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. 1990 Sep;10(9):4795–4806. doi: 10.1128/mcb.10.9.4795

Overlapping reading frames at the LYS5 locus in the yeast Yarrowia lipolytica.

J W Xuan 1, P Fournier 1, N Declerck 1, M Chasles 1, C Gaillardin 1
PMCID: PMC361085  PMID: 2388625

Abstract

Mutants affected at the LYS5 locus of Yarrowia lipolytica lack detectable dehydrogenase (SDH) activity. The LYS5 gene has previously been cloned, and we present here the sequence of the 2.5-kilobase-pair (kb) DNA fragment complementing the lys5 mutation. Two large antiparallel open reading frames (ORF1 and ORF2) were observed, flanked by potential transcription signals. Both ORFs appear to be transcribed, but several lines of evidence suggest that only ORF2 is translated and encodes SDH. (i) The global amino acid compositions of Saccharomyces cerevisiae SDH and of the putative ORF2 product are similar and that of ORF1 is dissimilar. (ii) An in-frame translational fusion of ORF2 with the Escherichia coli lacZ gene was introduced into yeast cells and resulted in a beta-galactosidase activity regulated similarly to SDH; no beta-galactosidase activity was obtained with an in-frame fusion of ORF1 with lacZ. (iii) The introduction of a stop codon at the beginning of ORF2 prevented SDH expression in yeast cells, whereas no phenotypic effect was observed when ORF1 translation was blocked.

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