A multicopy suppressor ofnin1-1 of the yeastSaccharomyces cerevisiae is a counterpart of theDrosophila melanogaster diphenol oxidase A2 gene,Dox-A2 (original) (raw)

Abstract

NIN1 is an essential gene for growth of the yeast_Saccharomyces cerevisiae_ and was recently found to encode a component of the regulatory subunit of the 26S proteasome. The_nin1-1_ mutant is temperature sensitive and its main defect is in G1/S progression and G2/M progression at non-permissive temperatures. One of the two multicopy suppressors of_nin1-1, SUN2_ (SUppressor of Nin1-1), was found to encode a protein of 523 amino acids whose sequence is similar to those of_Drosophila melanogaster_ diphenol oxidase A2 and the mouse mast-cell Tum− transplantation antigen, P91A. The C-terminal half of Sun2p was found to be functional as Sun2p at 25° C, 30° C, and 34° C but not at 37° C. The open reading frame (ORF) of the_Drosophila_ diphenol oxidase A2 gene (Dox-A2) was obtained from a lambda phage cDNA library using the polymerase chain reaction technique. The_Dox-A2_ ORF driven by the_TDH3_ promoter complemented the phenotype of a strain deleted for_sun2_. This_Dox-A2_-dependent strain was temperature sensitive and accumulated dumb-bell-shaped cells, with an undivided nucleus at the isthmus, after temperature upshift. This morphology is similar to that of_nin1-1_ cells kept at a restrictive temperature. These results suggest that_SUN2_ is a functional counterpart of_Dox-A2_ and that these genes play a pivotal role in the cell cycle in each organism.

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  1. M. Kawamura
    Present address: First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Hongo, 113, Tokyo
  2. K. Kominami
    Present address: ICRF, Laboratory of Cell Regulation, WC2A 3PX, London, UK

Authors and Affiliations

  1. Laboratory of Genetics, Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, 113, Tokyo, Japan
    M. Kawamura, K. Kominami, J. Takeuchi & A. Toh-e

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  1. M. Kawamura
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  2. K. Kominami
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  3. J. Takeuchi
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  4. A. Toh-e
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Communicated by C. P. Hollenberg

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Kawamura, M., Kominami, K., Takeuchi, J. et al. A multicopy suppressor of_nin1-1_ of the yeast_Saccharomyces cerevisiae_ is a counterpart of the_Drosophila melanogaster_ diphenol oxidase A2 gene,Dox-A2.Molec. Gen. Genet. 251, 146–152 (1996). https://doi.org/10.1007/BF02172912

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