[Effect of amino acids on exoprotease synthesis by Bacillus thuringiensis]статья

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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.

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[1] Egorov N. S., Loriia Z. K., Iudina T. G. [effect of amino acids on exoprotease synthesis by bacillus thuringiensis] // Прикладная биохимия и микробиология. — 1983. — Vol. 19, no. 5. — P. 610–6. The influence of certain L-amino acids and their mixtures on the synthesis of exoprotease from Bacillus thuringiensis was studied. Physiological experiments showed that the mixture of 20 amino acids added to the artificial medium repressed the synthesis of exoprotease. Among the compounds studied there are both the compounds which stimulate the synthesis of exoprotease (glutamic and aspartic acids, glycine), and the compounds which repress the synthesis of the enzyme (proline, tryptophane, tyrosine, asparagine, serine, cystein). None of the amino acids caused a change in the exoprotease activity. It has been assumed that the repression of the protease synthesis in the presence of the amino acids is accomplished by ammonium ions, which are formed when using the amino acids of Bac. thuringiensis. The glutamine synthetase activity of cells was determined during the growth of Bac. thuringiensis both on a medium containing triptone and after the addition of certain amino acids to the cell suspension. The correlation between the influence of different amino acids on the synthesis of exoprotease and the glutamine synthetase activity was demonstrated.

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