Download MendeleyThe structure and function of P5A-ATPases.
Li, P., Bagenholm, V., Hagglund, P., Lindkvist-Petersson, K., Wang, K., Gourdon, P.(2024) Nat Commun 15: 9605-9605
- PubMed: 39505844
- DOI: https://doi.org/10.1038/s41467-024-53757-6
- Primary Citation of Related Structures:
8OP3, 8OP4, 8OP5, 8OP6, 8OP7, 8OP8 - PubMed Abstract:
Endoplasmic reticulum (ER) membrane resident P5A-ATPases broadly affect protein biogenesis and quality control, and yet their molecular function remains debated. Here, we report cryo-EM structures of a P5A-ATPase, CtSpf1, covering multiple transport intermediates of the E1 → E1-ATP → E1P-ADP → E1P → E2P → E2.P i → E2 → E1 cycle. In the E2P and E2.P i states a cleft spans the entire membrane, holding a polypeptide cargo molecule. The cargo includes an ER luminal extension, pinpointed as the C-terminus in the E2.P i state, which reenters the membrane in E2P. The E1 structure harbors a cytosol-facing cavity that is blocked by an insertion we refer to as the Plug-domain. The Plug-domain is nestled to key ATPase features and is displaced in the E1P-ADP and E1P states. Collectively, our findings are compatible with a broad range of proteins as cargo, with the P5A-ATPases serving a role in membrane removal of helices, although insertion/secretion cannot be excluded, as well as with a mechanistic role of the Plug-domain.
Organizational Affiliation:
Department of Experimental Medical Science, Lund University, Sölvegatan 19, SE-221 84, Lund, Sweden. ping.li@med.lu.se.
