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- W1643169027 abstract "Nd3+ binding to sarcoplasmic reticulum (SR) was detected by inhibition of ATPase activity and directly by a fluorimetric assay. Both methods indicated that Nd3+ inhibited the ATPase activity by binding in the high-affinity Ca2+ binding sites. The stoichiometry of binding was about 11 nmol of Nd3+ bound per mg of SR proteins at pNd = 6.5. At higher [Nd3+], substantial nonspecific binding occurred. The association constant for Nd3+ binding to the high-affinity Ca2+ binding sites was estimated to be near 2 X 10(9) M-1. When the CaATPase was inactivated with fluorescein isothiocyanate (FITC), 5.3 nmol were bound per mg of SR protein. This fluorescent probe is known to bind in the ATP binding site. The stoichiometry of Nd3+ binding to FITC-labeled CaATPase was the same, within experimental error, as to the unlabeled CaATPase. Fluorescence energy transfer between FITC in the ATP site and Nd3+ in the Ca2+ sites was found to be very small. This donor-acceptor pair has a critical distance of 0.93 nm and the distance between the ATP site and the closest Ca2+ was estimated to be greater than 2.1 nm. Parallel measurements with FITC-labeled SR and Co2+, an acceptor with a critical distance 1.2 nm, suggested the ATP and Ca2+ binding sites are greater than 2.6 nm apart." @default.
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- W1643169027 date "1984-12-01" @default.
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- W1643169027 title "Nd3+ and Co2+ binding to sarcoplasmic reticulum CaATPase. An estimation of the distance from the ATP binding site to the high-affinity calcium binding sites." @default.
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- W1643169027 doi "https://doi.org/10.1016/s0021-9258(17)42652-4" @default.
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