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• W1998766891 abstract "Numerous chromosomal virulence genes (chv) have been shown to play an important role in the ability of Agrobacterium tumefaciens to transform plants. The A. tumefaciens chvH gene encodes a protein similar in sequence to the Escherichia coli elongation factor P (EF-P). In A. tumefaciens this factor is required for tumor formation and for full expression of the vir genes, exerting its activity at a post-transcriptional level. Cross-complementation assays suggest that the chvH gene and the efp gene of E. coli are functionally homologous. We have cloned and characterized the efp homolog gene in Brucella abortus which has 45% identity to A. tumefaciens chvH and 35% identity to E. coli efp. The gene complemented detergent sensitivity and virulence in the chvH A. tumefaciens mutant, suggesting that both genes are functionally homologous; the growth rate in complex medium also increased to wild type levels. An efp mutant in B. abortus 2308 grew slower in complex media and showed more sensitivity to detergents. Infection assays in J774 macrophage like cells revealed no significant differences between the wild type and the efp mutant strains. The recovery of this mutant from spleens of inoculated mice was equivalent compared to that of the parental strain suggesting that B. abortus efp is not required for virulence in an animal model. However the efp mutant revealed significant differences at 1 h-4 h post-infection in HeLa infection assays compared to the wild type strain, indicating that cellular internalization was affected in non-professional phagocytes. Double immunofluorescence assays for detecting extracellular and intracellular bacteria, demonstrated that the mutant attaches to HeLa cells as the wild type but is deficient in the internalization process, thus indicating that efp is involved in the penetration of Brucella in non-professional phagocytes." @default.
• W1998766891 created "2016-06-24" @default.
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• W1998766891 date "2012-01-01" @default.
• W1998766891 modified "2023-10-07" @default.
• W1998766891 title "Brucella abortus efp gene is required for an efficient internalization in HeLa cells" @default.
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• W1998766891 doi "https://doi.org/10.1016/j.micpath.2011.09.008" @default.
• W1998766891 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21983596" @default.
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