Reference: Maiti SN, et al. (1988) Effect of valine and the herbicide sulfometuron methyl on acetolactate synthase activity in nuclear and plasmid-borne sulphometuron methyl resistant Saccharomyces cerevisiae strains. Can J Microbiol 34(5):680-5

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Abstract


Acetolactate synthase (ALS) specific activity was evaluated in isogenic lines of Saccharomyces cerevisiae carrying the wild-type ILV2 gene or mutations in this gene for resistance to the herbicide sulfometuron methyl (SM). Statistical comparisons were made between two nuclear alleles and among five alleles borne on a YE chimaeric plasmid transformed into a strain carrying a 1.5-kilobase deletion in the nuclear ILV2 gene. Decreased ALS activity of plasmid-borne SM-resistant mutations was shown not to be caused by copy number effects. ALS-specific activity in strains carrying the wild-type ILV2 allele exhibited strong feedback inhibition by valine and was sensitive to SM. All nuclear and plasmid-borne SM-resistance alleles resulted in ALS-specific activity highly resistant to SM and resistant to valine feedback inhibition.

Reference Type
Comparative Study | Journal Article | Research Support, Non-U.S. Gov't
Authors
Maiti SN, Zink MW, Rank GH
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