The influence of different factors on the biosynthesis of extracellular proteolytic complexes by strains-producers Bacillus circulans 693, Bacillus sp. 27 and Yarrowia lipolytica 2061 at submerged cultivation has been investigated. It has been shown that ammonium hydrocarbonate and gelatin with glucose were optimum carbon and nitrogen sources for synthesis of proteolytic activity of B. circulans strain 693, gelatin with arabinose--for Bacillus sp. 27, gelatin and glycine with sorbose--for Y. lipolytica 2061. It has been established that the cultivation of producers on optimal sources of carbon and nitrogen increased protease activity of cultural liquid of B. circulans 693 3.8 times, Bacillus sp. 27--2.7 times, Y. lipolytica 2061--3.4 times. It has been found that the usage of different protein substrates in cultural medium permitted to obtain the proteolytic enzymes with various specificity with respect to globular and fibrillar proteins.
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