The end of an old hypothesis: the pseudomonas signaling molecules 4-hydroxy-2-alkylquinolines derive from fatty acids, not 3-ketofatty acids.

The end of an old hypothesis: the pseudomonas signaling molecules 4-hydroxy-2-alkylquinolines derive from fatty acids, not 3-ketofatty acids.
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DOI:
10.1016/j.chembiol.2013.09.021
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发表时间:
2013-12-19
影响因子:
--
通讯作者:
Déziel E
Déziel E
中科院分区:
生物1区
文献类型:
--
作者:
Dulcey CE;Dekimpe V;Fauvelle DA;Milot S;Groleau MC;Doucet N;Rahme LG;Lépine F;Déziel E

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致病菌群利用扩散信号以协调一致的方式调节其毒力。铜绿假单胞菌(Pseudomonas aeruginosa)以4-羟基-2-烷基喹啉(HAQs)为唯一信号,包括HHQ和PQS。我们证明辛酸是直接掺入HHQ的。这一发现排除了长期存在的假设,即3-酮脂肪酸是haq的前体。我们发现,HAQ的生物合成需要PqsABCD酶,它通过两步途径进行:[1]PqsD介导由邻氨基苯基辅酶a和丙二酰辅酶a合成2-氨基苯甲酰乙酸酯(2- aba), b[2] 2- aba与PqsC连接的辛酸基脱羧偶联产生HHQ,这是PQS(假单胞菌喹诺酮信号)的直接前体。PqsB与PqsC紧密相关,是第二步所必需的。这一发现为开发特定的抗毒药物来对抗这种机会性病原体提供了有希望的目标。
Groups of pathogenic bacteria employ diffusible signals to regulate their virulence in a concerted manner. Pseudomonas aeruginosa uses 4-hydroxy-2-alkylquinolines (HAQs), including HHQ and PQS, as unique signals. We demonstrate that octanoic acid is directly incorporated into HHQ. This finding rules out the long-standing hypothesis that 3-ketofatty acids are the precursors of HAQs. We found that HAQ biosynthesis, which requires the PqsABCD enzymes, proceeds by a two-step pathway: [1] PqsD mediates the synthesis of 2-aminobenzoylacetate (2-ABA) from anthraniloyl-CoA and malonyl-CoA, then [2] the decarboxylating coupling of 2-ABA to an octanoate group linked to PqsC produces HHQ, the direct precursor of PQS (Pseudomonas Quinolone Signal). PqsB is tightly associated with PqsC and required for the second step. This finding uncovers promising targets for the development of specific antivirulence drugs to combat this opportunistic pathogen.
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