Abstract
A bacteriophage-plasmid hybrid (phagemid) designated pCAK1 was constructed by ligating 5-kbp Escherichia coli plasmid pAK102 (AprEmr) and the 6.6-kbp HaeIII-linearized replicative form of the CAK1 viruslike particle from Clostridium acetobutylicum NCIB 6444. Phagemid pCAK1 (11.6 kbp) replicated via the ColE1 replication origin derived from pAK102 in E. coli. Single-stranded DNA (ssDNA) molecules complexed with protein in a manner which protected ssDNA from nucleases were recovered from the supernatant of E. coli DH11S transformants containing pCAK1 in the absence of cell lysis. This suggests that the viral-strand DNA synthesis replication origin of CAK1 and associated gene expression are functional in E. coli DH11S. The single-stranded form of pCAK1 isolated from E. coli supernatant was transformed into E. coli DH5 alpha' or DH11S by electroporation. Isolation of ampicillin-resistant E. coli transformants following transformation suggests that the complementary-strand DNA synthesis replication origin of CAK1 is also functional in E. coli. The coat proteins associated with ssDNA of pCAK1 demonstrated sensitivity to proteinase K and various solvents (i.e., phenol and chloroform), similar to the results obtained previously with CAK1. Following phagemid construction in E. coli, pCAK1 was transformed into C. acetobutylicum ATCC 824 and C. perfringens 13 by intact cell electroporation. Restriction enzyme analysis of pCAK1 isolated from erythromycin-resistant transformants of both C. acetobutylicum and C. perfringens suggested that it was identical to that present in E. coli transformants.
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