Serine/threonine kinase PpkA coordinates the interplay between T6SS2 activation and quorum sensing in the marine pathogen Vibrio alginolyticus.

Serine/threonine kinase PpkA coordinates the interplay between T6SS2 activation and quorum sensing in the marine pathogen Vibrio alginolyticus.
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丝氨酸/苏氨酸激酶 PpkA 协调海洋病原体溶藻弧菌中 T6SS2 激活和群体感应之间的相互作用

DOI:
10.1111/1462-2920.14039
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发表时间:
2018-03
影响因子:
5.1
通讯作者:
Wang Q
Wang Q
中科院分区:
生物学2区
文献类型:
--
作者:
Yang Z;Zhou X;Ma Y;Zhou M;Waldor MK;Zhang Y;Wang Q

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VI型分泌系统(T6SS)是多蛋白分泌机器,其可以介导杀死细菌细胞,从而改变细菌群落的组成。控制这些杀伤机器的产生和分泌的机制尚不完全清楚,尽管在某些生物中,群体感应(QS)和PpkA激酶调节T6SS活性。在这里,我们调查控制T6S的海洋生物溶藻弧菌EPGS,它编码两个T6SS系统(T6SS1和T6SS2)。我们发现,该生物主要依赖于T6SS2的细菌间的竞争。我们进一步进行了磷酸化蛋白质组学筛选,以鉴定T6SS2连接的PpkA2激酶的底物。在T6SS 2簇内编码的PpkA2的底物以及显然与T6SS相关过程无关的蛋白质被鉴定。与其他生物类似,PpkA2自身磷酸化对T6SS2功能至关重要。值得注意的是,T6SS2簇外编码的多肽VtsR的磷酸化对于T6SS2表达和功能至关重要,因为它增强了luxR的表达,luxR是QS的关键调节因子,也促进了T6SS2基因表达。因此,PpkA2控制磷酸化级联,其介导缠绕T6SS和QS的正调控环,从而协调这些途径以增强溶藻弧菌的竞争适应性。
Type VI secretion systems (T6SS) are multiprotein secretion machines that can mediate killing of bacterial cells and thereby modify the composition of bacterial communities. The mechanisms that control the production of and secretion of these killing machines are incompletely understood, although quorum sensing (QS) and the PpkA kinase modulate T6SS activity in some organisms. Here we investigated control the T6S in the marine organism Vibrio alginolyticus EPGS, which encodes two T6SS systems (T6SS1 and T6SS2). We found that the organism principally relies on T6SS2 for interbacterial competition. We further carried out a phosphoproteomic screen to identify substrates of the T6SS2-linked PpkA2 kinase. Substrates of PpkA2 encoded within the T6SS2 cluster as well proteins that are apparently not linked to T6SS-related processes were identified. Similar to other organisms, PpkA2 autophosphorylation was critical for T6SS2 function. Notably, phosphorylation of a polypeptide encoded outside of the T6SS2 cluster, VtsR, was critical for T6SS2 expression and function because it augments the expression of luxR, a key regulator of QS that also promotes T6SS2 gene expression. Thus, PpkA2 controls a phosphorylation cascade that mediates a positive regulatory loop entwining T6SS and QS, thereby coordinating these pathways to enhance the competitive fitness of V. alginolyticus.
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