Download MendeleyAtypical chemoreceptor arrays accommodate high membrane curvature.
Muok, A.R., Ortega, D.R., Kurniyati, K., Yang, W., Maschmann, Z.A., Sidi Mabrouk, A., Li, C., Crane, B.R., Briegel, A.(2020) Nat Commun 11: 5763-5763
- PubMed: 33188180
- DOI: https://doi.org/10.1038/s41467-020-19628-6
- Primary Citation of Related Structures:
6Y1Y - PubMed 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.
Organizational Affiliation:
Institute for Biology, Leiden University, Sylviusweg 72, 2333 BE, Leiden, Netherlands.
