homolog of mammalian mitogen-activated protein kinase, FUS3/DAC2 kinase, is required both for cell fusion and for G1 arrest of the cell cycle and morphological changes by the cdc37 mutation

HA Fujimura
Laboratory of Genetics and Microbiology, Developmental and Reproductive Biology Center, Yamagata, Japan.

Saccharomyces cerevisiae FUS3/DAC2 protein kinase, a homolog of mammalian mitogen-activated protein (MAP) kinase, inactivates a G1 cyclin encoded by the CLN3 gene to arrest cell division in the G1 phase and activates a transcriptional factor STE12 in response to mating pheromone during sexual conjugation. To elucidate the role of the FUS3/DAC2 gene product in the mating process, I constructed and characterized dac2 cln3 double mutants. Here, I show that FUS3/DAC2 is required for completion of cell fusion even in the dac2 cln3 double mutants in which the pheromone response is restored, suggesting that FUS3/DAC2 plays a positive role in cell fusion during conjugation. In addition, the cdc dac2 and cdc37 ste double mutants were constructed and investigated for their phenotypes to clarify the relationship between FUS3/DAC2, STE7 or STE11 and CDC gene products (CDC28, 36, 37 and 39). The results indicate that FUS3/DAC2 may act upstream of CDC28 and provide evidence that the G1 arrest and morphological changes conferred by the cdc37 mutation may require FUS3/DAC2 (MAP kinase), STE7(MEK) and STE11 (MEK kinase).
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This article has been cited by other articles:


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M. V. Metodiev, D. Matheos, M. D. Rose, and D. E. Stone
Regulation of MAPK Function by Direct Interaction with the Mating-Specific Galpha in Yeast
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M. C. Gustin, J. Albertyn, M. Alexander, and K. Davenport
MAP Kinase Pathways in the Yeast Saccharomyces cerevisiae
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© The Company of Biologists Ltd 1994