Abstract
The study of the equilibrium of reactions catalyzed by thermostable enzymes is in demand for the development of biotechnological enzyme processes. The results of the analysis of equilibrium of transamination reaction catalyzed by thermostable transaminase from the archaeon Thermoproteus uzoniensis are presented below. A comparison of the conversion of substrates was performed for reactions with L-leucine and pyruvate and L-leucine and 2-oxobutyrate at 65°C. The establishment of the equilibrium was controlled by a decrease in the concentration of 2-oxobutyrate or pyruvate and by the accumulation of the keto analog of L-leucine. It was shown that the degree of conversion of L-leucine in the reaction with specific 2-oxobutyrate is higher than in the reaction with nonspecific pyruvate.
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