Isolation and characterization of low molecular weight antimicrobial proteins from blue fox leukocytes (Alopex lagopus)
The aim of the research is to isolate and characterize low molecular weight antimicrobial proteins from acetic acid extracts from blue fox leukocytes. The research resulted in lysozyme with molecular mass 14634 Da having been isolated for the first time. Some functional characteristics of this protein were defined. pH optimum of enzymatic activity is 5,8, and minimum inhibitory concentration (MIC) against gram-positive bacterium Listeria monocytogenes is 6 μg/ml. Lysozyme was inactive against gram-negative bacterium Escherichia coli up to 2 mg/ml. Unknown protein with molecular weight 9035 Da presumably belonging to NK-lysins was isolated. It is characterized by high positive charge, the presence of three disulfide bonds and the lack of carbohydrate component. MIC against E. coli is 1,7 μg/ml, and MIC against L. monocytogenes is 2,4 μg/ml.
leukocytes, antimicrobial proteins and peptides, lysozyme, NK-lysin
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