Summary
A potential membrane-interacting site within the essential growth-controlling carboxy-terminal region of the CDC25 protein was interrupted by a lethal mutation (1461 Tyr→Asp and 1462 Leu→Arg). The elimination of two potential phosphorylation sites found in the same region (1489 Thr→Pro and 1584 Ser→Pro) does not affect growth but completely prevents glucose-induced cAMP signalling in the double mutant, whereas the single mutants produce normal or slightly retarded cAMP signals. A cluster of five potential targets for cAMP-dependent phosphorylation at the amino-terminal region could be deleted without affecting phenotypic properties. It is concluded that the carboxy-terminal 137 residues of the CDC25 protein are involved in three different functions: control of mitotic growth, glucose-induced hyperactivation of adenylate cyclase, and feedback inhibition of cAMP synthesis.
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Communicated by C.P. Hollenberg
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Schomerus, C., Munder, T. & Küntzel, H. Site-directed mutagenesis of the Saccharomyces cerevisiae CDC25 gene: effects on mitotic growth and cAMP signalling. Molec. Gen. Genet. 223, 426–432 (1990). https://doi.org/10.1007/BF00264449
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DOI: https://doi.org/10.1007/BF00264449