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Atypical chemoreceptor arrays accommodate high membrane curvature.


ABSTRACT: The prokaryotic chemotaxis system is arguably the best-understood signaling pathway in biology. In all previously described species, chemoreceptors organize into a hexagonal (P6 symmetry) extended array. Here, we report an alternative symmetry (P2) of the chemotaxis apparatus that emerges from a strict linear organization of the histidine kinase CheA in Treponema denticola cells, which possesses arrays with the highest native curvature investigated thus far. Using cryo-ET, we reveal that Td chemoreceptor arrays assume an unusual arrangement of the supra-molecular protein assembly that has likely evolved to accommodate the high membrane curvature. The arrays have several atypical features, such as an extended dimerization domain of CheA and a variant CheW-CheR-like fusion protein that is critical for maintaining an ordered chemosensory apparatus. Furthermore, the previously characterized Td oxygen sensor ODP influences CheA ordering. These results suggest a greater diversity of the chemotaxis signaling system than previously thought.

SUBMITTER: Muok AR 

PROVIDER: S-EPMC7666581 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Atypical chemoreceptor arrays accommodate high membrane curvature.

Muok Alise R AR   Ortega Davi R DR   Kurniyati Kurni K   Yang Wen W   Maschmann Zachary A ZA   Sidi Mabrouk Adam A   Li Chunhao C   Crane Brian R BR   Briegel Ariane A  

Nature communications 20201113 1


The prokaryotic chemotaxis system is arguably the best-understood signaling pathway in biology. In all previously described species, chemoreceptors organize into a hexagonal (P6 symmetry) extended array. Here, we report an alternative symmetry (P2) of the chemotaxis apparatus that emerges from a strict linear organization of the histidine kinase CheA in Treponema denticola cells, which possesses arrays with the highest native curvature investigated thus far. Using cryo-ET, we reveal that Td chem  ...[more]

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