Antonie van Leeuwenhoek

, Volume 40, Issue 1, pp 93–102 | Cite as

Aspects of inorganic nitrogen assimilation in yeasts

  • Valerie J. Burn
  • Penelope R. Turner
  • C. M. Brown


Cultures of Candida utilis utilise glutamate in preference to ammonia and ammonia in preference to nitrate. The nitrate reductase of this organism is induced by nitrate and repressed in cultures grown on glutamate or ammonia. Nitrate-grown cultures of C. utilis, irrespective of the medium nitrate concentration, behave as though nitrogen-limited. In contrast to C. utilis, Saccharomyces cerevisiae utilises ammonia in preference to glutamate.

In eight yeasts studied the highest cellular contents of biosynthetic NADP-linked glutamate dehydrogenase were found in batch cultures containing low concentrations of ammonia or in nitrogen-limited chemostat cultures. NAD-linked glutamate dehydrogenase activity was detected in extracts of cells grown in the presence of glutamate but not in those grown in the presence of ammonia.


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Copyright information

© H. Veenman & Zonen B.V. 1974

Authors and Affiliations

  • Valerie J. Burn
    • 1
  • Penelope R. Turner
    • 1
  • C. M. Brown
    • 1
  1. 1.Department of MicrobiologyUniversity of Newcastle upon TyneNewcastle upon TyneEngland
  2. 2.Department of Biological SciencesUniversity of DundeeScotland

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