DOI: 10.1046/j.1365-2958.2002.03214.x. The N‐terminus of enteropathogenic <i>Escherichia coli</i> (EPEC) Tir mediates transport across bacterial and eukaryotic cell membranes

The N‐terminus of enteropathogenic Escherichia coli (EPEC) Tir mediates transport across bacterial and eukaryotic cell membranes

10.1046/j.1365-2958.2002.03214.x

Crossref journal-article

Wiley

Molecular Microbiology (311)

Abstract

SummaryEnteropathogenic Escherichia coli (EPEC) uses a type III secretion system to translocate into host cells several effector molecules that are required for virulence. One of these, the translocated intimin receptor, Tir, inserts into the host cell cytoplasmic membrane, where it functions as the receptor for intimin, an outer membrane adhesin expressed by EPEC. A chaperone for Tir, called CesT, is required for stability of Tir in the EPEC cytoplasm. In this study, the cyaA gene reporter system was used to identify domains in Tir that mediate secretion into the culture supernatant and translocation into host cells. A Tir–CyaA fusion containing the first 15 N‐terminal residues of Tir was secreted and translocated into HeLa cells by a ΔtirΔcesT mutant; however, maximal secretion and translocation was observed with the first 26 N‐terminal residues of Tir. Fusions containing progressively larger N‐terminal sequences of Tir were also efficiently secreted and translocated into HeLa cells by the ΔtirΔcesT strain. However, in a Δtir mutant that expresses CesT, Tir26–CyaA and an additional fusion containing the first 69 N‐terminal residues of Tir were not secreted or translocated, but fusions containing larger N‐terminal Tir sequences were secreted and translocated by the Δtir mutant. Wild‐type EPEC secreted and translocated the Tir15–CyaA fusion, whereas longer fusions, such as Tir26–CyaA and Tir69–CyaA, were translocated to higher levels, similar to what was observed with the ΔtirΔcesT mutant. A Tir–CyaA fusion containing the CesT binding domain was translocated into HeLa cells more rapidly in the presence of CesT compared with translocation in the absence of CesT. Collectively, these results suggest that an N‐terminal domain of 26 amino acids functions as a CesT‐independent signal that is capable of delivering Tir into both the culture supernatant and the cytosol of host cells. Furthermore, in addition to its role in the stability of Tir, CesT may function in translocation by mediating rapid delivery of Tir into host cells.

Bibliography

Crawford, J. A., & Kaper, J. B. (2002). The Nâterminus of enteropathogenic Escherichia coli (EPEC) Tir mediates transport across bacterial and eukaryotic cell membranes. Molecular Microbiology, 46(3), 855â868. Portico.

Authors 2

J. Adam Crawford (first)
James B. Kaper (additional)

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Dates

Type	When
Created	22 years, 5 months ago (March 12, 2003, 6:46 a.m.)
Deposited	1 year, 10 months ago (Oct. 17, 2023, 9:15 a.m.)
Indexed	4 months, 2 weeks ago (April 22, 2025, 3:12 a.m.)
Issued	22 years, 10 months ago (Oct. 31, 2002)
Published	22 years, 10 months ago (Oct. 31, 2002)
Published Online	22 years, 10 months ago (Oct. 31, 2002)
Published Print	22 years, 10 months ago (Nov. 1, 2002)

Funders 0

None

BibTeX

@article{Crawford_2002, title={The N‐terminus of enteropathogenic Escherichia coli (EPEC) Tir mediates transport across bacterial and eukaryotic cell membranes}, volume={46}, ISSN={1365-2958}, url={http://dx.doi.org/10.1046/j.1365-2958.2002.03214.x}, DOI={10.1046/j.1365-2958.2002.03214.x}, number={3}, journal={Molecular Microbiology}, publisher={Wiley}, author={Crawford, J. Adam and Kaper, James B.}, year={2002}, month=oct, pages={855–868} }

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