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. 1988 Sep;170(9):4231–4238. doi: 10.1128/jb.170.9.4231-4238.1988

A hybrid toxin from bacteriophage f1 attachment protein and colicin E3 has altered cell receptor specificity.

K S Jakes 1, N G Davis 1, N D Zinder 1
PMCID: PMC211432  PMID: 3045089

Abstract

A hybrid protein was constructed in vitro which consists of the first 372 amino acids of the attachment (gene III) protein of filamentous bacteriophage f1 fused, in frame, to the carboxy-terminal catalytic domain of colicin E3. The hybrid toxin killed cells that had the F-pilus receptor for phage f1 but not F- cells. The activity of the hybrid protein was not dependent upon the presence of the colicin E3 receptor, BtuB protein. The killing activity was colicin E3 specific, since F+ cells expressing the colicin E3 immunity gene were not killed. Entry of the hybrid toxin was also shown to depend on the products of tolA, tolQ, and tolR which are required both for phage f1 infection and for entry of E colicins. TolB protein, which is required for killing by colicin E3, but not for infection by phage f1, was also found to be necessary for the killing activity of the hybrid toxin. The gene III protein-colicin E3 hybrid was released from producing cells into the culture medium, although the colicin E3 lysis protein was not present in those cells. The secretion was shown to depend on the 18-amino-acid-long gene III protein signal sequence. Deletion of amino acids 3 to 18 of the gene III moiety of the hybrid protein resulted in active toxin, which remained inside producing cells unless it was mechanically released.

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Selected References

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