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Protein-protein interactions in the yeastPKC1 pathway: Pkc1p interacts with a component of the MAP kinase cascade

Molecular and General Genetics MGG volume 251, pages 682–691 (1996)Cite this article

Abstract

The two-hybrid system for the identification of protein-protein interactions was used to screen for proteins that interact in vivo with theSaccharomyces cerevisiae Pkc1 protein, a homolog of mammalian protein kinase C. Four positive clones were isolated that encoded portions of the protein kinase Mkk1, which acts downstream of Pkc1p in thePKC1-mediated signalling pathway. Subsequently, Pkc1p and the otherPKC1 pathway components encoding members of a MAP kinase cascade, Bck1p (a MEKK), Mkk1p, Mkk2p (two functionally homologous MEKs), and Mpk1p (a MAP kinase), were tested pairwise for interaction in the two-hybrid assay. Pkc1p interacted specifically with small N-terminal deletions of Mkk1p, and no interaction between Pkc1p and any of the other known pathway components could be detected. Interaction between Pkc1p and Mkk1p, however, was found to be independent of Mkk1p kinase activity. Bck1p was also found to interact with Mkk1p and Mkk2p, and the interaction required only the predicted C-terminal catalytic domain of Mkk1p. Furthermore, we detected protein-protein interactions between two Bck1p molecules via their N-terminal regions. Finally, Mkk2p and Mpk1p also interacted in the two-hybrid assay. These results suggest that the members of thePKC1-mediated MAP kinase cascade form a complex in vivo and that Pkc1p is capable of directly interacting with at least one component of this pathway.

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  1. GLAXO Institute for Molecular Biology, Chemin des Aulx, CH-1228 Plan-les-Ouates, Geneva, Switzerland

    G. Paravicini & L. Friedli

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  1. G. Paravicini
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  2. L. Friedli
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Communicated by D. Y. Thomas

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Paravicini, G., Friedli, L. Protein-protein interactions in the yeastPKC1 pathway: Pkc1p interacts with a component of the MAP kinase cascade. Molec. Gen. Genet. 251, 682–691 (1996). https://doi.org/10.1007/BF02174117

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  • DOI: https://doi.org/10.1007/BF02174117

Key words

  • Saccharomyces cerevisiae
  • Two-hybrid system
  • Protein-protein interactions
  • PKC1 pathway
  • MAP kinase cascade