Netherlands Organisation for Scientific Research (NWO)
184.034.014
オランダ
引用
ジャーナル: Nat Commun / 年: 2020 タイトル: Atypical chemoreceptor arrays accommodate high membrane curvature. 著者: Alise R Muok / Davi R Ortega / Kurni Kurniyati / Wen Yang / Zachary A Maschmann / Adam Sidi Mabrouk / Chunhao Li / Brian R Crane / Ariane Briegel / 要旨: 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 ...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.