Component of 2-halobenzoate dioxygenase multicomponent enzyme system which catalyzes the incorporation of both atoms of molecular oxygen into 2-halobenzoate to form catechol. a 2-halobenzoate + H(+) + NADH + O2 = a halide anion + catechol + CO2 + NAD(+) Xenobiotic degradation; benzoate degradation via CoA ligation. Heterohexamer of 3 large (CbdA) subunits and 3 small (CbdB) subunits. The heterohexamer is part of 2-halobenzoate dioxygenase two component enzyme system. The other component is a NADH:acceptor reductase (CdbC). Belongs to the bacterial ring-hydroxylating dioxygenase beta subunit family.