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Suppression 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.

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.

Pubmed ID: 8065298


  • Ward MP
  • Garrett S


Molecular and cellular biology

Publication Data

September 19, 1994

Associated Grants

  • Agency: NIGMS NIH HHS, Id: 5P32GM07184
  • Agency: NIGMS NIH HHS, Id: GM44666

Mesh Terms

  • Amino Acid Sequence
  • Base Sequence
  • Cyclic AMP-Dependent Protein Kinases
  • Epistasis, Genetic
  • Fungal Proteins
  • Gene Expression Regulation, Fungal
  • Genes
  • Genes, Fungal
  • Genes, Suppressor
  • Genetic Complementation Test
  • Molecular Sequence Data
  • RNA, Messenger
  • Restriction Mapping
  • Sequence Alignment
  • Sequence Homology, Amino Acid