Nucleotide sequence for the catalytic domain of colicin E3 and its immunity protein. Evidence for a third gene overlapping colicin
- 1 January 1983
- journal article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 11 (11) , 3547-3557
- https://doi.org/10.1093/nar/11.11.3547
Abstract
We have determined the nucleotide sequence of a segment of Co1E3 DNA coding for the carboxyl-terminal, catalytic peptide of colicin E3 and for the immunity protein. The end of the colicin E3 gene is separated from the beginning of the immunity gene by a nine-basepair intercistronic region, suggesting the two genes are expressed as a single transcriptional unit. The immunity gene is expressed, however, in E. coli strains containing Co1E3-pBR322 hybrid plasmids deleted for the 5'-end of the colicin gene. The DNA sequence also contains an unexpected open reading frame (ORF). This ORF is contained within the colicin gene and is in the +1 reading frame with respect to that gene. Plasmids containing the ORF, directed the synthesis of an 11 kilodalton protein in a cell-free, transcription-translation system.Keywords
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