Tyrosine phosphorylation of the fission yeast cdc2+ protein kinase regulates entry into mitosis

Nature. 1989 Nov 2;342(6245):39-45. doi: 10.1038/342039a0.


The cdc2+ protein kinase (pp34) is found to be phosphorylated on tyrosine as well as serine and threonine residues in exponentially growing Schizosaccharomyces pombe. At mitosis, the level of pp34 phosphorylation on both threonine and tyrosine residues decreases. The single detectable site of tyrosine phosphorylation in pp34 has been mapped to Tyr 15, a residue within the presumptive ATP-binding domain. Substitution of this tyrosine by phenylalanine advances cells prematurely into mitosis, establishing that tyrosine phosphorylation/dephosphorylation directly regulates pp34 function.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • CDC2 Protein Kinase
  • Cell Cycle
  • Genes, Fungal
  • Interphase
  • Mitosis*
  • Molecular Sequence Data
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism*
  • Phosphorylation
  • Protein Kinases / metabolism*
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / enzymology
  • Saccharomycetales
  • Schizosaccharomyces / cytology*
  • Schizosaccharomyces / enzymology
  • Schizosaccharomyces / genetics
  • Tyrosine


  • Phosphoproteins
  • Tyrosine
  • Protein Kinases
  • CDC2 Protein Kinase