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Human infections with enterohemorrhagic E. coli (EHEC) strains of serotype O103:H2 are of increasing importance in Germany. As bovines are the principal EHEC reservoir behind the occurrence of human infections, we analyzed a pathogenicity island (PAI I(RW1374)) of bovine O103:H2 strain RW1374 to identify putative virulence features. This PAI I(RW1374) harbors a functional 34-kb locus of enterocyte effacement (LEE) core region and has a total length of 111 kb. About 43 kb upstream of the LEE core a gene cassette consisting of efa1/lifA gene and flanking IS elements suggests another putative transposon within the PAI(IRW1374). In addition, the ent gene, encoding a Shigella ShET-2 enterotoxin homologue, is present about 57 kb upstream of the LEE core. This PAI is therefore a complex assembly of various virulence determinants including the efa1/lifA and the ent gene resembling O157:H7 PAI OI-122/SpLE3 as well as the LEE core region. An integrase gene on the very left end of PAI I(Rw1374) is disrupted by an IS629 homologue. In an attempt to mobilize the LEE core we performed conjugation, transformation and transduction experiments. We were, however, unable to mobilize the whole or even single regions of PAI I(RW1374). Comparative studies with other strains of serotype O103:H2 isolated from humans, bovines and food showed that they all harbored a similar phe V-inserted PAI including the virulence genes ent and lifA/efa1 as well as the large virulence-associated plasmid encoding the EHEC hemolysin. This combination of several virulence factors confirms the complex virulence of O103:H2 EHEC and may at least partly explain the high virulence of this EHEC serotype in humans.
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http://dx.doi.org/10.1016/j.ijmm.2004.09.009 | DOI Listing |
Nat Mater
January 2018
480 Biomedical, Inc., Watertown, Massachusetts 02472, USA.
Implants for the treatment of tissue defects should mimic the mechanical properties of the native tissue of interest and should be resorbable as well as biocompatible. In this work, we developed a scaffold from variants of poly(glycolic) acid which were braided and coated with an elastomer of poly(glycolide-co-caprolactone) and crosslinked. The coating of the scaffold with the elastomer led to higher mechanical strength in terms of compression, expansion and elasticity compared to braids without the elastomer coating.
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