Additional file 11 .

Biosynthesis of phenolic moiety of secoiridoids. The biosynthetic pathway for the production of oleuropein and 3,4-DHPEA-EDA in Olea europaea, according to Ryan et al.[8], is reported. First p-hydroxyphenylalanine (tyrosine) is deaminated and oxidised by the enzyme amine oxidase to form p-hydroxyphenylpyruvic acid. Subsequently, p-hydroxyphenylacetic acid is generated through the decarboxylation of p-hydroxyphenylpyruvic acid. By reduction of p-hydroxyphenylacetic acid, p-hydroxyphenylethanol (tyrosol) is formed, and through a series of condensation reactions with oleoside, this product produces ligstroside, 3,4-DHPEA-EDA, and oleuropein.

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Alagna et al. BMC Plant Biology 2012 12:162   doi:10.1186/1471-2229-12-162