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Mutants inducible for sexual agglutinability in Saccharomyces cerevisiae

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Summary

We have isolated the mutants, T55s-41(a) and T562s-161 (α) which have no sexual agglutinability when cultured at 28°C, but become sexually agglutinable by the action of the sex pheromone produced by respective opposite mating type. The sex-specific glycoproteins responsible for sexual agglutination were detected in the mutants treated with the opposite mating type pheromone, but not in those treated with the same mating type pheromone.

The induction of sexual agglutinability by the pheromone required both nitrogen and carbon sources and was inhibited by cycloheximide. The induction by the pheromone of sexual agglutinability was much more sensitive to osmotic shock and Triton X-100 in T55s-41 than in H1-0, an inducible a strain found in our stock cultures. When cultured at 22°C both T55s-41 and T562s-161 produced respective agglutination substances without the sex pheromones.

H1-0 carried more than one genes responsible for the inducibility (inducible genes). The inducible genes carried by T55s-41 and T562s-161 were recessive, possibly linked to none of the mating type locus, thr4 and his 4, and shown to be identical. The inducible gene in H22, an inducible a strain found in our stock cultures and at least one of the inducible genes in H1-0 were linked to the mating type locus. All the inducible genes observed so far were not specific to the mating type in their action.

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Authors and Affiliations

  1. Biological Institute, Faculty of Science, Nagoya University, Chikusa-ku, 464, Nagoya, Japan

    Naohiko Yanagishima & Yoshiyuki Nakagawa

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  1. Naohiko Yanagishima
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  2. Yoshiyuki Nakagawa
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Communicated by F. Kaudewitz

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Yanagishima, N., Nakagawa, Y. Mutants inducible for sexual agglutinability in Saccharomyces cerevisiae . Molec. Gen. Genet. 178, 241–251 (1980). https://doi.org/10.1007/BF00270469

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  • DOI: https://doi.org/10.1007/BF00270469

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