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Related Experiment Videos

Colicin E8, a DNase which indicates an evolutionary relationship between colicins E2 and E3.

M Toba1, H Masaki, T Ohta

  • 1Department of Agricultural Chemistry, University of Tokyo, Japan.

Journal of Bacteriology
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Colicin E8-J

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Colicins are bacteriocins produced by Escherichia coli.
  • Colicin E8-J is a complex of proteins A and B, with protein A exhibiting DNase activity inhibited by protein B.
  • This activity is similar to colicin E2.

Purpose of the Study:

  • To characterize the activities and gene structures of Colicin E8-J and its immunity protein.
  • To elucidate the evolutionary relationships of Colicin E8-J within the E-group of Col plasmids.

Main Methods:

  • DNA sequencing of the downstream half of the Colicin E8-J colicin operon.
  • Sequence homology analysis comparing Colicin E8-J with other E-group colicins (ColE2-P9 and ColE3-CA38).

Main Results:

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  • The nucleotide sequence of Colicin E8-J showed high homology to Colicin E2-P9, with variations in the 3'-terminal segment of the colicin and immunity genes.
  • The immE8 gene of Colicin E8-J was extensively homologous to the immE2-like gene of Colicin E3-CA38.
  • These findings suggest Colicin E8-J is evolutionarily situated between ColE2-P9 and ColE3-CA38.

Conclusions:

  • Colicin E8-J shares functional and structural similarities with other E-group colicins.
  • Sequence analysis provides insights into the evolution of E-group Col plasmids.
  • The study clarifies the evolutionary position of Colicin E8-J among related bacteriocins.