Molybdo-flavoprotein enzyme complex involved in nicotine degradation. The subunit gamma (large subunit) contains the substrate-binding sites, the subunit alpha (medium subunit) binds FAD and the subunit beta (small subunit) has a 2Fe-2S ferredoxin-type domain which binds 2 2Fe-2S clusters. 6-hydroxypseudooxynicotine + A + H2O = 2,6-dihydroxypseudooxynicotine + AH2 Binds 1 FAD per subunit. Alkaloid degradation; nicotine degradation. Heterohexamer of 2 alpha (kdhA), 2 beta (kdhB) and 2 gamma (kdhC) subunit. Dimer of heterotrimers (Probable).