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Role of Klebsiella pneumoniae Type VI secretion system (T6SS) in long-term gastrointestinal colonization. | LitMetric
Type VI secretion systems (T6SS), recently described in hypervirulent K. pneumoniae (hvKp) strains, are involved in bacterial warfare but their role in classical clinical strains (cKp) has been little investigated. In silico analysis indicated the presence of T6SS clusters (from zero to four), irrespective of the strains origin or virulence, with a high prevalence in the K. pneumoniae species (98%). In the strain CH1157, two T6SS-apparented pathogenicity islands were detected, T6SS-1 and -2, harboring a phospholipase-encoding gene (tle1) and a potential new effector-encoding gene named tke (Type VI Klebsiella effector). Tle1 expression in Escherichia coli periplasm affected cell membrane permeability. T6SS-1 isogenic mutants colonized the highest gastrointestinal tract of mice less efficiently than their parental strain, at long term. Comparative analysis of faecal 16S sequences indicated that T6SS-1 impaired the microbiota richness and its resilience capacity. Oscillospiraceae family members could be specific competitors for the long-term gut establishment of K. pneumoniae.
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