Intimin from Shiga toxin-producing Escherichia coli and its isolated C-terminal domain exhibit different binding properties for Tir and a eukaryotic surface receptor.
The outer membrane protein intimin plays a crucial role in the attaching and effacing process employed by different enteropathogens to colonize the epithelial surface of their hosts. In this study we have characterized the C-terminal binding domain of intimin from the Shiga toxin-producing Escherichia coli strain 413/89-1, that belongs to the beta-subtype of intimins. We found that a fusion of this domain to the maltose-binding protein binds efficiently to both the translocated intimin receptor (Tir) and the surface of uninfected eukaryotic host cells. In contrast, no such binding was observed with the full-length protein localized on the bacterial surface. As the C-terminal domain of intimin and the full-length protein differ in their binding activity, we suggest that the intimin-binding domain might be controlled by the N-terminal portion of the molecule to prevent unproductive interactions with molecules in the lumen of the gut.
Deibel
C
C
Institut für Medizinische Mikrobiologie, Justus-Liebig-Universität, Giessen, Germany.
Dersch
P
P
Ebel
F
F
D018528:ATP-Binding Cassette Transporters; D018829:Adhesins, Bacterial; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism*; D004927:Escherichia coli Infections / Q000382:microbiology*; D029968:Escherichia coli Proteins; D017353:Gene Deletion; D006367:HeLa Cells; D006801:Humans; D058619:Maltose-Binding Proteins; D009004:Monosaccharide Transport Proteins; D011956:Receptors, Cell Surface / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D022621:Shiga Toxin / Q000378:metabolism
D018528:ATP-Binding Cassette Transporters; D018829:Adhesins, Bacterial; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D058619:Maltose-Binding Proteins; D009004:Monosaccharide Transport Proteins; D011956:Receptors, Cell Surface; D011993:Recombinant Fusion Proteins; C109287:Tir protein, E coli; C461599:maltose transport system, E coli; C073819:eaeA protein, E coli; D022621:Shiga Toxin