Whole cell screen for inhibitors of pH homeostasis in Mycobacterium tuberculosis.

Whole cell screen for inhibitors of pH homeostasis in Mycobacterium tuberculosis.
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DOI:
10.1371/journal.pone.0068942
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Nathan C
Nathan C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Darby CM;Ingólfsson HI;Jiang X;Shen C;Sun M;Zhao N;Burns K;Liu G;Ehrt S;Warren JD;Andersen OS;Brickner SJ;Nathan C

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细菌病原体如结核分枝杆菌(Mtb)在宿主中遇到酸性微环境,必须维持其酸碱平衡才能生存。遗传筛选鉴定出两种在酸性环境中不能控制细菌内pH(pHIB)的Mtb菌株;感染任一菌株均导致小鼠严重减毒。为了寻找Mtb在低pH下生存所需的其他蛋白质,我们引入了全细胞筛选破坏pHIB的化合物,沿着识别离子载体和膜扰动物的反筛选。将这些方法应用于天然产物文库鉴定了四种感兴趣的化合物,其中一种可能抑制新途径。这种方法产生的化合物可能导致识别允许结核分枝杆菌在酸性环境中生存的途径,在这种环境中,结核分枝杆菌对目前用于治疗结核病的大多数药物具有耐药性。
Bacterial pathogens like Mycobacterium tuberculosis (Mtb) encounter acidic microenvironments in the host and must maintain their acid-base homeostasis to survive. A genetic screen identified two Mtb strains that cannot control intrabacterial pH (pHIB) in an acidic environment; infection with either strain led to severe attenuation in mice. To search for additional proteins that Mtb requires to survive at low pH, we introduced a whole-cell screen for compounds that disrupt pHIB, along with counter-screens that identify ionophores and membrane perturbors. Application of these methods to a natural product library identified four compounds of interest, one of which may inhibit novel pathway(s). This approach yields compounds that may lead to the identification of pathways that allow Mtb to survive in acidic environments, a setting in which Mtb is resistant to most of the drugs currently used to treat tuberculosis.
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