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ultramixer 3 crack free download ultramixer 2.2 crack free download ultramixer 2.2 crack free download ultramixer download full version ultramixer download full versionEvaluation of the temperature-dependent kinetic barrier of phosphoryl transfer in a quaternary structure of purine nucleoside phosphorylase from E. coli. The temperature-dependent kinetic barrier of phosphoryl transfer in a quaternary structure of E. coli purine nucleoside phosphorylase (EC 22.214.171.124) has been evaluated by stopped-flow measurements and [19F]NMR. The electrophilic 6-fluoropurine riboside (6-FPur) nucleotide was employed as the substrate and the nucleoside was found to be the obligatory product. At 25 degrees C the nucleoside phosphorylase catalyzed a slow irreversible reaction with a rate constant of 0.0033 s-1, increasing 1 order of magnitude in the temperature range from 25 to 45 degrees C. Stopped-flow experiments have shown that the nucleoside phosphorylase has a four-state activation-deactivation mechanism, with equilibrium constants of the individual steps being K1 = 3.0, K2 = 0.17, K3 = 0.009, and K4 = 0.00011. The values of the individual equilibrium constants are in agreement with the theoretical predictions of Eyring's theory. The barrier of phosphoryl transfer for nucleoside 6-FPur is estimated to be about -45 kJ/mol. The apparent activation energy (deltaG't) for nucleoside 6-FPur phosphoryl transfer is found to be -48 kJ/mol, indicating that the phosphoryl transfer is partially catalyzed by the formation of a stable transition state, formed by the attack of the active site phosphate on the beta-phosphorus of the substrate.
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