Protein expression in E. coli minicells by recombinant plasmids - PubMed

Protein expression in E. coli minicells by recombinant plasmids

R B Meagher et al. Cell. 1977 Mar.

Abstract

The polypeptides synthesized in E. coli minicells from recombinant plasmids containing DNA fragments from cauliflower mosaic virus, Drosophila melanogaster, and mouse mitochondria were examined. Molecularly cloned fragments of cauliflower mosaic virus DNA directed the synthesis of high levels of three polypeptides, which were synthesized entirely from within the cloned virus DNA fragments independent of their insertion into the plasmid vehicles. Several fragments of D. melanogaster DNA were capable of initiating polypeptide synthesis; however, termination of these polypeptides was dependent upon the insertion into the plasmid vehicle. The majority of D. melanogaster DNA fragments examined did not direct the detectable synthesis of any polypeptides. Insertion of DNA into the Eco RI site of ColE1 and pSC101 plasmids resulted in the altered expression of plasmid-encoded polypeptides. In the case of ColE1, this site of insertion lies within the colicin E1 structural gene, and insertion of foreign DNA into the site results in the synthesis of an inactive truncated colicin E1 molecule. It is probable that the Eco RI site in pSC101 lies within the structural gene for a polypeptide involved in tetracycline resistance, and insertion of DNA into this site may also result in the synthesis of a truncated or elongated polypeptide.

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