De novo formation of focal complex-like structures in host cells by invading streptococci

Vered Ozeri, Ilan Rosenshine, Avri Ben-Ze'Ev, Gary M. Bokoch, Tzuu Shu Jou, Emanuel Hanski*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Group A streptococcus (GAS) induces its own entry into eukaryotic cells in vitro and in vivo. Fibronectin (Fn) bound to protein F1, a GAS surface protein, acts as a bridge connecting the bacterium to host cell integrins. This triggers clustering of integrins, which acquire a polar pattern of distribution similar to that of protein F1 on the GAS surface. A unique and transient adhesion complex is formed at the site of GAS entry, which does not contain α-actinin. Vinculin is recruited to the site of GAS entry but is not required for uptake. The invading GAS recruits focal adhesion kinase (FAK), which is required for uptake and is tyrosine phosphorylated. The Src kinases, Src, Yes and Fyn, enhance the efficiency of GAS uptake but are not absolutely required for GAS entry. In addition, Rac and Cdc42, but not Rho, are required for the entry process. We suggest a model in which integrin engagement by Fn-occupied protein F1 triggers two independent signalling pathways. One is initiated by FAK recruitment and tyrosine phosphorylation, whereas the other is initiated by the recruitment and activation of Rac. The two pathways subsequently converge to trigger actin rearrangement leading to bacterial uptake.

Original languageAmerican English
Pages (from-to)561-573
Number of pages13
JournalMolecular Microbiology
Volume41
Issue number3
DOIs
StatePublished - 2001

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