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Preferential inhibition of the plasma membrane NADH oxidase (NOX) activity by diphenyleneiodonium chloride with NADPH as donorThe cell-surface NADH oxidase (NOX) protein of plant and animal cells will utilize both NADH and NADPH as reduced electron donors for activity. The two activities are distinguished by a differential inhibition by the redox inhibitor diphenyleneiodonium chloride (DPI). Using both plasma membranes and cells, activity with NADPH as donor was markedly inhibited by DPI at submicromolar concentrations, whereas with NADH as donor, DPI was much less effective or had no effect on the activity. The possibility of the inhibition being the result of two different enzymes was eliminated by the use of a recombinant NOX protein. The findings support the concept that NOX proteins serve as terminal oxidases for plasma membrane electron transport involving cytosolic reduced pyridine nucleotides as the natural electron donors and with molecular oxygen as the electron acceptor.
Document ID
Document Type
Reprint (Version printed in journal)
Morre, D. James
(Purdue University West Lafayette, IN 47907-1333, United States)
Date Acquired
August 21, 2013
Publication Date
February 1, 2002
Publication Information
Publication: Antioxidants & redox signalling
Volume: 4
Issue: 1
ISSN: 1523-0864
Subject Category
Life Sciences (General)
Distribution Limits
Non-NASA Center
NASA Discipline Cell Biology

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