Inhibitors of the plasma membrane redox system of Zea mays L. roots. The vitamin K antagonists dicumarol and warfarin.

摘要: The action of the 4-hydroxycoumarins dicumarol and warfarin, antagonists probable vitamin K type components plasma membrane electron-transport system, on redox activity intact maize roots was compared. Both effectors inhibited electron transfer to extracellular hexacyanoferrate III. While effect strongly lipophilic system irreversible by rinsing, inhibition caused hydrophilic warfarin could be reverted completely exchange incubation medium. We take these results as possible evidence for integration into membrane. may confined enzymic sites freely accessible from aqueous apoplasmic solution.