Oxylipins produced by Pseudomonas aeruginosa promote biofilm formation and virulence.

Oxylipins produced by Pseudomonas aeruginosa promote biofilm formation and virulence.
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铜绿假单胞菌产生的氧蛋白促进生物膜的形成和毒力。

DOI:
10.1038/ncomms13823
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发表时间:
2016-12-08
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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双加氧酶对不饱和脂肪酸的氧化作用在所有生物王国中都有发生,并产生生理上重要的脂质,称为氧脂素。氧化脂素在动物、植物、藻类和真菌中的生物学作用已被广泛研究,但在原核生物中的作用仍未得到充分认识。铜绿假单胞菌显示二醇合成酶活性,将几种单不饱和脂肪酸转化为单羟基和二羟基衍生物。在这里,我们发现由该活性衍生的氧化脂素抑制鞭毛驱动的运动性,并上调铜绿假单胞菌IV型菌毛依赖的抽动运动性。因此,这些氧化脂素促进细菌在微菌落中的组织,增加铜绿假单胞菌在体外和体内形成生物膜的能力(在果蝇中)。我们还证明了由铜绿假单胞菌产生的氧化脂素可促进果蝇和生菜的毒力。因此,我们的研究揭示了原核氧化脂素在细菌的生理和致病性中的作用。氧合脂肪酸被称为氧脂素,在哺乳动物、植物和真菌中起着重要作用。在这里,作者表明,由病原菌铜绿假单胞菌产生的氧化脂素,促进生物膜的形成和毒力。
The oxygenation of unsaturated fatty acids by dioxygenases occurs in all kingdoms of life and produces physiologically important lipids called oxylipins. The biological roles of oxylipins have been extensively studied in animals, plants, algae and fungi, but remain largely unidentified in prokaryotes. The bacterium Pseudomonas aeruginosa displays a diol synthase activity that transforms several monounsaturated fatty acids into mono- and di-hydroxylated derivatives. Here we show that oxylipins derived from this activity inhibit flagellum-driven motility and upregulate type IV pilus-dependent twitching motility of P. aeruginosa. Consequently, these oxylipins promote bacterial organization in microcolonies, increasing the ability of P. aeruginosa to form biofilms in vitro and in vivo (in Drosophila flies). We also demonstrate that oxylipins produced by P. aeruginosa promote virulence in Drosophila flies and lettuce. Our study thus uncovers a role for prokaryotic oxylipins in the physiology and pathogenicity of bacteria. Oxygenated fatty acids known as oxylipins play important roles in mammals, plants and fungi. Here, the authors show that oxylipins, produced by the pathogenic bacterium Pseudomonas aeruginosa, promote biofilm formation and virulence.
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