Summary
The fdp mutation has been localized on the genome of Saccharomyces carlsbergensis, on chromosome II, between lys2 and tyr1, at a map distance of 31 centimorgan from lys2.
Since the fdp mutant does not grow on glucose, fructose, mannose and sucrose, hexose transport and a number of enzymes of carbon metabolism were tested, but no significant differences could be found between the wild type and the mutant. Only the regulatory properties of glycogen synthetase are changed in the mutant, but it is doubtfull whether this can explain its phenotype.
The disorganization of carbon metabolism of the mutant upon addition of glucose to the medium was analyzed in more detail. The most prominent feature observed until now is the accumulation of free glucose and hexose phosphates in the cell. This result indicates that somehow the feedback control between hexose transport and metabolism is impaired. Hexose phosphates are known to be toxic to many cells, including yeast. Therefore, accumulation of hexose phosphates in the presence of glucose in the medium, can explain the absence of growth on this carbon source.
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Communicated by F. Kaudewitz
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van de Poll, K.W., Schamhart, D.H.J. Characterization of a regulatory mutant of fructose 1,6-bisphosphatase in Saccharomyces carlsbergensis . Molec. Gen. Genet. 154, 61–66 (1977). https://doi.org/10.1007/BF00265577
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DOI: https://doi.org/10.1007/BF00265577