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The gene coding for the DOPA dioxygenase involved in betalain biosynthesis in Amanita muscaria and its regulation

Abstract

Genomic and cDNA clones derived from the gene (dodA) coding for DOPA dioxygenase, a key enzyme in the betalain pathway, were obtained from the basidiomycete Amanita muscaria. A cDNA library was established in the phage λZapII and dodA clones were isolated using polyclonal antibodies raised against the purified enzyme. Their identity was confirmed by comparison of the deduced amino acid sequence with the sequence of several tryptic peptide fragments of DOPA dioxygenase. The gene coded for a 228-amino acid protein that showed no homology to published sequences. The coding region was interrupted by five short introns. Regulation was shown to occur at the transcriptional level; the mRNA accumulated to high levels only in the coloured cap tissue. dodA was found to be a single-copy gene in A. muscaria. To our knowledge, this is the first gene from the betalain pathway to be cloned. It encodes a type of aromatic ring-cleaving dioxygenase that has not been previously described.

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Received: 13 January 1997 / Accepted: 18 April 1997

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Hinz, U., Fivaz, J., Girod, P. et al. The gene coding for the DOPA dioxygenase involved in betalain biosynthesis in Amanita muscaria and its regulation. Mol Gen Genet 256, 1–6 (1997). https://doi.org/10.1007/s004380050539

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  • Key wordsAmanita muscaria
  • Betalain
  • Extradiol ring-cleaving dioxygenase
  • Basidiomycete
  • Molecular cloning