Identification of the YfgF MASE1 domain as a modulator of bacterial responses to aspartate.

Identification of the YfgF MASE1 domain as a modulator of bacterial responses to aspartate.
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DOI:
10.1098/rsob.130046
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发表时间:
2013-06-05
期刊:
影响因子:
5.8
通讯作者:
Green J
Green J
中科院分区:
生物学2区
文献类型:
--
作者:
Lacey M;Agasing A;Lowry R;Green J

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复杂的3‘-5’-环二鸟苷酸(c-di-GMP)应答调控网络在许多细菌中进化,它们受多个二鸟苷酸环化酶(DGC;GGDEF结构域蛋白)和磷酸二酯酶(PDE;EAL结构域蛋白)的作用。YfgF蛋白具有膜锚定结构域(MASE1)、催化失活的GGDEF结构域和催化活性的EAL结构域。在这里,肠沙门氏菌的持续表达。ENTERICA SER。肠炎杆菌YfgF蛋白在有氧条件下介导抑制运动琼脂上天冬氨酸趋化环的形成。这种现象是c-di-GMP不依赖的,因为它发生在一株缺乏合成c-di-GMP能力的沙门氏菌中,而且当PDE活性被EAL结构域的定点突变取消时也是如此。在外源对苯二酚引起的氧化还原环境改变中,YfgF介导的天冬氨酸趋化环形成的抑制作用受到损害。YfgF的这种抑制天冬氨酸反应的能力需要一个基序213Lys-Lys-Glu215,在MASE1结构域的跨膜区5和6之间预测的细胞质环中。因此,MASE1结构域作为细菌对天冬氨酸反应的氧化还原反应调节因子的功能首次被证明。
Complex 3′-5′-cyclic diguanylic acid (c-di-GMP) responsive regulatory networks that are modulated by the action of multiple diguanylate cyclases (DGC; GGDEF domain proteins) and phosphodiesterases (PDE; EAL domain proteins) have evolved in many bacteria. YfgF proteins possess a membrane-anchoring domain (MASE1), a catalytically inactive GGDEF domain and a catalytically active EAL domain. Here, sustained expression of the Salmonella enterica spp. Enterica ser. Enteritidis YfgF protein is shown to mediate inhibition of the formation of the aspartate chemotactic ring on motility agar under aerobic conditions. This phenomenon was c-di-GMP-independent because it occurred in a Salmonella strain that lacked the ability to synthesize c-di-GMP and also when PDE activity was abolished by site-directed mutagenesis of the EAL domain. YfgF-mediated inhibition of aspartate chemotactic ring formation was impaired in the altered redox environment generated by exogenous p-benzoquinone. This ability of YfgF to inhibit the response to aspartate required a motif, 213Lys-Lys-Glu215, in the predicted cytoplasmic loop between trans-membrane regions 5 and 6 of the MASE1 domain. Thus, for the first time the function of a MASE1 domain as a redox-responsive regulator of bacterial responses to aspartate has been shown.
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