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Nitrite-Oxidizing Bacterium Nitrobacter winogradskyi Produces N-Acyl-Homoserine Lactone Autoinducers

机译:亚硝酸盐氧化细菌Winogradskyi硝化细菌生产N-酰基-高丝氨酸内酯自动诱导剂

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Nitrobacter winogradskyi is a chemolithotrophic bacterium that plays a role in the nitrogen cycle by oxidizing nitrite to nitrate. Here, we demonstrate a functional N -acyl-homoserine lactone (acyl-HSL) synthase in this bacterium. The N. winogradskyi genome contains genes encoding a putative acyl-HSL autoinducer synthase (nwi0626, nwiI ) and a putative acyl-HSL autoinducer receptor (nwi0627, nwiR ) with amino acid sequences 38 to 78% identical to those in Rhodopseudomonas palustris and other Rhizobiales . Expression of nwiI and nwiR correlated with acyl-HSL production during culture. N. winogradskyi produces two distinct acyl-HSLs, N -decanoyl-l-homoserine lactone (C_(10)-HSL) and a monounsaturated acyl-HSL (C_(10:1)-HSL), in a cell-density- and growth phase-dependent manner, during batch and chemostat culture. The acyl-HSLs were detected by bioassay and identified by ultraperformance liquid chromatography with information-dependent acquisition mass spectrometry (UPLC-IDA-MS). The C=C bond in C_(10:1)-HSL was confirmed by conversion into bromohydrin and detection by UPLC-IDA-MS.
机译:Winogradskyi硝化细菌是一种化学营养型细菌,通过将亚硝酸盐氧化为硝酸盐而在氮循环中起作用。在这里,我们展示了这种细菌中的功能性N-酰基高丝氨酸内酯(酰基-HSL)合酶。 N. winogradskyi基因组包含编码假定的酰基-HSL自动诱导剂合酶(nwi0626,nwiI)和假定的酰基-HSL自动诱导剂受体(nwi0627,nwiR)的基因,其氨基酸序列与大红假单胞菌和其他根瘤菌的氨基酸序列相同,为38%至78% 。在培养过程中,nwiI和nwiR的表达与酰基-HSL的产生有关。 N. winogradskyi产生两个不同的酰基-HSL,N-癸酰基-1-高丝氨酸内酯(C_(10)-HSL)和单不饱和酰基-HSL(C_(10:1)-HSL),且细胞密度和在分批和化学恒温培养期间,生长阶段依赖方式。通过生物测定法检测酰基-HSL,并通过超高效液相色谱与信息依赖的采集质谱法(UPLC-IDA-MS)进行鉴定。通过转化为溴代醇并通过UPLC-IDA-MS检测,证实了C_(10:1)-HSL中的C = C键。

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