Stereospecificity of pig kidney and pea seedling diamino oxidases on 2-methyl-1,4-diaminobutane

Diamine oxidase from pea seedlings (PDAO) oxidizes both (R)- and (S)-2-methylputrescine at the less hindered C-4, whereas pig-kidney diamine oxidase (KDAO) shows a dependence on the stereochemistry of the substrate, since the (R)-isomer is oxidized at C-1 and the (S)-isomer at the less hindered amino group at C-4.