Abstract
The properties of two extracellular proteases of Aspergillus ochraceus VKM F-4104D micromycete with plasmin-like activity have been studied. It has been shown that the enzymes differ in pI (5.05 and 6.83) and have similar molecular weights (about 32 and 35 kDa), pH optima (pH 9.0–10.00 at 45°C), and specificities of action on a limited set of chromogenic peptide substrates of trypsin-like proteases. According to inhibitory analysis, both enzymes belong to the serine proteases. Their properties appeared to be similar to those of the protease, protein C activator, which is the main proteolytic enzyme of A. ochraceus VKM F-4104D. Most likely, proteases of this micromyсetes are isoenzymes.
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