FUS3 encodes a cdc2+/CDC28-related kinase required for the transition from mitosis into conjugation

Cell. 1990 Feb 23;60(4):649-64. doi: 10.1016/0092-8674(90)90668-5.


FUS3 is required for both the arrest of cells in G1 and mating. Upon exposure to mating pheromone, fus3-1 and fus3-2 mutants fail to arrest in G1 and continue to divide while undergoing the transcription induction and morphological changes typical of mating cells. The G1 arrest defect of these fus3 mutants is suppressed by a daf1/whi1 null mutation (also called cln3, a putative cyclin). FUS3 has a positive role in conjugation, because overexpression of FUS3 increases the pheromone sensitivity of wild-type cells, while the absence of FUS3 causes sterility. The suppression of a gpa1 null (G alpha subunit) by a fus3 null also suggests FUS3 is in the signal transduction pathway. The predicted FUS3 protein is 35% identical to the cdc2+/CDC28 kinases and 52% identical to the KSS1 predicted kinase.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • CDC2 Protein Kinase
  • Conjugation, Genetic*
  • Genes, Fungal*
  • Genotype
  • Membrane Fusion
  • Mitosis*
  • Molecular Sequence Data
  • Mutation
  • Phosphoproteins / genetics*
  • Protein Kinases / genetics*
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / enzymology
  • Saccharomyces cerevisiae / genetics*
  • Sequence Homology, Nucleic Acid


  • Phosphoproteins
  • Protein Kinases
  • CDC2 Protein Kinase

Associated data

  • GENBANK/M31132