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. 1975 Sep;8(3):356–365. doi: 10.1128/aac.8.3.356

Binding of Bacteriocin Clo DF13 to Clo DF13 Plasmid Deoxyribonucleic Acid In Vivo and In Vitro

E Veltkamp 1, R Blankevoort 1, H J J Nijkamp 1
PMCID: PMC429318  PMID: 1101824

Abstract

The bacteriocinogenic plasmid Clo DF13 is present in Escherichia coli to the extent of 10 copies per cell. A complex of Clo DF13 plasmid deoxyribonucleic acid (DNA) and protein can be isolated from cells. Treatment of the complex with ionic detergents or proteases dissociates the complex but does not convert any supercoiled Clo DF13 DNA to the open circular form, indicating that this complex is not a relaxation complex. The complex is stable in 0.5 M NaCl and contains one polypeptide species. The protein, present in the complex, appeared to be bacteriocin Clo DF13 for the following reasons: (i) the protein is de novo synthesized in Clo DF13-harboring minicells, indicating that this protein is Clo DF13 specific; (ii) this protein shows bacteriocinogenic activity on a bacteriocin Clo DF13-susceptible indicator strain; (iii) this protein has the same molecular weight (60,000) as bacteriocin Clo DF13. DNA-protein binding experiments, involving QAE-Sephadex column chromatography and nitrocellulose membrane filters, demonstrate that bacteriocin Clo DF13 has also affinity in vitro for Clo DF13 DNA. Membrane filter binding experiments revealed that bacteriocin Clo DF13 does not interact with other DNA species, such as ColE1 DNA, yeast DNA, calf thymus DNA, φX174 DNA, and also not with denatured Clo DF13 DNA. In addition no binding to Clo DF13 DNA of a related bacteriocin, colicin E3, could be detected. These results indicate that the binding of bacteriocin Clo DF 13 to double-stranded Clo DF13 DNA is very specific.

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Selected References

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