DegU-phosphate activates expression of the anti-sigma factor FlgM in Bacillus subtilis.

DegU-phosphate activates expression of the anti-sigma factor FlgM in Bacillus subtilis.
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DOI:
10.1111/j.1365-2958.2011.07755.x
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发表时间:
2011-08
影响因子:
3.6
通讯作者:
Kearns DB
Kearns DB
中科院分区:
生物学2区
文献类型:
--
作者:
Hsueh YH;Cozy LM;Sham LT;Calvo RA;Gutu AD;Winkler ME;Kearns DB

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细菌鞭毛是一种复杂的分子机器,由40多种蛋白质组成,并通过旋转推动细胞通过液体或固体表面。鞭毛基因的表达受到广泛的调控,以协调鞭毛在空间和时间上的组装。在枯草芽孢杆菌中,激活鞭毛细丝蛋白鞭毛蛋白(flagellin)的表达需要未知功能蛋白SwrA和SwrB以及备选sigma因子σD。在缺乏SwrA和SwrB的情况下,反应调节因子DegU的磷酸化形式通过结合PflgM启动子区域并激活抗sigma因子FlgM的表达来间接抑制σ d依赖性基因的表达。我们进一步证明,当鞭毛基底体组装被破坏时,degu - p依赖的FlgM激活对抑制鞭毛蛋白表达至关重要。在沙门氏菌之外,人们对FlgM的调控知之甚少,而FlgM表达的差异控制可能是鞭毛蛋白表达与鞭毛组装耦合的一种常见手段。
The bacterial flagellum is a complex molecular machine that is made up of over forty proteins and is rotated to propel cells either through liquids or over solid surfaces. Flagellar gene expression is extensively regulated to coordinate flagellar assembly in both space and time. In Bacillus subtilis, the proteins of unknown function, SwrA and SwrB, and the alternative sigma factor σD are required to activate expression of the flagellar filament protein, flagellin. Here we determine that in the absence of SwrA and SwrB, the phosphorylated form of the response regulator DegU inhibits σD-dependent gene expression indirectly by binding to the PflgM promoter region and activating expression of the anti-sigma factor FlgM. We further demonstrate that DegU-P-dependent activation of FlgM is essential to inhibit flagellin expression when flagellar basal body assembly is disrupted. Regulation of FlgM is poorly understood outside of Salmonella, and differential control of FlgM expression may be a common means of coupling flagellin expression to flagellar assembly.
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