Abstract
The 6.2 kb ColE7-K317 plasmid was mapped and the DNA fragments of the colicin E7 operon subcloned into pUC18 and pUC19. The size of the functional colicin E7 operon deduced by subcloning was 2.3 kb. The colicin E7 gene product was purified by carboxymethylcellulose chromatography. Both colicin E7 and E9 were demonstrated to exhibit a non-specific DNAase-type activity by in vitro biological assay. The molecular mass of colicin E7 was 61 kDa, as determined by SDS-PAGE. From DNA sequence data, the estimated sizes of the E7 immunity protein and the E7 lysis protein were 9926 Da and 4847 Da, respectively. Comparison of restriction maps and DNA sequence data suggests that ColE7 and ColE2 are more closely related than other E colicin plasmids.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Bacterial Proteins / biosynthesis
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Bacterial Proteins / chemistry
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Bacterial Proteins / genetics
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Bacteriocin Plasmids / genetics*
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Base Sequence
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Cloning, Molecular
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Colicins*
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DNA, Bacterial / chemistry*
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Escherichia coli / genetics
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Escherichia coli Proteins*
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Molecular Sequence Data
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Operon
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Promoter Regions, Genetic
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Restriction Mapping
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Sequence Homology, Nucleic Acid
Substances
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Bacterial Proteins
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Colicins
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DNA, Bacterial
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Escherichia coli Proteins
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colicin immunity proteins
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immE9 protein, E coli
Associated data
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GENBANK/M57540
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GENBANK/M59337
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GENBANK/M59338
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GENBANK/M59339
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GENBANK/M59340
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GENBANK/M59341
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GENBANK/M59342
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GENBANK/M59343
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GENBANK/M59344
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GENBANK/M63943