Involved in the control of flavonoid biosynthesis in fruits, probably by binding directly to natural flavonoids (PubMed:19969523). Binds the natural flavonoid catechin with affinities in the low micromolar range (PubMed:24133217). Monomer (PubMed:24133217). Interacts with AP (PubMed:28656626). Highly expressed in open flowers (PubMed:19969523). Expressed in roots, leaves and flower buds (PubMed:19969523). Expressed at low levels in ripe red fruits (PubMed:19969523). May cause an allergic reaction in human (PubMed:27086707). Binds to IgE of patients allergic to birch Bet v 1 (PubMed:27086707). Causes degranulation of basophils sensitized with IgE of patients allergic to birch Bet v 1 (PubMed:27086707). Fruits silencing FRAA3 exhibit loss of pigmentation in mature fruits due to the lack of anthocyanin biosynthesis. Belongs to the BetVI family.