The beta subunit may be responsible for the substrate specificity of the enzyme. benzene + H(+) + NADH + O2 = cis-1,2-dihydrobenzene-1,2-diol + NAD(+) Aromatic compound metabolism; benzene degradation; catechol from benzene: step 1/2. This dioxygenase system consists of four proteins: the two subunits of the hydroxylase component (BedC1 and BedC2), a ferredoxin (BedB) and a ferredoxin reductase (BedA). Belongs to the bacterial ring-hydroxylating dioxygenase beta subunit family.