Open AccessSuppression of a yeast cyclic AMP-dependent protein kinase defect by overexpression of SOK1, a yeast gene exhibiting sequence similarity to a developmentally regulated mouse gene.
Author(s) -
Michael P. Ward,
Steven Garrett
Publication year - 1994
Publication title -
molecular and cellular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.14
H-Index - 327
eISSN - 1067-8824
pISSN - 0270-7306
DOI - 10.1128/mcb.14.9.5619
Subject(s) - biology , cyclin dependent kinase 7 , map3k7 , cyclin dependent kinase 2 , mitogen activated protein kinase kinase , cyclin dependent kinase 9 , protein kinase a , map kinase kinase kinase , cyclin dependent kinase 4 , ask1 , gene , map2k7 , saccharomyces cerevisiae , kinase , c raf , cyclin dependent kinase complex , microbiology and biotechnology , biochemistry
Saccharomyces cerevisiae cyclic AMP-dependent protein kinase (A kinase) activity is essential for growth and cell cycle progression. Dependence on A kinase function can be partially relieved by the inactivation of a second kinase encoded by the gene YAK1. We have isolated two new genes, SOK1 and SOK2 (suppressor of kinase), as gene dosage suppressors of the conditional growth defect of several temperature-sensitive A kinase mutants. Overexpression of SOK1, like lesions in YAK1, also restores growth to a strain (tpk1 tpk2 tpk3) lacking all A kinase activity. The SOK1 gene is not essential, but a sok1::HIS3 disruption abrogates suppression of an A kinase defect by yak1. These results suggest that Yak1 and Sok1 define a linear pathway that is partially redundant with that of the A kinase. Activation of Sok1, by SOK1 overexpression or by inactivation of the negative regulator Yak1, renders a cell independent of A kinase function. The implications of such a model are particularly intriguing in light of the nuclear localization pattern of the overexpressed Sok1 protein and the primary sequence homology between SOK1 and a recently described, developmentally regulated mouse gene.