1. Recruitment and membrane interactions of host cell proteins during attachment of enteropathogenic and enterohemorrhagic Escherichia coli
- Author
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Jesus Ayala-Sanmartin, Diana Munera, Svetlana Varyukhina, Gad Frankel, Eric Martinez, Arvind Mahajan, Université Pierre et Marie Curie - Paris 6 (UPMC), Centre d’études d’Agents Pathogènes et Biotechologies pour la Santé (CPBS), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Medical Research Council Centre for Molecular Bacteriology and Infection [Londres, Royaume-Uni] (MRC CMBI), and Imperial College London
- Subjects
Diarrhea ,Sodium-Hydrogen Exchangers ,Receptors, Cell Surface ,Biology ,Biochemistry ,Models, Biological ,digestive system ,Article ,Bacterial Adhesion ,Microbiology ,law.invention ,Type three secretion system ,03 medical and health sciences ,Enteropathogenic Escherichia coli ,law ,parasitic diseases ,Humans ,Protein Interaction Domains and Motifs ,Molecular Biology ,Actin ,Ion channel ,Annexin A2 ,Escherichia coli Infections ,ComputingMilieux_MISCELLANEOUS ,030304 developmental biology ,DNA Primers ,0303 health sciences ,Base Sequence ,Effector ,[CHIM.ORGA]Chemical Sciences/Organic chemistry ,Escherichia coli Proteins ,030302 biochemistry & molecular biology ,Cell Biology ,biochemical phenomena, metabolism, and nutrition ,Phosphoproteins ,[SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology ,Recombinant Proteins ,Cell culture ,Enterohemorrhagic Escherichia coli ,Host-Pathogen Interactions ,Recombinant DNA ,bacteria ,HeLa Cells - Abstract
EPEC (enteropathogenic Escherichia coli) and EHEC (enterohaemorrhagic Escherichia coli) are attaching and effacing pathogens frequently associated with infectious diarrhoea. EPEC and EHEC use a T3SS (type III secretion system) to translocate effectors that subvert different cellular processes to sustain colonization and multiplication. The eukaryotic proteins NHERF2 (Na+/H+ exchanger regulatory factor 2) and AnxA2 (annexin A2), which are involved in regulation of intestinal ion channels, are recruited to the bacterial attachment sites. Using a stable HeLa-NHERF2 cell line, we found partial co-localization of AnxA2 and NHERF2; in EPEC-infected cells, AnxA2 and NHERF2 were extensively recruited to the site of bacterial attachment. We confirmed that NHERF2 dimerizes and found that NHERF2 interacts with AnxA2. Moreover, we found that AnxA2 also binds both the N- and C-terminal domains of the bacterial effector Tir through its C-terminal domain. Immunofluorescence of HeLa cells infected with EPEC showed that AnxA2 is recruited to the site of bacterial attachment in a Tir-dependent manner, but independently of Tir-induced actin polymerization. Our results suggest that AnxA2 and NHERF2 form a scaffold complex that links adjacent Tir molecules at the plasma membrane forming a lattice that could be involved in retention and dissemination of other effectors at the bacterial attachment site.
- Published
- 2012
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