Horseradish peroxidase-catalyzed oligomerization of ferulic acid on a template of a tyrosine-containing tripeptide |
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Authors: | Oudgenoeg Gideon Dirksen Eef Ingemann Steen Hilhorst Riet Gruppen Harry Boeriu Carmen G Piersma Sander R van Berkel Willem J H Laane Colja Voragen Alphons G J |
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Affiliation: | Centre for Protein Technology TNO-WU, Bomenweg 2, 6700 EV Wageningen, The Netherlands. |
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Abstract: | Ferulic acid (FA) is an abundantly present phenolic constituent of plant cell walls. Kinetically controlled incubation of FA and the tripeptide Gly-Tyr-Gly (GYG) with horseradish peroxidase and H2O2 yielded a range of new cross-linked products. Two predominant series of hetero-oligomers of FA linked by dehydrogenation to the peptidyl tyrosine were characterized by electrospray ionization (tandem) mass spectrometry. One series comprises GYG coupled with 4-7 FA moieties linked by dehydrogenation, of which one is decarboxylated. In the second series 4-9 FA moieties linked by dehydrogenation, of which two are decarboxylated, are coupled to the tripeptide. A third series comprises three hetero-oligomers in which the peptidyl tyrosine is linked to 1-3 FA moieties of which none is decarboxylated. Two mechanisms for the formation of the FA-Tyr oligomers that result from the dualistic, concentration-dependent chemistry of FA and their possible role in the regulation of plant cell wall tissue growth are presented. |
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