Abstract
NIN1 is an essential gene for growth of the yeastSaccharomyces cerevisiae and was recently found to encode a component of the regulatory subunit of the 26S proteasome. Thenin1-1 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 ofnin1-1, SUN2 (SUppressor of Nin1-1), was found to encode a protein of 523 amino acids whose sequence is similar to those ofDrosophila 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 theDrosophila diphenol oxidase A2 gene (Dox-A2) was obtained from a lambda phage cDNA library using the polymerase chain reaction technique. TheDox-A2 ORF driven by theTDH3 promoter complemented the phenotype of a strain deleted forsun2. ThisDox-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 ofnin1-1 cells kept at a restrictive temperature. These results suggest thatSUN2 is a functional counterpart ofDox-A2 and that these genes play a pivotal role in the cell cycle in each organism.
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Communicated by C. P. Hollenberg
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Kawamura, M., Kominami, K., Takeuchi, J. et al. A multicopy suppressor ofnin1-1 of the yeastSaccharomyces cerevisiae is a counterpart of theDrosophila melanogaster diphenol oxidase A2 gene,Dox-A2 . Molec. Gen. Genet. 251, 146–152 (1996). https://doi.org/10.1007/BF02172912
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DOI: https://doi.org/10.1007/BF02172912