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Bacterial flagellar motor PL-ring disassembly subcomplexes are widespread and ancient

The bacterial flagellum is an amazing nanomachine. Understanding how such complex structures arose is crucial to our understanding of cellular evolution. We and others recently reported that in several Gammaproteobacterial species, a relic subcomplex comprising the decorated P and L rings persists i...

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Detalles Bibliográficos
Autores principales: Kaplan, Mohammed, Sweredoski, Michael J., Rodrigues, João P. G. L. M., Tocheva, Elitza I., Chang, Yi-Wei, Ortega, Davi R., Beeby, Morgan, Jensen, Grant J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7183148/
https://www.ncbi.nlm.nih.gov/pubmed/32241888
http://dx.doi.org/10.1073/pnas.1916935117
Descripción
Sumario:The bacterial flagellum is an amazing nanomachine. Understanding how such complex structures arose is crucial to our understanding of cellular evolution. We and others recently reported that in several Gammaproteobacterial species, a relic subcomplex comprising the decorated P and L rings persists in the outer membrane after flagellum disassembly. Imaging nine additional species with cryo-electron tomography, here, we show that this subcomplex persists after flagellum disassembly in other phyla as well. Bioinformatic analyses fail to show evidence of any recent horizontal transfers of the P- and L-ring genes, suggesting that this subcomplex and its persistence is an ancient and conserved feature of the flagellar motor. We hypothesize that one function of the P and L rings is to seal the outer membrane after motor disassembly.