versicolorin B desaturase activity
Catalyzes the reaction: versicolorin B + NADPH + O2 = versicolorin A + NADP+ + 2 H2O. Uses heme-thiolate as a co-factor. Involved in the synthesis of aflatoxins in the fungus Aspergillus parasiticus.
GO:0016717
oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water
is_a