ELECTROTRANSFORMATION OF CLOSTRIDIUM-BEIJERINCKII NRRL B-592 WITH SHUTTLE PLASMID PHR106 AND RECOMBINANT DERIVATIVES

Conditions for transformation of the solventogenic anaerobe Clostridiu m beijerinckii NRRL B-592 with plasmid DNA via electroporation are des cribed. Shuttle plasmid pHR106 and two derivatives constructed in this study were transferred and were expressed in this organism. One recom binant derivative of pHR106 was constructed by separately subcloning t he clostridial tetracycline (tetP) resistance genes into pHR106. The s econd vector conferring erythromycin resistance was obtained via in-vi vo recombination. The new constructs, termed pRZL and pRZE respectivel y, were then transferred to C. beijerinckii in order to evaluate their potential as shuttle vectors. The recombinant plasmids were shown to transfer to C. beijerinckii and were expressed as autonomously replica ting vectors. The use of these plasmids as cloning and shuttle vectors for C. beijerinckii is discussed.