Download MendeleyDiverse roles of the metal binding domains and transport mechanism of copper transporting P-type ATPases.
Guo, Z., Oradd, F., Bagenholm, V., Gronberg, C., Ma, J.F., Ott, P., Wang, Y., Andersson, M., Pedersen, P.A., Wang, K., Gourdon, P.(2024) Nat Commun 15: 2690-2690
- PubMed: 38538615
- DOI: https://doi.org/10.1038/s41467-024-47001-4
- Primary Citation of Related Structures:
8Q73, 8Q74, 8Q75, 8Q76 - PubMed Abstract:
Copper transporting P-type (P 1B-1 -) ATPases are essential for cellular homeostasis. Nonetheless, the E1-E1P-E2P-E2 states mechanism of P 1B-1 -ATPases remains poorly understood. In particular, the role of the intrinsic metal binding domains (MBDs) is enigmatic. Here, four cryo-EM structures and molecular dynamics simulations of a P 1B-1 -ATPase are combined to reveal that in many eukaryotes the MBD immediately prior to the ATPase core, MBD -1 , serves a structural role, remodeling the ion-uptake region. In contrast, the MBD prior to MBD -1 , MBD -2 , likely assists in copper delivery to the ATPase core. Invariant Tyr, Asn and Ser residues in the transmembrane domain assist in positioning sulfur-providing copper-binding amino acids, allowing for copper uptake, binding and release. As such, our findings unify previously conflicting data on the transport and regulation of P 1B-1 -ATPases. The results are critical for a fundamental understanding of cellular copper homeostasis and for comprehension of the molecular bases of P 1B-1 -disorders and ongoing clinical trials.
Organizational Affiliation:
Department of Biomedical Sciences, Copenhagen University, Copenhagen, Denmark.
