De novo pyrimidine synthesis is necessary for intestinal colonization of Salmonella Typhimurium in chicks.

De novo pyrimidine synthesis is necessary for intestinal colonization of Salmonella Typhimurium in chicks.
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DOI:
10.1371/journal.pone.0183751
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Andrews-Polymenis H
Andrews-Polymenis H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yang HJ;Bogomolnaya L;McClelland M;Andrews-Polymenis H

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Pre(STM3733)编码OPRTase(OPRTase;EC 2.4.2.10),它是嘧啶生物合成途径中的第五个酶。在4日龄雏鸡沙门氏菌突变体库的筛选中,我们发现了一个ΔPre突变体。在这里,我们证实了一个ΔPYRE突变体在与同基因野生型竞争感染的情况下对4日龄雏鸡的定植能力很差,并且通过提供反式PYRE的副本可以恢复该突变体对雏鸡的定植能力。我们进一步证明,我们的ΔPre突变体在体外营养不良的条件下生长不良,并且当提供嘧啶挽救途径的前体时,该突变体在体外和雏鸡中的生长能力都得到了恢复。这一发现表明,在我们感染期间,雏鸡肠道中的环境缺乏足够的嘧啶挽救途径的前体来支持沙门氏菌的生长。最后,我们发现,ΔPYRE突变体在感染过程中的定植缺陷发生在雏鸡身上,而不是在CBA/J小鼠或小牛的结扎回肠环中。我们的数据表明,从头合成的嘧啶对于鼠伤寒沙门氏菌在雏鸡体内的定植是必要的,而挽救途径在这个生态位中是不被使用的。
pyrE (STM3733) encodes orotate phosphoribosyltransferase (OPRTase; EC 2.4.2.10), the fifth enzyme of the de novo pyrimidine biosynthetic pathway. We identified a ΔpyrE mutant as under selection in screening of a Salmonella mutant library in 4-day old chicks. Here, we confirm that a ΔpyrE mutant colonizes 4-day old chicks poorly in competitive infection with isogenic wild type, and that the ability of this mutant to colonize chicks could be restored by providing a copy of pyrE in trans. We further show that our ΔpyrE mutant grows poorly in nutrient poor conditions in vitro, and that the ability of this mutant to grow is restored, both in vitro and in chicks, when precursors to the pyrimidine salvage pathway were provided. This finding suggests that the environment in the chick intestine during our infections lacks sufficient precursors of the pyrimidine salvage pathway to support Salmonella growth. Finally, we show that the colonization defect of a ΔpyrE mutant during infection occurs in to chicks, but not in CBA/J mice or ligated ileal loops in calves. Our data suggest that de novo pyrimidine synthesis is necessary for colonization of Salmonella Typhimurium in the chick, and that the salvage pathway is not used in this niche.
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