label: versicolorin B desaturase activity
label_lc: versicolorin b desaturase activity
description: "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."