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salutaridine synthase (PsSAS), salutaridine reductase (PsSAR) and salutaridinol acetyltransferase (PsSAT) are functionally coexpressed in Saccharomyces cerevisiae and optimization of the pH conditions allowed for productive spontaneous rearrangement of salutaridinol-7-O-acetate and synthesis of thebaine from (R)-reticuline. A 7-gene pathway for the production of codeine and morphine from (R)-reticuline is reconstituted. Yeast cell feeding assays using (R)-reticuline, salutaridine or codeine as substrates show that all enzymes are functionally coexpressed in yeast and that activity of salutaridine reductase and codeine-O-demethylase likely limit flux to morphine synthesis. The results of this study describe a significant advance for the synthesis of morphinans in Saccharomyces cerevisiae and pave the way for their complete synthesis in recombinant microbes