A transmembranous NADH-dehydrogenase in human erythrocyte membranes

Journal of Bioenergetics and Biomembranes
C GrebingK Hall

Abstract

Evidence is presented for a transmembranous NADH-dehydrogenase in human erythrocyte plasma membrane. We suggest that this enzyme is responsible for the ferricyanide reduction by intact cells. This NADH-dehydrogenase is distinctly different from the NADH-cytochrome b5 reductase on the cytoplasmic side of the membrane. Pretreatment of erythrocytes with the nonpenetrating inhibitor diazobenzene sulfonate (DABS) results in a 35% loss of NADH-ferricyanide reductase activity in the isolated plasma membrane. Since NADH and ferricyanide are both impermeable, the transmembrane enzyme can only be assayed in open membrane sheets with both surfaces exposed, and not in closed vesicles. The transmembrane dehydrogenase has affinity constants of 90 microM for NADH and 125 microM for ferricyanide. It is inhibited by p-chloromercuribenzoate, bathophenanthroline sulfonate, and chlorpromazine.

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Citations

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