New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.

Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain χ7122 (O78∶K80∶H9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-...

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Autores principales: Melha Mellata, Jacob T Maddux, Timothy Nam, Nicholas Thomson, Heidi Hauser, Mark P Stevens, Suman Mukhopadhyay, Shameema Sarker, Aurélie Crabbé, Cheryl A Nickerson, Javier Santander, Roy Curtiss
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Publicado: Public Library of Science (PLoS) 2012
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spelling oai:doaj.org-article:85ca0a5eeb33458ab5e993ecc1b9c1702021-11-18T07:30:58ZNew insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.1932-620310.1371/journal.pone.0029481https://doaj.org/article/85ca0a5eeb33458ab5e993ecc1b9c1702012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22238616/?tool=EBIhttps://doaj.org/toc/1932-6203Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain χ7122 (O78∶K80∶H9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-2 (IncFII), and pChi7122-3 (IncI(2))]; and a small plasmid pChi7122-4 (ColE2-like), has been used for many years as a model strain to study the molecular mechanisms of ExPEC pathogenicity and zoonotic potential. We previously sequenced and characterized the plasmid pChi7122-1 and determined its importance in systemic APEC infection; however the roles of the other pChi7122 plasmids were still ambiguous. Herein we present the sequence of the remaining pChi7122 plasmids, confirming that pChi7122-2 and pChi7122-3 encode an ABC iron transport system (eitABCD) and a putative type IV fimbriae respectively, whereas pChi7122-4 is a cryptic plasmid. New features were also identified, including a gene cluster on pChi7122-2 that is not present in other E. coli strains but is found in Salmonella serovars and is predicted to encode the sugars catabolic pathways. In vitro evaluation of the APEC χ7122 derivative strains with the three large plasmids, either individually or in combinations, provided new insights into the role of plasmids in biofilm formation, bile and acid tolerance, and the interaction of E. coli strains with 3-D cultures of intestinal epithelial cells. In this study, we show that the nature and combinations of plasmids, as well as the background of the host strains, have an effect on these phenomena. Our data reveal new insights into the role of extra-chromosomal sequences in fitness and diversity of ExPEC in their phenotypes.Melha MellataJacob T MadduxTimothy NamNicholas ThomsonHeidi HauserMark P StevensSuman MukhopadhyayShameema SarkerAurélie CrabbéCheryl A NickersonJavier SantanderRoy CurtissPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 1, p e29481 (2012)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Melha Mellata
Jacob T Maddux
Timothy Nam
Nicholas Thomson
Heidi Hauser
Mark P Stevens
Suman Mukhopadhyay
Shameema Sarker
Aurélie Crabbé
Cheryl A Nickerson
Javier Santander
Roy Curtiss
New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
description Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain χ7122 (O78∶K80∶H9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-2 (IncFII), and pChi7122-3 (IncI(2))]; and a small plasmid pChi7122-4 (ColE2-like), has been used for many years as a model strain to study the molecular mechanisms of ExPEC pathogenicity and zoonotic potential. We previously sequenced and characterized the plasmid pChi7122-1 and determined its importance in systemic APEC infection; however the roles of the other pChi7122 plasmids were still ambiguous. Herein we present the sequence of the remaining pChi7122 plasmids, confirming that pChi7122-2 and pChi7122-3 encode an ABC iron transport system (eitABCD) and a putative type IV fimbriae respectively, whereas pChi7122-4 is a cryptic plasmid. New features were also identified, including a gene cluster on pChi7122-2 that is not present in other E. coli strains but is found in Salmonella serovars and is predicted to encode the sugars catabolic pathways. In vitro evaluation of the APEC χ7122 derivative strains with the three large plasmids, either individually or in combinations, provided new insights into the role of plasmids in biofilm formation, bile and acid tolerance, and the interaction of E. coli strains with 3-D cultures of intestinal epithelial cells. In this study, we show that the nature and combinations of plasmids, as well as the background of the host strains, have an effect on these phenomena. Our data reveal new insights into the role of extra-chromosomal sequences in fitness and diversity of ExPEC in their phenotypes.
format article
author Melha Mellata
Jacob T Maddux
Timothy Nam
Nicholas Thomson
Heidi Hauser
Mark P Stevens
Suman Mukhopadhyay
Shameema Sarker
Aurélie Crabbé
Cheryl A Nickerson
Javier Santander
Roy Curtiss
author_facet Melha Mellata
Jacob T Maddux
Timothy Nam
Nicholas Thomson
Heidi Hauser
Mark P Stevens
Suman Mukhopadhyay
Shameema Sarker
Aurélie Crabbé
Cheryl A Nickerson
Javier Santander
Roy Curtiss
author_sort Melha Mellata
title New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
title_short New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
title_full New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
title_fullStr New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
title_full_unstemmed New insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic E. coli.
title_sort new insights into the bacterial fitness-associated mechanisms revealed by the characterization of large plasmids of an avian pathogenic e. coli.
publisher Public Library of Science (PLoS)
publishDate 2012
url https://doaj.org/article/85ca0a5eeb33458ab5e993ecc1b9c170
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