A carbon-13 biosynthetic study of stress metabolites from carrot roots: eugenin and 6-methoxymellein

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Abstract
Sodium [1,2-13C2]acetate was readily incorporated into the stress compounds 6-methoxymellein (I) and eugenin (III) after their formation in carrot roots was induced by treatment with ethrel. The complete incorporation patterns were revealed by 13C NMR spectroscopy and confirm a polyketide origin for both metabolites. In the formation of the heterocycle of eugenin, 2 different C atoms are utilized to the same extent. This implies that an intermediate on the biosynthetic pathway is not firmly enzyme bound.

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