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Nonsense Suppressors of Yeast Cause Osmotic-Sensitive Growth

Arjun Singh
Proceedings of the National Academy of Sciences of the United States of America
Vol. 74, No. 1 (Jan., 1977), pp. 305-309
Stable URL: http://www.jstor.org/stable/66565
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Nonsense Suppressors of Yeast Cause Osmotic-Sensitive Growth
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Abstract

Many nonsense suppressors of Saccharomyces cerevisiae cause growth inhibition on hypertonic media. Eight tyrosine-inserting UAA (ochre) suppressors, eight tyrosine-inserting UAG (amber) suppressors, a leucine-inserting UAG suppressor, and a serine-inserting recessive lethal UAG suppressor cause osmotic sensitivity, whereas a serine-inserting UAA suppressor does not cause sensitivity. Although the mechanism is not understood, the growth inhibition of specific suppressors on hypertonic media is correlated with their efficiencies of suppression. This heretofore unknown property of nonsense suppressors is useful for mitotic mapping, selecting tRNA mutants, selecting antisuppressors, and scoring nonsense suppressors.

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