Applied Microbiology and Biotechnology

, Volume 71, Issue 4, pp 486–492

Expression of the urease gene of Agaricus bisporus: a tool for studying fruit body formation and post-harvest development

Authors

  • Matthijs J. M. Wagemaker
    • Department of MicrobiologyIWWR Radboud University Nijmegen
  • Daniel C. Eastwood
    • Fungal Biotechnology GroupWarwick HRI
  • Chris van der Drift
    • Department of MicrobiologyIWWR Radboud University Nijmegen
  • Mike S. M. Jetten
    • Department of MicrobiologyIWWR Radboud University Nijmegen
  • Kerry Burton
    • Fungal Biotechnology GroupWarwick HRI
  • Leo J. L. D. Van Griensven
    • Wageningen URPlant Research International B.V.
    • Department of MicrobiologyIWWR Radboud University Nijmegen
Applied Genetics and Molecular Biotechnology

DOI: 10.1007/s00253-005-0185-5

Cite this article as:
Wagemaker, M.J.M., Eastwood, D.C., van der Drift, C. et al. Appl Microbiol Biotechnol (2006) 71: 486. doi:10.1007/s00253-005-0185-5

Abstract

Fruit body initials of Agaricus bisporus contain high levels of urea, which decrease in the following developmental stages until stage 4 (harvest) when urea levels increase again. At storage, the high urea content may affect the quality of the mushroom, i.e. by the formation of ammonia from urea through the action of urease (EC 3.5.1.5). Despite the abundance of urea in the edible mushroom A. bisporus, little is known about its physiological role. The urease gene of A. bisporus and its promoter region were identified and cloned. The coding part of the genomic DNA was interrupted by nine introns as confirmed by cDNA analysis. The first full homobasidiomycete urease protein sequence obtained comprised 838 amino acids (molecular mass 90,694 Da, pI 5.8). An alignment with fungal, plant and bacterial ureases revealed a high conservation. The expression of the urease gene, measured by Northern analyses, was studied both during normal development of fruit bodies and during post-harvest senescence. Expression in normal development was significantly up-regulated in developmental stages 5 and 6. During post-harvest senescence, the expression of urease was mainly observed in the stipe tissue; expression decreased on the first day and remained at a basal level through the remaining sampling period.

Copyright information

© Springer-Verlag 2005