Binds 1 [2Fe-2S] cluster. Binds 1 Fe cation. Xenobiotic degradation; toluene degradation. This dioxygenase system consists of three proteins: the two subunits of the hydroxylase component (XylX and XylY), and an electron transfer component (XylZ). Belongs to the bacterial ring-hydroxylating dioxygenase alpha subunit family.