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Summary Although Lactobacillus plant arum has been isolated in large numbers from ripenedcheeses, the knowledge of its proteolytic system is very limited. This study was undertaken with the aim of obtaining a clearer picture of the peptide hydrolases of sorne L. plantarum strains. A comparison with the closely related species L. casei was also considered. The intracellular peptide hydrolase system of L. plantarum consists of aminopeptidase and dipeptidase activities in addition to a general activity on whole casein and ~-lactoglobulin. The electrophoretic pattern showed that it possesses one non-specifie aminopeptidase and three dipeptidases. By comparison L. casei aminopeptidase was very similar. This latter bacterium showed only one dipeptidase. Intraceliular extracts of L. plantarum are able to hydrolyse aSIand ~-casein. The formation of two peptides of higher mobility than casein was detected. It should be noticed that although similarities were found between the different strains of a sorne species on the type of enzyme, significant differences in the level of specifie activities were detected. In opposite to L. casei, L. plantarum does not possess carboxypepti

The intracellular peptide-hydrolases of Lactobacillus plantarum. Comparison with Lactobacillus casei