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ISSN: 0974-276X

Journal of Proteomics & Bioinformatics
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Research Article

Proteome Analysis of a Food Borne Pathogen Enteroaggregative Escherichia coli under Acid Stress

Punit Kaur§, and Anuradha Chakraborti*

Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India.

§Present address: Scott & White Memorial Hospital and Clinic and The Texas A&M Health Science Center College of Medicine, 1901 South 1st Street, Temple, TX 76504, USA.

*Corresponding Author:
Dr. Prof. Anuradha Chakraborti
Department of Experimental Medicine and Biotechnology
PGIMER, Chandigarh- 160012, India
Tel: +91-172-2755230
Fax: +91-172-2744401
E-mail: [email protected]

Received Date: November 10, 2009; Accepted Date: January 08, 2010; Published Date: January 08, 2010

Citation: Kaur P, Chakraborti A (2010) Proteome Analysis of a Food Borne Pathogen Enteroaggregative Escherichia coli under Acid Stress. J Proteomics Bioinform 3: 010-019. doi: 10.4172/jpb.1000116

Copyright: © 2010 Kaur P, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Enteroaggregative Escherichia coli (EAEC) is emerging as a significant diarrheal pathogen in multiple population groups. Like any other enteropathogen, EAEC may encounter life-threatening levels of inorganic acids (H+) during their natural route of infection. In this study, we showed that EAEC orchestrates acid tolerance by modulating the levels of acid-induced outer membrane proteins (OMP). EAEC (T8) was grown in vitro by mimicking in vivo pH conditions of both in stomach and intestine. The lowest pH where EAEC showed growth was 4.0 in Luria Bertani (LB) media, and surprisingly during log phase two de novo OMP of sizes 41 kDa and 48 kDa were exclusively observed at this pH. Further, acid-induced proteins at pH 4.0 were identified by 2D gel electrophoresis and Matrix Assisted Laser Desorption Ionization-Time of Flight (MALDI-TOF). The role of the most notable acid/pH response regulator rpoS in ASP expression was determined by gene knockout in the clinical strain EAEC (T8). Mutation of rpoS gene suppressed growth and downregulated the expression of ASP in EAEC (T8) at pH 4.0 confirming probable role of rpoS in EAEC.

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