PqsE of Pseudomonas aeruginosa Acts as Pathway-Specific Thioesterase in the Biosynthesis of Alkylquinolone Signaling Molecules
作者:Steffen Lorenz Drees、Susanne Fetzner
DOI:10.1016/j.chembiol.2015.04.012
日期:2015.5
(2-heptyl-3-hydroxy-4(1H)-quinolone) and HHQ (2-heptyl-4(1H)-quinolone) as quorum-sensing signal molecules, controlling the expression of many virulence genes as a function of cell population density. The biosynthesis of HHQ is generally accepted to require thepqsABCDgene products. We now reconstitute the biosynthetic pathway in vitro, and demonstrate that in addition to PqsABCD, PqsE has a role in HHQ synthesis. PqsE
铜绿假单胞菌将烷基喹诺酮类PQS(2-庚基-3-羟基-4(1H)-喹诺酮)和HHQ(2-庚基-4(1H)-喹诺酮)用作群体感应信号分子,控制了许多毒力基因的表达,例如细胞种群密度的函数。HHQ的生物合成被普遍接受,需要pqsABCD基因产物。我们现在在体外重建生物合成途径,并证明除PqsABCD外,PqsE在HHQ合成中也有作用。PqsE充当硫酯酶,水解生物合成中间体2-氨基苯甲酰基乙酰基辅酶A,形成HHQ和2-氨基苯乙酮的前体2-氨基苯甲酰基乙酸酯。PqsE的作用可以在某种程度上由硫特异性酯酶TesB承担,这解释了为什么PqsEdeletion突变体是P。铜绿假单胞菌素合成HHQ。有趣的是,由于2-氨基苯甲酰基乙酰基辅酶A的分子内环化,pqsEmutant产生的2,4-二羟基喹啉水平升高。总体而言,我们的数据表明PqsE促进了P中烷基喹诺酮信号分子生物合成的效率。铜绿假单胞菌能平衡源自烷