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• W1489805578 abstract "Derivation of a steady-state rate equation for the aminoacyl-tRNA synthetases is described, and its suitability for the analysis of various details of the reaction is tested. The equation is applied to the magnesium and spermidine dependences of the isoleucyl-tRNA synthetase reaction. Earlier work [Airas, R.K. (1990) Eur. J. Biochem. 192, 401-409] is expanded by experiments and calculations of the tRNA kinetics. The analysis suggests the following new details in addition to the earlier results: (a) The binding of tRNA to the enzyme (and not only the rate of the aminoacylation reaction) is affected by the presence of the Mg2+ and spermidine in the tRNA molecule. At least two bound Mg2+ or spermidines are required. (b) tRNA and PPi partly inhibit the binding of each other to the enzyme. (c) The transfer reaction is rather slow, and, at least under some conditions, it participates in rate limitation. (d) A Mg(2+)-induced reduction in the aminoacylation rate seems to be directed to the dissociation of the aminoacyl-tRNA from the enzyme. This dissociation rate is enhanced if a Mg2+ is first dissociated from the enzyme or tRNA. An increase in the Mg2+ concentration shifts the rate limitation from the transfer reaction towards dissociation of the product." @default.
• W1489805578 created "2016-06-24" @default.
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• W1489805578 date "1992-12-01" @default.
• W1489805578 modified "2023-09-27" @default.
• W1489805578 title "Analysis of the isoleucyl-tRNA synthetase reaction by total rate equations. Magnesium and spermidine in the tRNA kinetics" @default.
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• W1489805578 doi "https://doi.org/10.1111/j.1432-1033.1992.tb17440.x" @default.
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