Type IV pilus biogenesis genes and their roles in biofilm formation in the biological control agent Lysobacter enzymogenes OH11

文献类型： 外文期刊

第一作者： Xia, Jing

作者： Xia, Jing;Chen, Jiaojiao;Chen, Yuan;Qian, Guoliang;Liu, Fengquan;Liu, Fengquan

作者机构：

关键词： Type IV pilus;Lysobacter;Twitching motility;Biological control;Biofilm formation

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

ISSN： 0175-7598

年卷期： 2018 年 102 卷 2 期

页码：

收录情况： SCI

摘要： Type IV pilus (T4P) is widespread in bacteria, yet its biogenesis mechanism and functionality is only partially elucidated in a limited number of bacterial species. Here, by using strain OH11 as the model organism, we reported the identification of 26 T4P structural or functional component (SFC) proteins in the Gram-negative Lysobacter enzymogenes, which is a biocontrol agent potentially exploiting T4P-mediated twitching motility for antifungal activity. Twenty such SFC coding genes were individually knocked-out in-frame to create a T4P SFC deletion library. By using combined phenotypic and genetic approaches, we found that 14 such SFCs, which were expressed from four operons, were essential for twitching motility. These SFCs included the minor pilins (PilE(i), PilX(i), PilV(i), and FimT(i)), the anti-retraction protein PilY1(i), the platform protein PilC, the extension/extraction ATPases (PilB, PilT, and PilU), and the PilMNOPQ complex. Among these, mutation of pilT or pilU caused a hyper piliation, while the remaining 12 SFCs were indispensable for pilus formation. Ten (FimT(i), PilY1(i), PilB, PilT, PilU, and the PilMNOPQ complex) of the 14 SFC proteins, as well as PilA, were further shown to play a key role in L. enzymogenes biofilm formation. Overall, our results provide the first report to dissect the genetic basis of T4P biogenesis and its role in biofilm formation in L. enzymogenes in detail, which can serve as an alternative platform for studying T4P biogenesis and its antifungal function.

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