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- W2005440282 abstract "N-Cyclohexyl-N′-(dimethylamino)-carbodiimide (NCD-4) labels three sites in the sarcoplasmic reticulum Ca-ATPase which can be resolved by their spectral properties and by their effects on the catalytical activity of the enzyme. One site is not protectable by Ca2+ ions or by dicyclohexylcarbodiimide and is not essential for catalytical activity. Two Ca2+-protectable sites, whose modification leads to a biphasic inhibition of Ca-ATPase activity, have fluorescence emission maxima at 407 nm and 425 nm. The Ca-ATPase modified by NCD-4 hydrolyses ATP but does not translocate Ca2+ nor does it undergo the conformational changes associated with Ca2+ binding in the native enzyme. High concentrations of Ca2+ induce slow biphasic fluorescence quenching in the Ca-ATPase labeled selectively at the 407-nm site but the signals are largely abolished by modification of the 425-nm site. Both vanadate ions and ATP reverse this Ca2+-induced fluorescence quenching. It is proposed that NCD-4 labels the two high-affinity Ca2+-binding sites of the Sarcoplasmic reticulum Ca-ATPase and that the conformational changes in the modified enzyme may reflect interactions between the two sites." @default.
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- W2005440282 date "1985-10-01" @default.
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- W2005440282 title "Spectral and catalytical properties of the sarcoplasmic reticulum Ca-ATPase labeled with N-cyclohexyl-N'-(4-dimethylamino-1-naphthyl)-carbodiimide" @default.
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- W2005440282 doi "https://doi.org/10.1111/j.1432-1033.1985.tb09166.x" @default.
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