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  • Title: ATP-dependent Ca2+ transport in vesicles isolated from the bile canalicular region of the hepatocyte plasma membrane.
    Author: Bachs O, Famulski KS, Mirabelli F, Carafoli E.
    Journal: Eur J Biochem; 1985 Feb 15; 147(1):1-7. PubMed ID: 3156034.
    Abstract:
    Three plasma membrane subfractions have been isolated and characterized from rat liver cells. The high affinity Ca2+-stimulated ATPase is highly enriched in the bile canalicular subfraction. Taking into account cross-contamination by the blood sinusoidal and lateral membranes it is suggested that the high-affinity Ca2+-ATPase is located exclusively in this fraction. The high-affinity Ca2+-ATPase is coupled to Ca2+ transport, is calmodulin-insensitive, sensitive to vanadate under appropriate experimental conditions and is strongly inhibited by La3+. In the presence of Ca2+ and ATP the ATPase forms a phosphorylated intermediate of molecular mass about 200 kDa.
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