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Variants ofStreptococcus lactis that produce lactic acid slowly in milk were isolated by inducing plasmid loss in the wild type at 39 to 40 C. Such strains had lost most of their surface-bound proteinase activity and were designatedprt - . The specific proteinase activities ofS. lactis C10prt + whole cells and solubilized cell walls were 7 and 18 times, respectively, those of theprt - strain, but spheroplast lysates ofprt + andprt - strains contained similar proteinase activity.S. lactis H1 showed a similar relative distribution of activity betweenprt + andprt - cellular fractions, although the overall level was lower. The limited growth in milk, characteristic ofprt - strains, can be explained in terms of their low surface-bound proteinase activity.

Proteinase Activity in Slow Lactic Acid-Producing Variants of Streptococcus lactis