PoxA, yjeK, and elongation factor P coordinately modulate virulence and drug resistance in Salmonella enterica.

PoxA, yjeK, and elongation factor P coordinately modulate virulence and drug resistance in Salmonella enterica.
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DOI:
10.1016/j.molcel.2010.06.021
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发表时间:
2010-07-30
期刊:
影响因子:
16
通讯作者:
Fang FC
Fang FC
中科院分区:
生物学1区
文献类型:
--
作者:
Navarre WW;Zou SB;Roy H;Xie JL;Savchenko A;Singer A;Edvokimova E;Prost LR;Kumar R;Ibba M;Fang FC

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我们报告了poxA(编码赖氨酰tRNA合成酶的一部分)和紧密连锁的yjeK基因(编码假定的2,3-β-赖氨酸氨基变位酶)之间的相互作用,该基因对肠道沙门氏菌的毒力和应激抗性至关重要。沙门氏菌poxA和yjeK突变体具有广泛的表型多效性,包括小鼠毒力减弱,在营养限制条件下呼吸能力增加,对各种不同生长抑制剂的过敏性和多种蛋白质(包括SPI-1致病岛上编码的几种蛋白质)表达改变。PoxA介导细菌延伸因子P(EF-P)的翻译后修饰,类似于用羟腐胺赖氨酸修饰真核EF-P同系物eIF 5A。EF-P的修饰是一种调节机制,其中PoxA作为氨酰-tRNA合成酶,将氨基酸连接到类似tRNA的蛋白质而不是tRNA上。
We report an interaction between poxA, encoding a paralog of lysyl tRNA-synthetase, and the closely linked yjeK gene, encoding a putative 2,3-β-lysine aminomutase, that is critical for virulence and stress resistance in Salmonella enterica. Salmonella poxA and yjeK mutants share extensive phenotypic pleiotropy including attenuated virulence in mice, an increased ability to respire under nutrient limiting conditions, hypersusceptibility to a variety of diverse growth inhibitors and altered expression of multiple proteins including several encoded on the SPI-1 pathogenicity island. PoxA mediates post-translational modification of bacterial elongation factor P (EF-P), analogous to the modification of the eukaryotic EF-P homologue, eIF5A, with hypusine. The modification of EF-P is a mechanism of regulation whereby PoxA acts as an aminoacyl-tRNA synthetase that attaches an amino acid to a protein resembling tRNA rather than to a tRNA.
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