2,6-dihydroxypseudooxynicotine hydrolase  2,6-dihydroxypseudooxynicotine hydrolase () is an enzyme with systematic name "1-(2,6-dihydroxypyridin-3-yl)-4-(methylamino)butan-1-one hydrolase". This enzyme catalyses the following chemical reaction  The enzyme is present in the soil bacterium "Arthrobacter nicotinovorans".