Summary
The PGI1 gene of Saccharomyces cerevisiae coding for the glycolytic enzyme phosphoglucose isomerase has been cloned by complementation of a mutant strain (pgi1) with a strongly reduced phosphoglucose isomerase activity. A genomic library constructed in the yeast multicopy vector YEp13 (Nasmyth and Tatchell 1980) was used. Four plasmids containing an overlapping region of 4.1 kb were isolated and characterized by restriction endonuclease mapping. Southern analysis of genomic digests prepared with different restriction enzymes confirmed the same pattern for the chromosomal sequences. Transformants with the isolated plasmids had a phosphoglucose isomerase activity increased by a factor of 7. The cloned sequence hybridized to a constitutively synthesized 2.2 kb RNA in Northern analysis. The coding region includes a 2.05 kb EcoRI fragment common to all four inserts. A fragment including part of the PGI1 region was subcloned into vector YRp7 and used to induce integration at the PGI1 locus. Genetical and Southern analysis of stable transformants showed that single as well as tandem integration took place at this locus. This showed that the PGI1 gene had been isolated. Finally, and in contrast to the results of Kempe et al. (1974a, b) who reported three isoenzymes in yeasts, only one copy of the PGI1 gene per genome was found in several laboratory strains tested by Southern analysis.
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Communicated by C.P. Hollenberg
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Aguilera, A., Zimmermann, F.K. Isolation and molecular analysis of the phosphoglucose isomerase structural gene of Saccharomyces cerevisiae . Mol Gen Genet 202, 83–89 (1986). https://doi.org/10.1007/BF00330521
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DOI: https://doi.org/10.1007/BF00330521