The SUP35 omnipotent suppressor gene is involved in the maintenance of the non-Mendelian determinant [psi+] in the yeast Saccharomyces cerevisiae. (original) (raw)
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M D Ter-Avanesyan, A R Dagkesamanskaya, V V Kushnirov, V N Smirnov, The SUP35 omnipotent suppressor gene is involved in the maintenance of the non-Mendelian determinant [psi+] in the yeast Saccharomyces cerevisiae., Genetics, Volume 137, Issue 3, 1 July 1994, Pages 671–676, https://doi.org/10.1093/genetics/137.3.671
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Abstract
The SUP35 gene of yeast Saccharomyces cerevisiae encodes a 76.5-kD ribosome-associated protein (Sup35p), the C-terminal part of which exhibits a high degree of similarity to EF-1 alpha elongation factor, while its N-terminal region is unique. Mutations in or overexpression of the SUP35 gene can generate an omnipotent suppressor effect. In the present study the SUP35 wild-type gene was replaced with deletion alleles generated in vitro that encode Sup35p lacking all or a part of the unique N-terminal region. These 5'-deletion alleles lead, in a haploid strain, simultaneously to an antisuppressor effect and to loss of the non-Mendelian determinant [psi+]. The antisuppressor effect is dominant while the elimination of the [psi+] determinant is a recessive trait. A set of the plasmid-borne deletion alleles of the SUP35 gene was tested for the ability to maintain [psi+]. It was shown that the first 114 amino acids of Sup35p are sufficient to maintain the [psi+] determinant. We propose that the Sup35p serves as a trans-acting factor required for the maintenance of [psi+].
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© Genetics 1994
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