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- W2070214298 abstract "Brucella abortus is a Gram-negative, facultative intracellular bacterial pathogen of human and other animals. Brucella lipopolysaccharide has been identified as an important virulence factor. In this study, the ABC transporter ATPase gene (BAB1_0542) of B. abortus strain S2308 was inactivated by deleting a 446-bp fragment from the gene, thereby generating the mutant strain, S2308ΔATP. Real time PCR analysis confirmed the inactivation of this gene with no polar effect on the transcription of adjacent genes on the chromosome. The mutant was identified as a rough phenotype strain using heat agglutination test and crystal violet staining. The mutant strain had a different growth rate in Tryptic Soy Broth (TSB), compared to the wild type S2308 strain. Moreover, the mutant strain showed attenuated virulence in vitro and in vivo in RAW264.7 macrophages and Balb/c mice, respectively. Complementation of the mutant strain recovered the smooth phenotype of the bacteria and the complemented strain C2308ΔATP survived for more than four weeks in Balb/c mice, comparable to wild type strain S2308. Furthermore, immunization with the mutant strain protected mice from virulent strain challenge, which suggests the potential for the mutant strain S2308ΔATP as a future vaccine candidate. MHC I, MHC II and co-stimulatory molecule expression levels in mice following infection of S2308ΔATP and S2308 were also investigated." @default.
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- W2070214298 date "2013-06-01" @default.
- W2070214298 modified "2023-10-03" @default.
- W2070214298 title "Inactivation of the ABC transporter ATPase gene in Brucella abortus strain 2308 attenuated the virulence of the bacteria" @default.
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- W2070214298 doi "https://doi.org/10.1016/j.vetmic.2013.02.017" @default.
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