Evolution of a large periplasmic disk in Campylobacterota flagella facilitated efficient motility alongside autoagglutination

Evolution of a large periplasmic disk in Campylobacterota flagella facilitated efficient motility alongside autoagglutination
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弯曲杆菌鞭毛中大型周质盘的进化促进了自凝集的有效运动

DOI:
10.1101/2023.09.08.556628
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发表时间:
2023
期刊:
--
影响因子:
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通讯作者:
Cohen E
Cohen E
中科院分区:
--
文献类型:
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作者:
Cohen E

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虽然大肠杆菌和沙门氏菌的鞭毛分布在细胞体周围,但许多细菌将鞭毛放在两极。这种广泛的形式的鞭毛运动是相对知之甚少,但这些极性鞭毛电机总是功能不明的周质盘结构。鞭毛电机ofCampylobacter jejuni的特点是一个100 nm宽的周质盘与脚手架一个更广泛的环的电机蛋白,以增加扭矩,但这个磁盘的大小是过度的作用,只在脚手架电机蛋白。在这里,我们表明,基盘inC。jejunis是一个凸缘,在鞭毛丝与细胞体和其他丝相互作用的解缠结期间支撑马达,这些相互作用对于宿主定殖是重要的。我们的研究结果揭示了纠缠的相互依赖的鞭毛电机结构和细胞计划的弯曲杆菌(以前epsilonproteobacteria)的演变。请注意,这份手稿有一个兄弟手稿,题为“细菌鞭毛马达原位分子模型揭示了蛋白质适应增加扭矩的“部分列表”,描述了这里讨论的空肠弯曲杆菌鞭毛马达的分子模型。
Although the bacterial flagella ofEscherichia coliandSalmonella entericaare distributed around the cell body, many bacteria instead place their flagella at their poles. This widespread form of flagellar motility is relatively poorly understood, but these polar flagellar motors invariably feature periplasmic disk structures of unknown function. The flagellar motor ofCampylobacter jejunifeatures a 100 nm-wide periplasmic disk associated with scaffolding a wider ring of motor proteins to increase torque, but the size of this disk is excessive for a role solely in scaffolding motor proteins. Here we show that the basal disk inC. jejuniis a flange that braces the motor during disentanglement of the flagellar filament from interactions with the cell body and other filaments, interactions that are otherwise important for host colonization. Our results reveal an entanglement of co-dependencies in the evolution of flagellar motor structure and cell plan in the Campylobacterota (previously epsilonproteobacteria). Note that this manuscript has a sibling manuscript titled’Molecular model of a bacterial flagellar motor in situ reveals a “parts-list” of protein adaptations to increase torque’that describes a molecular model of theCampylobacter jejuniflagellar motor discussed here.
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