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Genes for the fermentation of maltose and α-methylglucoside in Saccharomyces carlsbergensis

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Summary

  1. 1.

    Saccharomyces carlsbergensis N.C.Y.C.74 was shown to be diploid and heterothallic. On acetate medium four spored asci were produced with a spore viability of no more than 2%. However diploid hybrids from the viable spores yielded asci with a spore viability of 75%, thus making tetrad analysis and consequently a genetical study of sugar fermentation in this strain feasible.

  2. 2.

    Auxotrophic mutants in a haploid derivative of this strain were obtained, some of which could be classified as ade 1, ade 2, ade 4, ade 5, ade 6, ade 7, ura 2, ura 3, lys 1, trp 2, trp 5, his 4 and his 5.

  3. 3.

    150 Random spores all fermented glucose, sucrose, mannose, galactose, melibiose, raffinose, and maltose, but only 28% fermented α-methylglucoside. The same fermentation pattern was found in petites of these 150 spores, except that 40% grew poorly on galactose; this gal phenotype could not be ascribed to a single gene.

  4. 4.

    In crosses with mal strains the maltose fermenting ability of the spores from S. carlsbergensis appeared to be dependent upon 1 single gene, which could be identified as MAL 6, one of the 7 known polymeric genes for maltose fermentation in Saccharomyces.

  5. 5.

    Our strain was found to be heterozygous for 2 unlinked MGL genes, in this paper indicated as MGL a, and MGL b, both indispensable for the fermentation of α-methylglucoside.

  6. 6.

    After mutagenesis of a haploid strain with genotype MGL aMGLb, one mgl mutant was found, which complemented a strain with genotype mgl amglb. This third indispensable MGL gene, preliminarily called MGL c, is homozygously present in our strain and is not linked to either MGL a or MGL b.

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Communicated by F. Kaudewitz

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ten Berge, A.M.A. Genes for the fermentation of maltose and α-methylglucoside in Saccharomyces carlsbergensis . Molec. Gen. Genet. 115, 80–88 (1972). https://doi.org/10.1007/BF00272220

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