Enteropathogenic E. coli Tir binds Nck to initiate actin pedestal formation in host cells

Samantha Gruenheid, Rebekah DeVinney, Friedhelm Bladt, Danika Goosney, Sigal Gelkop, Gerald D. Gish, Tony Pawson, B. Brett Finlay

Research output: Contribution to journalArticlepeer-review

302 Scopus citations

Abstract

Enteropathogenic Escherichia coli (EPEC) is a bacterial pathogen that causes infantile diarrhea worldwide1. EPEC injects a bacterial protein, translocated intimin receptor (Tir), into the host-cell plasma membrane where it acts as a receptor for the bacterial outer membrane protein, intimin2. The interaction of Tir and intimin triggers a marked rearrangement of the host actin cytoskeleton into pedestals beneath adherent bacteria. On delivery into host cells, EPEC Tir is phosphorylated on tyrosine 474 of the intracellular carboxy-terminal domain, an event that is required for pedestal formation3. Despite its essential role, the function of Tir tyrosine phosphorylation has not yet been elucidated. Here we show that tyrosine 474 of Tir directly binds the host-cell adaptor protein Nck, and that Nck is required for the recruitment of both neural Wiskott-Aldrich-syndrome protein (N-WASP) and the actin-related protein (Arp)2/3 complex to the EPEC pedestal, directly linking Tir to the cytoskeleton. Cells with null alleles of both mammalian Nck genes are resistant to the effects of EPEC on the actin cytoskeleton. These results implicate Nck adaptors as host-cell determinants of EPEC virulence.

Original languageEnglish
Pages (from-to)856-859
Number of pages4
JournalNature Cell Biology
Volume3
Issue number9
DOIs
StatePublished - 26 Sep 2001
Externally publishedYes

ASJC Scopus subject areas

  • Cell Biology

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