Binding to Cell Surfaces by Antibodies against ExoATPase

Rosenberg,; Cutler, Bruce S.; Gusovsky, T; Okuniewicz, J; Segal, Inbar; Sondag, J

doi:10.1159/000459264

Cited by 2 publications

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“…the summer months (10). The enzyme was later named an ecto-ATP diphosphohydrolase (ecto-ATPDase) 1 when it was shown to occur on the cell surface and to have the ability to hydrolyze both ATP and ADP (11).…”

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Chicken Oviductal Ecto-ATP-Diphosphohydrolase

Strobel

Nagy

Knowles

et al. 1996

Journal of Biological Chemistry

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An ecto-ATP diphosphohydrolase (ATPDase) was purified to homogeneity from vesiculosomes shed from chicken oviduct. First, the ecto-ATPDase-enriched vesiculosomes were concentrated by filtration, differential centrifugation, and exclusion chromatography. Next, the nonionic detergent, Nonidet P-40, was used to extract the ecto-ATPDase from vesiculosomal membranes, and the solubilized enzyme was further purified by ion exchange (DEAE-Bio-Gel) and lentil-lectin-Sepharose 4B chromatography. In the final stage, immunoaffinity chromatography was utilized to obtain purified ecto-ATPDase. More than 25,000-fold purification was achieved. Specific activity of the purified enzyme was greater than 800 mol/min/mg of protein with MgATP as the substrate, the highest ever reported for an ATPDase. The enzyme also hydrolyzed other nucleoside triphosphates in the presence of magnesium at similar rates and CaATP and MgADP at lower rates. The molecular mass of the purified glycoprotein was 80 kDa as determined by SDS-polyacrylamide gel electrophoresis and Western blot analysis. Based on its enzymatic properties, the relationship of the chicken oviduct ecto-ATPDase with other reported ATPDases and ecto-ATPases is discussed.The chicken oviduct has been used as a model system for studying secretion (1). Enzymes which are postulated to be involved in the egg formation process, such as an ecto-protein kinase (2), various phosphatases (3), and an ATPase have been investigated by Rosenberg et al. (4). The ATPase, first described by Haaland and Rosenberg (5), showed extensive kinetic similarities to the Mg 2ϩ

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confidence: 99%