Magnesium-independent aromatic prenyltransferase that catalyzes the irreversible transfer of a dimethylallyl group to 4-hydroxyphenylpyruvate to produce the ring A structure in the clorobiocin biosynthesis pathway. Clorobiocin is an aminocoumarin family antibiotic. 3-(4-hydroxyphenyl)pyruvate + dimethylallyl diphosphate = 3-dimethylallyl-4-hydroxyphenylpyruvate + diphosphate Antibiotic biosynthesis. Monomer. Cells lacking this gene produce antibiotic compounds (vanillobiocin, isovanillobiocin and declovanillobiocin) with a methoxy instead of the dimethylallyl group at the position 3 of the 4-hydroxybenzoic acid moiety of clorobiocin. Belongs to the aromatic prenyltransferase family.