Antituberculosis thiophenes define a requirement for Pks13 in mycolic acid biosynthesis.

Antituberculosis thiophenes define a requirement for Pks13 in mycolic acid biosynthesis.
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DOI:
10.1038/nchembio.1277
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发表时间:
2013-08
影响因子:
14.8
通讯作者:
Alland D
Alland D
中科院分区:
生物学1区
文献类型:
--
作者:
Wilson R;Kumar P;Parashar V;Vilchèze C;Veyron-Churlet R;Freundlich JS;Barnes SW;Walker JR;Szymonifka MJ;Marchiano E;Shenai S;Colangeli R;Jacobs WR Jr;Neiditch MB;Kremer L;Alland D

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我们报道了一类新的噻吩(TP)化合物,通过抑制Pks 13的新机制杀死结核分枝杆菌(Mtb)。在Pks 13的催化Ser-55位点附近的F79 S突变赋予结核分枝杆菌TP抗性。野生型pks 13的过表达导致TP抗性,而F79 S pks 13突变体的过表达赋予高水平的抗性。在体外,TP抑制脂肪酰AMP加载到PKS 13。TP抑制野生型结核分枝杆菌分枝菌酸的生物合成,但在TP耐药结核分枝杆菌的程度要小得多。TP治疗是杀菌的,相当于一线药物异烟肼,但它不太可能允许出现耐药性。异烟肼和TP联合处理具有杀菌活性。计算对接确定了一个可能的TP结合沟内的Pks 13 ACP结构域。这项研究证实了Mtb Pks 13是分枝菌酸生物合成所必需的,验证了它作为一个可药物化的靶点,并证明了在同一生物合成途径中同时抑制多个靶点的治疗潜力。
We report a new class of thiophene (TP) compounds that kill Mycobacterium tuberculosis (Mtb) by the novel mechanism of Pks13 inhibition. An F79S mutation near the catalytic Ser-55 site in Pks13 conferred TP-resistance in Mtb. Over-expression of wild-type pks13 resulted in TP-resistance and over-expression of the F79S pks13 mutant conferred high-level resistance. In vitro, TP inhibited fatty acyl-AMP loading onto Pks13. TP inhibited mycolic acid biosynthesis in wild-type Mtb, but to a much lesser extent in TP-resistant Mtb. TP treatment was bactericidal and equivalent to the first-line drug isoniazid, but it was less likely to permit emergent resistance. Combined isoniazid and TP treatment exhibited sterilizing activity. Computational-docking identified a possible TP-binding groove within the Pks13 ACP domain. This study confirms that Mtb Pks13 is required for mycolic acid biosynthesis, validates it as a druggable target and demonstrates the therapeutic potential of simultaneously inhibiting multiple targets in the same biosynthetic pathway.
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