The Small Regulatory Antisense RNA PilR Affects Pilus Formation and Cell Motility by Negatively Regulating pilA11 in Synechocystis sp. PCC 6803.

The Small Regulatory Antisense RNA PilR Affects Pilus Formation and Cell Motility by Negatively Regulating pilA11 in Synechocystis sp. PCC 6803.
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小调节性反义 RNA PilR 通过负向调节集胞藻 PCC6803 中的 pilA11 影响菌毛形成和细胞运动

DOI:
10.3389/fmicb.2018.00786
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发表时间:
2018
影响因子:
5.2
通讯作者:
Wang Q
Wang Q
中科院分区:
生物学2区
文献类型:
--
作者:
Hu J;Zhan J;Chen H;He C;Cang H;Wang Q

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菌毛存在于许多细菌的表面,在细胞运动、发病机制、生物膜的形成以及对环境变化的感知和反应中发挥着重要作用。蓝藻集胞藻模型中的细胞运动。PCC 6803依赖于2018年操纵子PilA9-PilA10-PilA11-slr2018的表达。在本研究中,我们鉴定了PilR反义RNA,该反义RNA PilR编码于前粘连蛋白编码基因PilA11的非编码链。对高表达[PilR(+)]和抑制[PilR(−)]突变株的分析表明,PilR是PilA11蛋白的直接负调控因子。尽管PilR的过表达不影响细胞生长,但它显著降低了PilA11mRNA和蛋白的水平,减少了菌毛的厚度和数量,导致细胞运动受限,集落小而清晰。抑制PilR的作用则相反。提出了PilR调控PilA9-PilA10-PilA11-slr2018操纵子表达的假说模型。这些结果为控制PilA11基因表达和细胞运动的机制增加了一层复杂性,并为sRNA和基因间隔区二级结构如何共同作用来非协调调节蓝藻操纵子中的目标基因提供了新的见解。
Pili are found on the surface of many bacteria and play important roles in cell motility, pathogenesis, biofilm formation, and sensing and reacting to environmental changes. Cell motility in the model cyanobacterium Synechocystis sp. PCC 6803 relies on expression of the putative pilA9-pilA10-pilA11-slr2018 operon. In this study, we identified the antisense RNA PilR encoded in the noncoding strand of the prepilin-encoding gene pilA11. Analysis of overexpressor [PilR(+)] and suppressor [PilR(−)] mutant strains revealed that PilR is a direct negative regulator of PilA11 protein. Although overexpression of PilR did not affect cell growth, it greatly reduced levels of pilA11 mRNA and protein and decreased both the thickness and number of pili, resulting in limited cell motility and small, distinct colonies. Suppression of PilR had the opposite effect. A hypothetical model on the regulation of pilA9-pilA10-pilA11-slr2018 operon expression by PilR was proposed. These results add a layer of complexity to the mechanisms controlling pilA11 gene expression and cell motility, and provide novel insights into how sRNA and the intergenic region secondary structures can work together to discoordinatly regulate target gene in an operon in cyanobacterium.
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