The capBCA Locus is Required for Intracellular Growth of Francisella tularensis LVS.

The capBCA Locus is Required for Intracellular Growth of Francisella tularensis LVS.
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DOI:
10.3389/fmicb.2011.00083
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发表时间:
2011
影响因子:
5.2
通讯作者:
Zhang JR
Zhang JR
中科院分区:
生物学2区
文献类型:
--
作者:
Su J;Asare R;Yang J;Nair MK;Mazurkiewicz JE;Abu-Kwaik Y;Zhang JR

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土拉菌是土拉菌病的病原体,也是一类生物恐怖制剂。土拉菌极端毒力的分子基础尚不清楚。我们最近的研究发现,在呼吸道感染小鼠模型中,三个相邻基因capBCA是土拉菌活疫苗株(LVS)感染所必需的。我们在这里证明了capBCA基因对于土拉菌LVS在BALB/c小鼠的肺、脾脏和肝脏的体内生长是必需的。A型菌株Schu S4中capBCA的不显著缺失导致了毒力的显著衰减,尽管在Schu S4中的衰减程度远不如LVS。我们进一步证明,在体外培养条件下,CapB蛋白在低水平产生,并且单独CapB是土拉菌LVS在BALB/c小鼠肺内生长所必需的。最后,在培养的巨噬细胞中,capB或capBCA的缺失突变显著损害了土拉菌LVS在细胞内的生长,这表明capBCA基因是土拉菌胞内适应所必需的。该基因位点在细胞内适应中的要求至少部分解释了土拉菌capBCA突变体在毒力上的显著衰减。
Francisella tularensis is the causative agent of tularemia and a category A bioterrorism agent. The molecular basis for the extreme virulence of F. tularensis remains unclear. Our recent study found that capBCA, three neighboring genes, are necessary for the infection of F. tularensis live vaccine strain (LVS) in a respiratory infection mouse model. We here show that the capBCA genes are necessary for in vivo growth of F. tularensis LVS in the lungs, spleens, and livers of BALB/c mice. Unmarked deletion of capBCA in type A strain Schu S4 resulted in significant attenuation in virulence although the level of the attenuation in Schu S4 was much less profound than in LVS. We further demonstrated that CapB protein is produced at a low level under the in vitro culture conditions, and capB alone is necessary for in vivo growth of F. tularensis LVS in the lungs of BALB/c mice. Finally, deletional mutations in capB alone or capBCA significantly impaired intracellular growth of F. tularensis LVS in cultured macrophages, thus suggesting that the capBCA genes are necessary for intracellular adaptation of F. tularensis. The requirement of this gene locus in intracellular adaption at least in part explains the significant attenuation of F. tularensis capBCA mutants in virulence.
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