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• W2034268622 abstract "Abstract The distribution of ATPase activity has been studied in pig platelets subcellular fractions prepared by sucrose density gradient centrifugation. ATPase activities in the presence of Ca 2+ have been measured and the effect of monovalent cations, of ouabain, 2,4-dinitrophenol and Salyrgan investigated. ATPase activity was present in the soluble phase and in the membrane and granule fractions of the cell. The mean ratios for Ca 2+ /Mg 2+ activity being 2.6, 0.62 and 0.60 in these fractions. A large proportion of this divalent cation-activated ATPase can be accounted for by the contractile proteins by the platelet. The Mg 2+ -ATPase of the granular fraction could be stimulated by 2,4-dinitrophenol. The effects of additions of Na + and K + and ouabain over a range of concentrations were most variable and the presence of a Mg 2+ -activated (Na + + K + )-ATPase in the cell could not be unequivocally demonstrated. High monovalent cation concentration (approx. 200 mM) showed a more consistent effect. Homogenate Mg 2+ -ATPase was stimulated by high levels of Na + or K + , Ca 2+ -ATPase, however, was only slightly increased by 100 mM Na + and very markedly by 200 mM K + . A similar effect with 200 mM K + was observed with all the subcellular fractions. The Ca 2+ -ATPase of the membrane fraction could be increased for example, 2–3-fold by the addition of 200 mM K + . Salyrgan was found to inhibit the ATPase activities of all fractions and the soluble phase activity was almost completely inhibited by this agent in the presence of either bivalent cation. The granule fraction was the least sensitive to Salyrgan. The findings well illustrate the difficulties in identifying other minor ATPase enzymes in the presence of a large contractile protein ATPase component of wider distribution in the cell." @default.
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• W2034268622 date "1973-02-01" @default.
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• W2034268622 title "The subcellular distribution and characterisation of ATPase activity in pig platelets" @default.
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• W2034268622 doi "https://doi.org/10.1016/0005-2736(73)90476-8" @default.
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