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. 1987 Jun;169(6):2561–2569. doi: 10.1128/jb.169.6.2561-2569.1987

Molecular cloning of invasion plasmid antigen (ipa) genes from Shigella flexneri: analysis of ipa gene products and genetic mapping.

J M Buysse, C K Stover, E V Oaks, M Venkatesan, D J Kopecko
PMCID: PMC212123  PMID: 3294797

Abstract

Tn5-tagged invasion plasmid DNA (pWR110) from Shigella flexneri serotype 5 (strain M90T) was cloned into the expression vector lambda gt11. Recombinant phage (lambda gt11Sfl) expressing pWR110-encoded polypeptide antigens were identified by using rabbit antisera directed against S. flexneri M90T invasion plasmid antigens. Antigens encoded by lambda gt11Sfl recombinant phage were characterized by reacting affinity-purified antibodies, eluted from nitrocellulose-bound plaques of lambda gt11Sfl recombinants, with virulent, wild-type S. flexneri M90T polypeptides in Western blot analyses. lambda gt11Sfl clones directing the synthesis of complete, truncated, and beta-galactosidase fusion versions of three previously identified outer membrane polypeptides (57-, 43-, and 39-kilodalton [kDa] antigens) were isolated. A fourth polypeptide, similar in size to the 57-kDa antigen (ca. 58 kDa) but unrelated as determined by DNA homology and serological measurements, was also identified. Southern blot analysis of S. flexneri M90T invasion plasmid DNA hybridized with lambda gt11Sfl insert DNA probes was used to construct a map of invasion plasmid antigen genes (ipa) corresponding to the 57-kDa (ipaB), 43-kDa (ipaC), and 39-kDa (ipaD) polypeptides. Genes ipaB, ipaC and ipaD mapped to contiguous 4.6-kilobase (kb) and 1.0-kb HindIII fragments contained within a larger (23-kb) BamHI fragment. The ipaH gene, which encodes the synthesis of the 58-kDa polypeptide, did not map in or near the ipaBCD gene cluster, suggesting a distinct location of ipaH on the invasion plasmid.

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Selected References

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