Transgenic Research

, Volume 2, Issue 2, pp 84–92

Glucoamylase overexpression inAspergillus niger: Molecular genetic analysis of strains containing multiple copies of theglaA gene

Authors

  • Jan C. Verdoes
    • Department of Molecular Genetics and Gene-TechnologyTNO Medical Biological Laboratory
  • Peter J. Punt
    • Department of Molecular Genetics and Gene-TechnologyTNO Medical Biological Laboratory
  • Jaap M. Schrickx
    • Department of MicrobiologyVrije Universiteit, Biological Laboratory
  • Henk W. van Verseveld
    • Department of MicrobiologyVrije Universiteit, Biological Laboratory
  • Adriaan H. Stouthamer
    • Department of MicrobiologyVrije Universiteit, Biological Laboratory
  • Cees A. M. J. J. van den Hondel
    • Department of Molecular Genetics and Gene-TechnologyTNO Medical Biological Laboratory
Article

DOI: 10.1007/BF01969381

Cite this article as:
Verdoes, J.C., Punt, P.J., Schrickx, J.M. et al. Transgenic Research (1993) 2: 84. doi:10.1007/BF01969381

Abstract

A strategy, based on the usage of theamdS selection marker and a cosmid vector containing four copies of the glucoamylase gene (glaA), was developed to obtain glucoamylase (GLA)-overproducingA. niger strains. With this strategy, fungal strains carrying up to 200 copies of theglaA gene could be isolated at a relatively high frequency. In each transformant analysed, integration occurred in a single chromosome. A significant increase in the extracellular GLA production was observed in most of the transformants carrying multiple copies of theglaA gene. Further analysis showed that the amount of GLA that is produced was not proportional to the number ofglaA copies in these transformants. However, the level of GLA production clearly correlated with the amount ofglaA mRNA produced in these transformants. From these results it is concluded that GLA production is limited at the level of transcription.

Keywords

transcription regulationregulatory proteinamdS selection markercosmid vectorCHEF analysis

Copyright information

© Chapman & Hall 1993