Catalyzes the oxygenation of the 6-position of protodeoxyviolaceinate to form proviolacein. H(+) + NADH + O2 + protodeoxyviolaceinate = H2O + NAD(+) + protoviolaceinate H(+) + NADPH + O2 + protodeoxyviolaceinate = H2O + NADP(+) + protoviolaceinate Pigment biosynthesis; violacein biosynthesis. By N-acylhomoserine lactone (AHL). Violacein production is used as a biosensor for the detection of quorum-sensing AHL production. Violacein possesses antibacterial, antiviral, antimicrobial, antileishmanial, trypanocidal and potential antitumoral activities.