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FEMS Microbiol Lett. 1990 Sep 1;59(1-2):149-55.

Photosensitizing activity of water- and lipid-soluble phthalocyanines on Escherichia coli.

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1
Institute of Microbiology, University of Padova, Italy.

Abstract

Escherichia coli, as most Gram-negative bacteria, is insensitive to the photosensitizing action of both lipid-soluble Zinc-phthalocyanine (Zn-Pc) and water-soluble Zinc-mono/disulfonated phthalocyanine (Zn-PcS). Photosensitivity can be induced by alteration of the outer membrane, as obtained by either induction of competence or treatment with Tris-EDTA. Both phthalocyanines largely bind at the level of the cytoplasmic membrane; however, Zn-PcS shows a superior photosensitizing activity as compared with Zn-Pc. Biochemical analyses performed on irradiated cells suggest that the cytoplasmic membrane is an important target of the photoprocess, while DNA is not involved.

[Indexed for MEDLINE]

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