Abstract
We showed that in the yeast Schizosaccharomyces pombe, fructose-bisphosphatase is not subject to catabolite inactivation as it was observed in Saccharomyces cerevisiae. However, this enzyme activity is sensitive to catabolite repression in both yeasts. Two mutants lacking completely fructose-bisphosphatase activity were found. They were unable to grow on glycerol medium. They were still respiratory competent and exhibited the ability to derepress partially malate dehydrogenase activity. In glucose exponential phase culture, the parental strain lacks completely the fructosebisphosphatase activity due to catabolite repression. In these conditions, the growth is slowed down only in the mutants eventhough both mutants and their parental strain lack this enzyme activity. Normal sporulation and poor spore germination were observed for one mutant whereas, only in the presence of glucose, normal sporulation and normal spore germination were observed for the second mutant. Mendelian segregation of glycerol growth was found for the well germinating mutant. It is of nuclear heredity. The two mutations appeared to be closely linked.
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Abbreviations
- FBPase:
-
Fructose-1,6-bisphosphatase
- fbp - :
-
genetic symbol for FBPase deficiency
- glr - :
-
symbol for inability to grow on glycerol
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A. M. Colson is Research Associate au Fonds National de la Recherche Scientifique
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Vassarotti, A., Boutry, M. & Colson, AM. Fructose-bisphosphatase-deficient mutants of the yeast Schizosaccharomyces pombe . Arch. Microbiol. 133, 131–136 (1982). https://doi.org/10.1007/BF00413526
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DOI: https://doi.org/10.1007/BF00413526