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Journal of Bacteriology, August 2004, p. 5432-5441, Vol. 186, No. 16
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.16.5432-5441.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Analysis of the Genome Structure of the Nonpathogenic Probiotic Escherichia coli Strain Nissle 1917

Lubomir Grozdanov,1 Carsten Raasch,2 Jürgen Schulze,3 Ulrich Sonnenborn,4 Gerhard Gottschalk,2 Jörg Hacker,1 and Ulrich Dobrindt1*

Institut für Molekulare Infektionsbiologie, Universität Würzburg, 97070 Würzburg,1 Institut für Mikrobiologie und Genetik and Göttingen Genomics Laboratory, Universität Göttingen, 37077 Göttingen,2 Bereich Medizin,3 Abteilung Biologische Forschung, Ardeypharm GmbH, 58313 Herdecke, Germany4

Received 13 February 2004/ Accepted 17 May 2004

Nonpathogenic Escherichia coli strain Nissle 1917 (O6:K5:H1) is used as a probiotic agent in medicine, mainly for the treatment of various gastroenterological diseases. To gain insight on the genetic level into its properties of colonization and commensalism, this strain's genome structure has been analyzed by three approaches: (i) sequence context screening of tRNA genes as a potential indication of chromosomal integration of horizontally acquired DNA, (ii) sequence analysis of 280 kb of genomic islands (GEIs) coding for important fitness factors, and (iii) comparison of Nissle 1917 genome content with that of other E. coli strains by DNA-DNA hybridization. PCR-based screening of 324 nonpathogenic and pathogenic E. coli isolates of different origins revealed that some chromosomal regions are frequently detectable in nonpathogenic E. coli and also among extraintestinal and intestinal pathogenic strains. Many known fitness factor determinants of strain Nissle 1917 are localized on four GEIs which have been partially sequenced and analyzed. Comparison of these data with the available knowledge of the genome structure of E. coli K-12 strain MG1655 and of uropathogenic E. coli O6 strains CFT073 and 536 revealed structural similarities on the genomic level, especially between the E. coli O6 strains. The lack of defined virulence factors (i.e., alpha-hemolysin, P-fimbrial adhesins, and the semirough lipopolysaccharide phenotype) combined with the expression of fitness factors such as microcins, different iron uptake systems, adhesins, and proteases, which may support its survival and successful colonization of the human gut, most likely contributes to the probiotic character of E. coli strain Nissle 1917.

* Corresponding author. Mailing address: Institut für Molekulare Infektionsbiologie, Röntgenring 11, D-97070 Würzburg, Germany. Phone: 49 (0)931 312155. Fax: 49 (0)931 312578. E-mail: ulrich.dobrindt{at}mail.uni-wuerzburg.de.

Journal of Bacteriology, August 2004, p. 5432-5441, Vol. 186, No. 16
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.16.5432-5441.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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