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• W1967217192 endingPage "7026" @default.
• W1967217192 startingPage "7016" @default.
• W1967217192 abstract "The effects of minor differences in the amino acid sequences between a vertebrate (bovine testes) and an invertebrate (octopus) calmodulin on metal ion binding were investigated via laser-induced Eu3+ and Tb3+ luminescence. Amino acid substitutions at residues which are coordinated to the metal ion do not produce any detectable changes in the 7F0----5D0 excitation spectrum of the Eu3+ ion bound to octopus calmodulin relative to bovine testes calmodulin; only minor differences in the excited-state lifetime values in D2O solution are observed. The dissociation constants for Eu3+ (1.0 +/- 0.2 microM) and Tb3+ (5 +/- 1 microM) from the weak lanthanide binding sites (III and IV, numbered from the amino terminus) of octopus calmodulin were measured using luminescence techniques. Both values agree well with those reported previously for bovine testes calmodulin [Mulqueen, P. M., Tingey, J. M., & Horrocks, W. D., Jr. (1985) Biochemistry 24, 6639-6645]. The measured dissociation constant of Eu3+ bound in the tight lanthanide binding sites (I and II) is 6 +/- 2 nM for octopus calmodulin and 12 +/- 2 nM for bovine testes calmodulin. The distances between sites I and II (12.4 +/- 0.5 A) and sites III and IV (11.7 +/- 0.8 A) were determined from Förster-type energy transfer in D2O solutions of octopus calmodulin containing bound Eu3+ donor and Nd3+ acceptor ions. Förster theory parameters for nonradiative energy transfer between Tyr138 and Tb3+ ions bound at sites III and IV of octopus calmodulin were comprehensively evaluated, including a dynamics simulation of the orientation factor kappa 2. This theory is found to account quantitatively for the observed energy-transfer efficiency as evaluated from the observed sensitized Tb3+ emission." @default.
• W1967217192 created "2016-06-24" @default.
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• W1967217192 creator A5031191987 @default.
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• W1967217192 date "1992-08-11" @default.
• W1967217192 modified "2023-09-24" @default.
• W1967217192 title "Europium(III) luminescence and tyrosine to terbium(III) energy-transfer studies of invertebrate (octopus) calmodulin" @default.
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• W1967217192 doi "https://doi.org/10.1021/bi00146a002" @default.
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