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Regulation of erythrocyte Ca2+ pump activity by protein kinase C

Regulation of erythrocyte Ca2+ pump activity by protein kinase C

Journal of Biological Chemistry 263(5): 2195-2202

ISSN/ISBN: 0021-9258

PMID: 2963001

Using either inside-out vesicles (IOV) prepared from human erythrocytes or purified Ca2+-ATPase from the same source, the effects of protein kinase C (Ca2+/phospholipid-dependent enzyme) on Ca2+ transport and Ca2+-ATPase activity were measured. Incubation of IOV with protein kinase C in the presence, but not absence, of either 12-O-tetradecanoylphorbol-13-acetate or diolein led to a Ca2+-dependent stimulation of ATP-dependent calcium uptake. The effect was a 5-7-fold increase of Vmax without a significant change in the apparent Km for Ca2+. By comparison, the effect of calmodulin was a 14-fold stimulation of Vmax and a 4-fold reduction in apparent Km. The effect of protein kinase C and calmodulin on Ca2+ uptake were nearly additive. Stimulation of IOV Ca2+ transport by protein kinase C was entirely reversible by treatment of activated IOV with alkaline phosphatase. Incubation of purified Ca2+-ATPase with protein kinase C in the presence of 12-O-tetradecanoylphorbol-13-acetate or diolein led to a stimulation of Ca2+-dependent ATPase activity. These results indicate that protein kinase C stimulates the activity of the plasma membrane Ca2+ pump by a direct effect on the pump protein.

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Accession: 018089878

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