Involved in iodate respiration (PubMed:32190953). Probably catalyzes the reduction of iodate (IO(3)(-)) to hypoiodous acid (HIO) and H(2)O(2), using a reduced cytochrome c as the electron donor (PubMed:32190953). Binds 1 [2Fe-2S] cluster per subunit. The iodate reductase (Idr) complex is composed of a molybdopterin-dependent iodate reductase (IdrA and IdrB subunits) and two associated peroxidases (IdrP1 and IdrP2). Specifically expressed under iodate-respiring conditions. Predicted to be exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven. Belongs to the AOX family.