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- W2953671838 abstract "Distribution of phosphatidylserine (PS) in the erythrocyte membrane is essential for its activity. Flippase transports phospholipids from the outer to the inner leaflet of the lipid bilayer and maintains asymmetric distribution of phospholipids in the plasma membrane. ATP11C, a flippase, catalyzes PS flipping at the plasma membrane in association with cell cycle control protein 50A (CDC50A). ATP11C T418 N mutation causes 90% decrease in erythrocyte PS-flippase activity. However, the mechanism of the activity reduction remains unknown. To study the endogenous expression of ATP11C in erythrocytes, we produced a monoclonal antibody against human ATP11C. Immunoblotting analyses with this antibody revealed the absence of ATP11C in erythrocyte membranes derived from a patient with the T418 N mutation. Transiently expressed ATP11C wild-type in cultured cells localized in the cell membranes in the presence of CDC50A. Contrastingly, ATP11C T418 N mutants stacked at the endoplasmic reticulum (ER) even in the presence of CDC50A, suggesting improper intracellular trafficking. Expression of the T418 N mutant in cultured cells was lower than that in the wild-type. However, reduced expression of the T418 N mutant was partially restored by treatment with proteasome inhibitors, suggesting ER-associated degradation of the mutant protein. Cells expressing T418 N did not show flippase activity at the plasma membrane. These data show that the loss of PS-flippase activity in erythrocytes carrying ATP11C T418 N mutation is due to impaired enzymatic activity, improper membrane trafficking, and increased proteasome degradation." @default.
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- W2953671838 date "2019-08-01" @default.
- W2953671838 modified "2023-09-26" @default.
- W2953671838 title "ATP11C T418N, a gene mutation causing congenital hemolytic anemia, reduces flippase activity due to improper membrane trafficking" @default.
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- W2953671838 doi "https://doi.org/10.1016/j.bbrc.2019.06.092" @default.
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