Comparison of Colicins B-K260 and D-CA23: Purification and Characterization of the Colicins and Examination of Colicin Immunity in the Producing Strains | Zendy

Anthony P. Pugsley | Zendy; Peter R. Reeves | Zendy

Open Access

Comparison of Colicins B-K260 and D-CA23: Purification and Characterization of the Colicins and Examination of Colicin Immunity in the Producing Strains

Author(s) -

Anthony P. Pugsley,

Peter R. Reeves

Publication year - 1977

Publication title -

antimicrobial agents and chemotherapy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.07

H-Index - 259

eISSN - 1070-6283

pISSN - 0066-4804

DOI - 10.1128/aac.11.2.345

Subject(s) - colicin , isoelectric point , ammonium sulfate precipitation , escherichia coli , size exclusion chromatography , biology , isoelectric focusing , microbiology and biotechnology , antigen , ion chromatography , bacteriocin , ammonium , biochemistry , chemistry , chromatography , antimicrobial , genetics , enzyme , organic chemistry , gene

Colicins B-K260 and D-CA23 were purified by ammonium sulfate precipitation, gel filtration, and ion-exchange chromatography and were compared with respect to a number of physical and chemical properties. Both colicins were shown to be proteins and were found to have similar molecular weights, isoelectric points and amino acid compositions. The two colicins also have substantial antigenic similarities but are distinguished by the presence of non-cross-reacting antigens and by differences in stability and in sensitivity to heat and reducing conditions. In addition, strains of Escherichia coli K-12 producing colicins B-K260 and D-CA23 are not cross-immune. The similarities noted between the two colicins are compatible with their use of a common cell surface receptor while having different modes of action.

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