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PMID: 12011002 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Quorum-sensing Escherichia coli regulator A: a regulator of the LysR family involved in the regulation of the locus of enterocyte effacement pathogenicity island in enterohemorrhagic E. coli.

Infection and immunity ·Vol. 70 ·No. 6 ·2002-06-00 ·Pages 3085-93

Sperandio V, Li CC, Kaper JB

Abstract

The locus of enterocyte effacement (LEE) is a chromosomal pathogenicity island that encodes the proteins involved in the formation of the attaching and effacing lesions by enterohemorrhagic Escherichia coli (EHEC) and enteropathogenic E. coli (EPEC). The LEE comprises 41 open reading frames organized in five major operons, LEE1, LEE2, LEE3, tir (LEE5), and LEE4, which encode a type III secretion system, the intimin adhesin, the translocated intimin receptor (Tir), and other effector proteins. The first gene of LEE1 encodes the Ler regulator, which activates all the other genes within the LEE. We previously reported that the LEE genes were activated by quorum sensing through Ler (V. Sperandio, J. L. Mellies, W. Nguyen, S. Shin, and J. B. Kaper, Proc. Natl. Acad. Sci. USA 96:15196-15201, 1999). In this study we report that a putative regulator in the E. coli genome is itself activated by quorum sensing. This regulator is encoded by open reading frame b3243; belongs to the LysR family of regulators; is present in EHEC, EPEC, and E. coli K-12; and shares homology with the AphB and PtxR regulators of Vibrio cholerae and Pseudomonas aeruginosa, respectively. We confirmed the activation of b3243 by quorum sensing by using transcriptional fusions and renamed this regulator quorum-sensing E. coli regulator A (QseA). We observed that QseA activated transcription of ler and therefore of the other LEE genes. An EHEC qseA mutant had a striking reduction of type III secretion activity, which was complemented when qseA was provided in trans. Similar results were also observed with a qseA mutant of EPEC. The QseA regulator is part of the regulatory cascade that regulates EHEC and EPEC virulence genes by quorum sensing.

MeSH Terms
Amino Acid Sequence Bacterial Proteins/classification,genetics,metabolism Escherichia coli O157/genetics Escherichia coli Proteins/genetics,metabolism Gene Expression Regulation, Bacterial Molecular Sequence Data Operon Phosphoproteins Promoter Regions, Genetic Sequence Homology, Amino Acid Trans-Activators/classification,genetics,metabolism Transcription Factors Transcriptional Activation
Chemicals
Bacterial Proteins Escherichia coli Proteins LEE protein, E coli Phosphoproteins QseA protein, E coli Trans-Activators Transcription Factors LysR protein, Bacteria
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Sperandio Vanessa
Center for Vaccine Development and Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA.
Li Caiyi C
Kaper James B
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Article Info
Journal
Infection and immunity
Abbr.
Infect Immun
ISSN
0019-9567
DOI
10.1128/IAI.70.6.3085-3093.2002
Published
2002-06-00
Pages
3085-93
Language
English
Region
United States
NLM ID
0246127
PMCID
PMC127966
Subset
IM
Grants
NIDDK NIH HHS · R01 DK058957 · United States
NIAID NIH HHS · R01 AI021657 · United States
NIAID NIH HHS · R37 AI021657 · United States
NIAID NIH HHS · AI41325 · United States
NIDDK NIH HHS · DK58957 · United States
NIAID NIH HHS · AI21657 · United States
External Links
PubMed source DOI: 10.1128/IAI.70.6.3085-3093.2002 PMC Full Text View journal details
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