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© Research
Publication : The EMBO journal

IpaB of Shigella flexneri causes entry into epithelial cells and escape from the phagocytic vacuole

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 01 May 1992

High N, Mounier J, Prévost MC, Sansonetti PJ

Link to Pubmed [PMID] – 1582426

EMBO J. 1992 May;11(5):1991-9

By creating mutations within the Shigella flexneri ipaB gene, we have demonstrated that the invasion of epithelial cells is a three-step process encompassing adhesion on the cell surface, entry and lysis of the phagocytic vacuole allowing subsequent access to the cytoplasm. SC403, an insertion mutant which lacks expression of IpaB but still expresses downstream genes, has been particularly studied. It is non-invasive, does not elicit actin polymerization, but binds to HeLa cells indicating that an adhesion step occurs immediately prior to the entry process. The consequence of the inactivation of ipaB on the intracellular behaviour of S.flexneri was investigated using the macrophage cell line J774. SC403 was unable to lyse the phagocytic vacuole; moreover, this strain did not display the contact mediated haemolytic activity characteristics of Shigella. In addition to being a major component of the invasion complex, IpaB acts as a membrane-lysing toxin enabling escape to the cytoplasmic compartment.

http://www.ncbi.nlm.nih.gov/pubmed/1582426