Download MendeleyStructural insights into ATP hydrolysis by the MoxR ATPase RavA and the LdcI-RavA cage-like complex.
Jessop, M., Arragain, B., Miras, R., Fraudeau, A., Huard, K., Bacia-Verloop, M., Catty, P., Felix, J., Malet, H., Gutsche, I.(2020) Commun Biol 3: 46-46
- PubMed: 31992852
- DOI: https://doi.org/10.1038/s42003-020-0772-0
- Primary Citation of Related Structures:
6Q7L, 6Q7M, 6SZA, 6SZB - PubMed Abstract:
The hexameric MoxR AAA+ ATPase RavA and the decameric lysine decarboxylase LdcI form a 3.3 MDa cage, proposed to assist assembly of specific respiratory complexes in E. coli. Here, we show that inside the LdcI-RavA cage, RavA hexamers adopt an asymmetric spiral conformation in which the nucleotide-free seam is constrained to two opposite orientations. Cryo-EM reconstructions of free RavA reveal two co-existing structural states: an asymmetric spiral, and a flat C2-symmetric closed ring characterised by two nucleotide-free seams. The closed ring RavA state bears close structural similarity to the pseudo two-fold symmetric crystal structure of the AAA+ unfoldase ClpX, suggesting a common ATPase mechanism. Based on these structures, and in light of the current knowledge regarding AAA+ ATPases, we propose different scenarios for the ATP hydrolysis cycle of free RavA and the LdcI-RavA cage-like complex, and extend the comparison to other AAA+ ATPases of clade 7.
Organizational Affiliation:
Institut de Biologie Structurale, Univ. Grenoble Alpes, CEA, CNRS, IBS, 71 Avenue des martyrs, F-38044, Grenoble, France.
