Abstract
Glucosamine-6-phosphate (GlcN6P) deaminase seems to be the main enzyme in Aspergillus niger cells responsible for rapid glucosamine accumulation during the early stages of growth in a high-citric-acid-yielding medium. By determining basic kinetic parameters on the isolated enzyme, a high affinity toward fructose-6-phosphate (Fru6P) was measured, while in the reverse direction the K m value for glucosamine-6-phosphate was lower than deaminases from other organisms measured so far. The enzyme characteristics of GlcN6P deaminase suggest it must compete with 6-phosphofructo-1-kinase (PFK1) for the common substrate—Fru6P in A. niger cells. Glucosamine accumulation seems therefore to remove an intermediate from the glycolytic flux, a situation which is reflected in slower citric acid accumulation and a specific growth rate after the germination of spores. When ammonium ions are depleted from the medium, one of the substrates for GlcN6P deaminase becomes limiting and Fru6P can be catabolised by PFK1 which enhances glycolytic flux. Other enzymatic features of GlcN6P deaminase such as pH optima for both aminating and deaminating reactions might play a significant role in rapid glucosamine accumulation during the early phase of fermentation and a slow consumption of aminosugar during the citric-acid-producing phase.




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Acknowledgements
We thank Dr. Michael Mattey for critical reading of the manuscript. We are grateful to the DSM Research B.V., The Netherlands, for providing the A. niger GlcN6P deaminase nucleotide and deduced amino acid sequence prior to publishing the data on A. niger genome.
The work was supported by the Ministry of Higher Education, Science and Technology of the Republic of Slovenia.
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Šolar, T., Turšič, J. & Legiša, M. The role of glucosamine-6-phosphate deaminase at the early stages of Aspergillus niger growth in a high-citric-acid-yielding medium. Appl Microbiol Biotechnol 78, 613–619 (2008). https://doi.org/10.1007/s00253-007-1339-4
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DOI: https://doi.org/10.1007/s00253-007-1339-4


