Cloning and expression of the Pseudomonas aeruginosa exoenzyme S toxin gene

Microbial Pathogenesis
P A SokolD Woods

Abstract

The gene for exoenzyme S, an ADP-ribosyl transferase, was cloned from Pseudomonas aeruginosa strain DG1 using an oligonucleotide probe based on the partial N-terminal amino acid sequence to screen a library of DG1 SstI fragments inserted into pKT230 in Escherichia coli DH1. A positive clone, designated pPD3, hybridized with the oligonucleotide probe and contained a 15 kb SstI insert. In E. coli minicells pPD3 expressed a single protein of Mr 68,000. This protein was localized primarily in the periplasm in E. coli. A 3.6 kb HindIII-BamHI fragment was subcloned into the vector pT7-4 which contains the promoter from bacteriophage T7 to construct pT7-4HB. In E. coli strains expressing the T7 RNA polymerase on a second plasmid, the Mr 68,000 protein was expressed and shown to react with antibodies to exoenzyme S. No enzymatic activity was detected in cell sonicates or culture supernatants of E. coli (pPD3). Cell sonicates of E. coli (pT7-4HB) however were cytotoxic to HeLa cells and this cytotoxicity was neutralizable with anti-exoenzyme S antiserm. Thus, exoenzyme S expressed in E. coli is toxic but not enzymatically active. When plasmids carrying the exoenzyme S gene were introduced into P. aeruginosa, there was a significant incr...Continue Reading

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Citations

Jan 15, 1996·FEMS Microbiology Letters·J Goranson, D W Frank
Sep 1, 1992·FEMS Microbiology Reviews·J TommassenA Lazdunski
Feb 6, 1998·FEMS Microbiology Reviews·E S Stanislavsky, J S Lam
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Jan 1, 1995·Infection and Immunity·S M KulichJ T Barbieri

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