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We constructed a 7.9-kilobase-pair recombinant shuttle plasmid, designated pHR106, by combining desired segments of three plasmids: an Escherichia coli plasmid (pSL100) which provides a multiple cloning site, a Clostridium perfringens plasmid (pJU122) which provides a clostridial origin of replication, and an E. coli plasmid (pJIR62) which provides an E. coli origin of replication, an ampicillin resistance gene, and a chloramphenicol resistance gene of clostridial origin. The shuttle plasmid transformed E. coli HB101 with a frequency of 1 transformant per 10(4) viable cells and C. perfringens L-phase strain L-13 with a frequency of approximately 1 transformant per 10(6) viable cells. Because of the set of unique cloning sites and the chloramphenicol resistance marker, this shuttle plasmid should be particularly useful for studies of gene regulation and for enzyme production with C. perfringens.

Development of a new shuttle plasmid system for Escherichia coli and Clostridium perfringens