Reference: Martin-Rendon E, et al. (1993) Isolation of a mutant allele that deregulates the threonine biosynthesis in Saccharomyces cerevisiae. Curr Genet 24(6):465-71

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Abstract


We have cloned the yeast allele HOM3-R2, that codes for a mutant aspartate kinase which is insensitive to feedback inhibition by threonine, by gap-repair. A strain carrying this allele in a multicopy plasmid, or integrated into the genome, accumulates 14-times and 8-times more threonine than the wild-type, respectively. The sequence of the mutant allele differs from that of the wild-type in a single base pair change, namely a G by an A, at position 1355 in the open reading frame. The fact that the presence of this mutant allele in a cell induces threonine overproduction points to aspartate kinase as the key enzyme in the regulation of threonine biosynthesis in yeast.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Martin-Rendon E, Farfán MJ, Ramos C, Calderon IL
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