A type VI secretion system of Pseudomonas aeruginosa targets a toxin to bacteria.

A type VI secretion system of Pseudomonas aeruginosa targets a toxin to bacteria.
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DOI:
10.1016/j.chom.2009.12.007
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发表时间:
2010-01-21
影响因子:
30.3
通讯作者:
Mougous JD
Mougous JD
中科院分区:
医学1区
文献类型:
--
作者:
Hood RD;Singh P;Hsu F;Güvener T;Carl MA;Trinidad RR;Silverman JM;Ohlson BB;Hicks KG;Plemel RL;Li M;Schwarz S;Wang WY;Merz AJ;Goodlett DR;Mougous JD

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The functional spectrum of a secretion system is defined by its substrates. Here we analyzed the secretomes of Pseudomonas aeruginosa mutants altered in regulation of the Hcp Secretion Island-I-encoded type VI secretion system (H1-T6SS). We identified three substrates of this system, proteins Tse1-3 (type six exported 1-3), which are coregulated with the secretory apparatus and secreted under tight posttranslational control. The Tse2 protein was found to be the toxin component of a toxin-immunity system and to arrest the growth of prokaryotic and eukaryotic cells when expressed intracellularly. In contrast, secreted Tse2 had no effect on eukaryotic cells; however, it provided a major growth advantage for P. aeruginosa strains, relative to those lacking immunity, in a manner dependent on cell contact and the H1-T6SS. This demonstration that the T6SS targets a toxin to bacteria helps reconcile the structural and evolutionary relationship between the T6SS and the bacteriophage tail and spike.
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