Screening of Protease Producers Among Representatives of the Genus Bacillus Isolated from the Coastal Zone of the Kinburn Split
DOI:
https://doi.org/10.15407/microbiolj86.02.003Keywords:
Bacillus strains, Kinburn split, caseinolytic, elastolytic, fibrinolytic, fibrinogenolytic, and collagenase activitiesAbstract
Protease-producing representatives of Bacillus have been isolated from various environments such as the rhizosphere, soil, sewage, food, waste, and saline environments (sea water, marine sediments, hypersaline lakes, salty food, soda lakes, etc.). However, today, little is known about the characteristics of proteases in representatives of the genus Bacillus, isolated from the coastal and aquatic environments. In this regard, the purpose of this work was to screen for the presence of different types of proteolytic activity in Bacillus cultures isolated from the coastal zone of the Kinburn split. Methods. The objects of the study were 15 cultures (L1-L15), isolated from the dry grass of the coastal zone of the Kinburn spit (Mykolaiv region). The cultures were grown under conditions of deep cultivation at 28 °С, with a mixing speed of the nutrient medium of 230 rpm for 2 days. Methods of determining proteolytic (caseinolytic, elastolytic, fibrinolytic, fibrinogenolytic, and collagenase) activity in the culture liquid supernatant were used. Results. Study of the spectrum of proteolytic activities of 15 strains of Bacillus sp. showed that L9, L1, L2 and L4 exhibited higher levels of proteolytic activity compared to the other strains tested. Bacillus sp. L9 and L2 showed the highest elastase activity (35.80 and 33.80 U/mL, respectively), L1, L2, and L4 − fibrinogenolytic (12.50, 11.20 and 10.33 U/mL, respectively), and L1 and L4 − fibrinolytic (13.00 and 10.90 U/mL, respectively) activity. Conclusions. According to its catalytic properties, a number of representatives of Bacillus sp. isolated from the dry grass of the coastal zone of the Kinburn split may be promising for further research as producers of enzymes with elastotic, fibrinolytic, and fibrinogenolytic activities.
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