Isolation and characterization of a mutant strain of Streptococcus uberis, which fails to utilize a plasmin derived beta-casein peptide for the acquisition of methionine.

Abstract excerpt

AIMS: To isolate and characterize a mutant of Streptococcus uberis strain 0140J which fails to utilize a plasmin derived beta-casein peptide for the acquisition of methionine. METHODS AND RESULTS: Random insertional mutagenesis was used to isolate a mutant strain of Strep. uberis 0140J which was unable to utilize methionine from within a casein-derived peptide. The altered gene in the mutant strain showed...

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