Abstract

Recent developments have made the mesophilic lactic streptococci, widely used in dairy fermentations, accessible to genetic manipulation. Several host-vector systems have been described which currently are used in the cloning and expression of homologous and heterologous genes. The essential elements of these systems, the various cloning strategies and the first successful cloning experiments are described with emphasis on the molecular organization of proteinase genes. In addition, the organization and nucleotide sequence of signals which are involved in gene expression in lactic streptococci are summarized.

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