Plasmid Profiles of Lactose-Negative and Proteinase-Deficient Mutants of Streptococcus lactis C10, ML3, and M18 |
| |
| Authors: | Steve A. Kuhl L. D. Larsen L. L. McKay |
| |
| Abstract: | Lactose- and proteinase-negative (Lac− Prt−) mutants of Streptococcus lactis C10, ML3, and M18 were isolated after treatment with ethidium bromide. The Lac− Prt− mutants of C10 were missing a 40-megadalton plasmid. A 33-megadalton plasmid was absent in the ML3 mutants, and the M18 variants lacked a 45-megadalton plasmid. The results suggest a linkage of these metabolic traits to the respective plasmids. The possible complexity of the interrelationship between lactose metabolism and proteinase activity is presented. |
| |
| Keywords: | |
|
|
