Abstract
A study of enzyme profiles in Hansenula polymorpha grown on various carbon substrates revealed that the synthesis of the methanol dissimilatory and assimilatory enzymes is regulated in the same way, namely by catabolite repression and induction by methanol. Mutants of H. polymorpha blocked in dihydroxyacetone (DHA) synthase (strain 70 M) or DHA kinase (strain 17 B) were unable to grow on methanol which confirmed the important role attributed to these enzymes in the biosynthetic xylulose monophosphate (XuMP) cycle. Both mutant strains were still able to metabolize methanol. In the DNA kinase-negative strain 17 B this resulted in accumulation of DHA. Although DHA kinase is thought to be involved in DHA and glycerol metabolism in methylotrophic yeasts, strain 17 B was still able to grow on glycerol at a rate similar to that of the wild type. DHA on the other hand only supported slow growth of this mutant when relatively high concentrations of this compound were provided in the medium. This slow but definite growth of strain 17 B on DHA was not based on the reversible DHA synthase reaction but on conversion of DHA into glycerol, a reaction catalyzed by DNA reductase. The subsequent metabolism of glycerol in strain 17 B and in wild type H. polymorpha, however, remains to be elucidated.
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Abbreviations
- XuMP:
-
xylulose monophosphate
- DHA:
-
dihydroxyacetone
- EMS:
-
ethyl methanesulphonate
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de Koning, W., Gleeson, M.A.G., Harder, W. et al. Regulation of methanol metabolism in the yeast Hansenula polymorpha . Arch. Microbiol. 147, 375–382 (1987). https://doi.org/10.1007/BF00406136
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DOI: https://doi.org/10.1007/BF00406136