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• W1996060070 abstract "The binding of Ca2+ and Mg2+ to tRNAPhe is analyzed by equilibrium titrations and temperature-jump measurements using the Wye base fluorescence as a label. Titration experiments starting with the folded structure of the tRNA (high salt and low temperature) show that Ca2+ and Mg2+ binding detected by Wye base fluorescence changes is associated with equilibrium constants between 1 x 10(3) and 3 x 10(3) M-1. The binding of Ca2+ leads to an increase of the relaxation time associated with a conformation change of the anticodon loop and to a decrease of the corresponding amplitude. These data are represented quantitatively by a two-step reaction scheme with a preferential binding of Ca2+ to one of the anticodon conformations. When Mg2+ is added, an extra relaxation process is observed with time constants around 1 ms. This process demonstrates the formation of a Mg2+ inner sphere complex. Relaxation time constants and amplitudes are represented quantitatively by a three-step reaction scheme. Mg2+ binds preferentially to one of the anticodon conformations. In the absence of Mg2+, these conformations are populated almost equally with a transition rate constant around 5 x 10(3) s-1. The Mg2+ inner sphere complex is formed with a relatively low rate constant of (1--2) x 10(3) s-1, indicating a conformational barrier. These data strongly suggest that the Mg2+ site analyzed in the present investigation corresponds to the anticodon site with a distorted octahedral coordination characterized by X-ray analysis. The results are discussed in terms of the anticodon function and also with respect to their implications upon Mg2+ binding to nucleic acids in general." @default.
• W1996060070 created "2016-06-24" @default.
• W1996060070 creator A5068453737 @default.
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• W1996060070 date "1982-01-05" @default.
• W1996060070 modified "2023-10-16" @default.
• W1996060070 title "Magnesium ion inner sphere complex in the anticodon loop of tRNAPhe" @default.
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• W1996060070 doi "https://doi.org/10.1021/bi00530a009" @default.
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