Proteinase activity of dairy Propionibacterium |
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Authors: | C Dupuis C Corre P Boyaval |
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Institution: | (1) Laboratoire de Recherches de Technologie Laitière, Institut National de la Recherche Agronomique, 65 rue de St-Brieuc, 35042 Rennes, France |
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Abstract: | A proteolytic system was found in all the species of dairy Propionibacterium. Two types of activities could act on 14C] \gb-casein or 14C] \gas1-casein. The first was the highest at the beginning of the exponential growth phase, tightly linked to the cells and hydrolysed preferably \gb-casein. The second was released at the end of growth and acted similarly on both substrates tested. This activity was located in the cell membrane of these cheese-ripening bacteria. The enzyme could be gently extracted from the cell by incubation in Ca2\s+ \t- or Mg Mg2\s+-free buffer. |
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