New cloning vectors were prepared with the aid of a large plasmid isolated from Acetobacter pasteurianus and from plasmids pBR322 and pUC4-KAPA. Of the prepared cloning vectors, pACK5 contains a gene coding for kanamycin resistance, pACT7 and pACT71 contain a gene coding for tetracycline resistance and vector pACG3 with a gene coding for both kanamycin and tetracycline resistance. The vectors prepared only contained the beginning of replication from the pAC1 plasmid and possessed the ability to replicate within E. coli and A. pasteurianus. The vectors are highly stable in both strains and during the 5-d cultivation under nonselective conditions are not eliminated.

Department of Biochemistry Faculty of Science Comenius University Bratislava Czechoslovakia

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