The Superior Adherence Phenotype of E. coli O104:H4 is Directly Mediated by the Aggregative Adherence Fimbriae Type I
Autor: | Ulrich Dobrindt, Michael Knödler, Petya Berger, Alexander Mellmann, Lilo Greune, Petra Dersch, Michael Berger, Angelika Fruth, Philipp Schiller |
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Rok vydání: | 2021 |
Předmět: |
Microbiology (medical)
Immunology Fimbria Infectious and parasitic diseases RC109-216 Enterohemorrhagic e coli Biology Serogroup medicine.disease_cause Microbiology Bacterial Adhesion biofilm 03 medical and health sciences enterohemorrhagic E. coli autoaggregation medicine polycyclic compounds Humans AAF adherence Escherichia coli Escherichia coli Infections 030304 developmental biology 0303 health sciences Virulence Strain (chemistry) 030306 microbiology Biofilm biochemical phenomena metabolism and nutrition bacterial infections and mycoses Phenotype Escherichia coli O104 Enteroaggregative E. coli Infectious Diseases Biofilms Fimbriae Bacterial Multigene Family bacteria Parasitology Research Article Research Paper |
Zdroj: | Virulence article-version (VoR) Version of Record Virulence, Vol 12, Iss 1, Pp 346-359 (2021) |
DOI: | 10.6084/m9.figshare.13490870 |
Popis: | Whereas the O104:H4 enterohemorrhagic Escherichia coli (EHEC) outbreak strain from 2011 expresses aggregative adherence fimbriae of subtype I (AAF/I), its close relative, the O104:H4 enteroaggregative Escherichia coli (EAEC) strain 55989, encodes AAF of subtype III. Tight adherence mediated by AAF/I in combination with Shiga toxin 2 production has been suggested to result in the outbreak strain’s exceptional pathogenicity. Furthermore, the O104:H4 outbreak strain adheres significantly better to cultured epithelial cells than archetypal EAEC strains expressing different AAF subtypes. To test whether AAF/I expression is associated with the different virulence phenotypes of the outbreak strain, we heterologously expressed AAF subtypes I, III, IV, and V in an AAF-negative EAEC 55989 mutant and compared AAF-mediated phenotypes, incl. autoaggregation, biofilm formation, as well as bacterial adherence to HEp-2 cells. We observed that the expression of all four AAF subtypes promoted bacterial autoaggregation, though with different kinetics. Disturbance of AAF interaction on the bacterial surface via addition of α-AAF antibodies impeded autoaggregation. Biofilm formation was enhanced upon heterologous expression of AAF variants and inversely correlated with the autoaggregation phenotype. Co-cultivation of bacteria expressing different AAF subtypes resulted in mixed bacterial aggregates. Interestingly, bacteria expressing AAF/I formed the largest bacterial clusters on HEp-2 cells, indicating a stronger host cell adherence similar to the EHEC O104:H4 outbreak strain. Our findings show that, compared to the closely related O104:H4 EAEC strain 55989, not only the acquisition of the Shiga toxin phage, but also the acquisition of the AAF/I subtype might have contributed to the increased EHEC O104:H4 pathogenicity. |
Databáze: | OpenAIRE |
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