Abstract
The biosynthesis of humulone, an antibacterial bitter acid from hops, was studied by isotope-incorporation experiments using (13)C-labelled glucose or (2)H(2)O. (13)C enrichments, (2)H enrichments and (13)C(13)C coupling patterns identify isovaleryl-CoA, malonyl-CoA and dimethylallyl pyrophosphate as precursors for humulone. Dimethylallyl pyrophosphate, which serves as a building block for the bitter acid, is generated via the deoxyxylulose pathway of terpenoid biosynthesis. The data confirm that a symmetrical intermediate is involved in humulone formation.
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