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Infection and Immunity logoLink to Infection and Immunity
. 1990 Jun;58(6):1565–1571. doi: 10.1128/iai.58.6.1565-1571.1990

Construction and analysis of TnphoA mutants of enteropathogenic Escherichia coli unable to invade HEp-2 cells.

M S Donnenberg 1, S B Calderwood 1, A Donohue-Rolfe 1, G T Keusch 1, J B Kaper 1
PMCID: PMC258676  PMID: 2160428

Abstract

Enteropathogenic Escherichia coli (EPEC) strains have recently been shown to invade tissue culture cells. We describe a set of 22 Tn5 IS50L::phoA (TnphoA) insertion mutants of EPEC strain E2348-69 that are unable to invade HEp-2 cells. Each mutant was tested for the ability to adhere to and to induce the polymerization of actin in HEp-2 cells. Southern hybridization of plasmid and total DNA of each strain was performed to determine the location of each TnphoA insert, and each TnphoA insert along with flanking EPEC sequences was cloned. These studies resulted in the grouping of the mutants into five main categories. These include strains with plasmid and chromosomal insertions that alter adherence, chromosomal insertions that alter the ability to induce actin polymerization, and chromosomal insertions that do not affect adherence or actin polymerization. These studies indicate that genes affecting EPEC adherence may be located on both the plasmid and chromosome, that several genes are involved in the induction of actin polymerization in epithelial cells, and that EPEC invasion is a complex process involving multiple genetic loci.

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Selected References

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