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Functional domains of S-type pyocins deduced from chimeric molecules.

Mitsubishi Kasei Institute of Life Sciences, Tokyo, Japan.

ABSTRACT

Functional domain structures of pyocins AP41, S1, and S2 were assigned by examining the functions of chimeric pyocins and deletion derivatives. Pyocins AP41, S1, and S2 are essentially composed of three domains, the receptor-binding domain, the translocation domain, and the DNase domain, in that order from the N terminus to the C terminus. The alignment of these domains is distinct from that in E2-group colicins with functions similar to those of these pyocins. Pyocins AP41 and S2 have a fourth domain between the receptor-binding and the translocation domains, which is dispensable for their killing functions.

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