Journal article
Type 2 Secretion Promotes Enterohemorrhagic Escherichia coli Adherence and Intestinal Colonization
Infection and immunity, Vol.76(5), pp.1858-1865
03/03/2008
DOI: 10.1128/IAI.01688-07
PMCID: PMC2346697
PMID: 18316380
Abstract
Enterohemorrhagic
Escherichia coli
(EHEC) is a noninvasive food-borne pathogen that colonizes the distal ileum and colon. Proteins encoded in the EHEC locus of enterocyte effacement (LEE) pathogenicity island are known to contribute to this pathogen's adherence to epithelial cells and intestinal colonization. The role of non-LEE-encoded proteins in these processes is not as clear. We found that the Z2053 gene (designated
adfO
here), a gene located in a cryptic EHEC prophage, exhibits similarity to adherence and/or colonization factor genes found in several other enteric pathogens. An EHEC
adfO
mutant exhibited marked reductions in adherence to HeLa cells and in the secretion of several proteins into the supernatant. YodA, one of these secreted proteins, was found to be a substrate of the EHEC pO157-encoded type 2 secretion system (T2SS). Both the T2SS and YodA proved to be essential for EHEC adherence to cultured HeLa cell monolayers. Using an infant rabbit model of infection, we found that the
adfO
mutation did not affect colonization but that the colonization of an
etpC
(T2SS) mutant was reduced ∼5-fold. A strain deficient in YodA had a more severe colonization defect; however, this strain also exhibited a growth defect in vitro. Overall, our findings indicate that the pO157-encoded T2SS contributes to EHEC adherence and intestinal colonization and thus show that EHEC pathogenicity depends on type 2 secretion as well as type 3 secretion.
Details
- Title: Subtitle
- Type 2 Secretion Promotes Enterohemorrhagic Escherichia coli Adherence and Intestinal Colonization
- Creators
- Theresa D. Ho - Brigham and Women's HospitalBrigid M. Davis - Brigham and Women's HospitalJennifer M. Ritchie - Brigham and Women's HospitalMatthew K. Waldor - Brigham and Women's Hospital
- Resource Type
- Journal article
- Publication Details
- Infection and immunity, Vol.76(5), pp.1858-1865
- Publisher
- American Society for Microbiology (ASM)
- DOI
- 10.1128/IAI.01688-07
- PMID
- 18316380
- PMCID
- PMC2346697
- ISSN
- 0019-9567
- eISSN
- 1098-5522
- Language
- English
- Date published
- 03/03/2008
- Academic Unit
- Microbiology and Immunology
- Record Identifier
- 9984297433902771
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