Download MendeleyComplementary structures of the yeast phosphate transporter Pho90 provide insights into its transport mechanism.
Schneider, S., Kuhlbrandt, W., Yildiz, O.(2024) Structure 32: 979
- PubMed: 38688287
- DOI: https://doi.org/10.1016/j.str.2024.04.005
- Primary Citation of Related Structures:
8R33, 8R34, 8R35 - PubMed Abstract:
Phosphate homeostasis is essential for all living organisms. Low-affinity phosphate transporters are involved in phosphate import and regulation in a range of eukaryotic organisms. We have determined the structures of the Saccharomyces cerevisiae phosphate importer Pho90 by electron cryomicroscopy in two complementary states at 2.3 and 3.1 Å resolution. The symmetrical, outward-open structure in the presence of phosphate indicates bound substrate ions in the binding pocket. In the absence of phosphate, Pho90 assumes an asymmetric structure with one monomer facing inward and one monomer facing outward, providing insights into the transport mechanism. The Pho90 transport domain binds phosphate ions on one side of the membrane, then flips to the other side where the substrate is released. Together with functional experiments, these complementary structures illustrate the transport mechanism of eukaryotic low-affinity phosphate transporters.
Organizational Affiliation:
Department of Structural Biology, Max Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany.
