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Protein & Peptide Letters

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Letter Article

Comparative Proteomics of Commensal and Pathogenic Strains of Escherichia coli

Author(s): Neelja Singhal*, Divakar Sharma, Manish Kumar, Deepa Bisht and Jugsharan Singh Virdi*

Volume 27, Issue 11, 2020

Page: [1171 - 1177] Pages: 7

DOI: 10.2174/0929866527666200517104154

Price: $65

Abstract

Background: Most of the proteomic studies in Escherichia coli have focussed on pathogenic strains, while very few studies have studied the commensal strains. It is important to study the commensal strains because under the selective pressure of their habitat, commensal strains might serve as reservoirs of virulent and pathogenic strains.

Objective: In this study, we have performed a comparative proteomic analysis of commensal and pathogenic strains of E. coli isolated from a major river flowing through northern India.

Methods: Proteins were resolved by two dimensional gel electrophoresis and the differentially expressed proteins were identified using matrix-assisted laser desorption ionization-time of flight mass-spectrometry (MALDI-TOF MS).

Results: Many proteins of the commensal strain showed an increased expression compared to the pathogenic strain, of which seventeen proteins were identified by MALDI-TOF MS. Functional classification of these proteins revealed that they belonged to different functional pathways like energy metabolism, nucleotide and nucleoside conversions, translation, biosynthesis of amino acids and motility and energytaxis/chemotaxis.

Conclusion: As per the best of our knowledge, this is the first report on comparative proteomic analysis of E. coli commensal and pathogenic strains of aquatic origin. Our results suggest that the increased production of these proteins might play an important role in adaptation of E. coli to a commensal/pathogenic lifestyle. However, further experiments are required to understand the precise role of these proteins in regulating the pathogenicity/commensalism of E. coli.

Keywords: Escherichia coli, commensal, pathogenic, proteomics, two dimensional gel electrophoresis, adaptation.

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