FliL Functions in Diverse Microbes to Negatively Modulate Motor Output via Its N-Terminal Region.

FliL Functions in Diverse Microbes to Negatively Modulate Motor Output via Its N-Terminal Region.
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DOI:
10.1128/mbio.00283-23
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发表时间:
2023-04-25
期刊:
影响因子:
6.4
通讯作者:
Ottemann, Karen M.
Ottemann, Karen M.
中科院分区:
生物学1区
文献类型:
--
作者:
Liu, Xiaolin;Roujeinikova, Anna;Ottemann, Karen M.

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鞭毛马达蛋白FliL在许多微生物中是保守的,但其确切作用已被不同的fliL突变表型所掩盖。我们重新分析了fliL研究的结果,发现他们利用的等位基因在保留的N端和C端区域的数量上不同。在不存在C-末端周质结构域的情况下保留N-末端胞质和跨膜螺旋(TM)区域的等位基因导致运动性的丧失,而完全缺乏N-末端区域的等位基因,独立于周质结构域,保留运动性。然后,我们在幽门螺杆菌fliL中测试了这一预测,并找到了支持这一想法的证据。该分析表明,FliL功能在细菌中可能比以前认为的更保守,它对运动性不是必需的,并且N-末端区域具有调节运动功能的负能力。
The flagellar motor protein FliL is conserved across many microbes, but its exact role has been obscured by varying fliL mutant phenotypes. We reanalyzed results from fliL studies and found they utilized alleles that differed in the amount of N- and C-terminal regions that were retained. Alleles that retain the N-terminal cytoplasmic and transmembrane helix (TM) regions in the absence of the C-terminal periplasmic domain result in loss of motility, while alleles that completely lack the N-terminal region, independent of the periplasmic domain, retain motility. We then tested this prediction in Helicobacter pylori fliL and found support for the idea. This analysis suggests that FliL function may be more conserved across bacteria than previously thought, that it is not essential for motility, and that the N-terminal region has the negative ability to regulate motor function.
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