Novel technique for microbial production of 3,4-Dihydroxy Phenyl L-alanine by a mutant strain of Aspergillus oryzae

• Sikander Ali ^[1] ; Ikram ul-Haq ^[1] ; M.A. Qadeer ^[2]
  1. [1] Government College Faculty of Sciences Department of Botany
  2. [2] Thokar Niaz Baig Centre of Excellence in Molecular Biology
• Localización: Electronic Journal of Biotechnology, ISSN-e 0717-3458, Vol. 5, Nº. 2, 2002, págs. 2-3
• Idioma: inglés
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• Resumen

  • L-DOPA is a useful drug for Parkinson’s disease. This investigation deals with the biosynthesis of L-DOPA by parental (GCB-6) and mutant (UV-7) strains of Aspergillus oryzae. There was a marked difference between the mycelial morphology and pellet type of the parental and UV-irradiated mutant cultures. The mutant strain of Aspergillus oryzae UV-6 showed pellet-like mycelial morphology and improved tyrosinase activity. Mould mycelium was used for biochemical conversion of L-tyrosine to L-DOPA since tyrosinase is an intracellular enzyme. The mutant was found to give 3.72 folds higher production of L-DOPA than the parental strain. The comparison of kinetic parameters was also done which showed greater ability of the mutant to yield L-DOPA (i.e. Yp/x 32.73 mg/mg with parent and 95.71 mg/mg with mutant). When cultures grown for various incubation periods, were monitored for Qp, Qs and q p, there was significant enhancement (p<0.0025-0.005) in these variables by the mutant strain of Aspergillus oryzae UV-7 over GCB-6 on all the rates.