The ability of linoleyl hydroxamate to inhibit 5-lipoxygenase from pot
ato tubers has been studied. The compound inhibited the activity of th
e enzyme at concentrations as low as 10(-7) M. The effect was dose- an
d pH-dependent, and showed some relationship to the concentration of t
he substrate (linoleate). The extent of enzyme inhibition was not dete
rmined by the time of preincubation with linoleyl hydroxamate. The inh
ibitor was not oxidized by 5-lipoxygenase under aerobiosis.