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- W2022337370 abstract "Abstract Transport of Ca 2+ in membrane vesicles of the cyanobacterium Anabaena variabilis has been investigated. The light membranes previously shown to carry a Mg 2+ -dependent, Ca 2+ -stimulated ATPase (Lockau, W. and Pfeffer, S. (1982) Z. Naturforsch. 37C, 658–664) accumulate Ca 2+ upon addition of ATP, whereas the (heavier) thylakoids do not. A stoichiometry of 0.3 Ca 2+ taken up per ATP hydrolyzed has been determined from initial rates, which is considered to be an underestimation of the true stoichiometry of the pump. Calcium transport and Ca 2+ -stimulated ATPase activity are both sensitive to Na 3 VO 4 (an inhibitor of ATPases forming a phosphorylated intermediate), show the same pH optimum and a comparable dependence on ATP concentration. Calcium transport is also supported by nucleoside triphosphates other than ATP, although at lower rates. Accumulation of calcium is abolished by an ionophore of divalent cations, ionophore A23187, but is resistant to ionophores of monovalent cations and to the inhibitor of F 1 -F 0 -type ATPases, N , N ′-dicyclohexylcarbodiimide. It is concluded that the ATPase is a primary calcium pump." @default.
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- W2022337370 date "1983-08-01" @default.
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- W2022337370 title "ATP-dependent calcium transport in membrane vesicles of the cyanobacterium, Anabaena variabilis" @default.
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- W2022337370 doi "https://doi.org/10.1016/0005-2736(83)90098-6" @default.
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