8f6e | pdb_00008f6e

Cryo-EM structure of a Zinc-loaded wild-type YiiP-Fab complex

spinqualitylabelsall models 8f6e, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8f6e is a 6 chain structure with sequence from Homo sapiens and Shewanella oneidensis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.8Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FIEF_SHEON Divalent metal cation transporter which exports Zn(2+), Cd(2+) and possibly Fe(2+) (PubMed:23341604, PubMed:29507252). Zn(2+)/H(+) antiporter capable of using the proton motive force to remove Zn(2+) from the cytoplasm (PubMed:34254979). May be involved in zinc and iron detoxification by efflux (By similarity).[UniProtKB:P69380] Publication Abstract from PubMed YiiP from Shewanella oneidensis is a prokaryotic Zn(2+)/H(+) antiporter that serves as a model for the Cation Diffusion Facilitator (CDF) superfamily, members of which are generally responsible for homeostasis of transition metal ions. Previous studies of YiiP as well as related CDF transporters have established a homodimeric architecture and the presence of three distinct Zn(2+) binding sites named A, B, and C. In this study, we use cryo-EM, microscale thermophoresis and molecular dynamics simulations to address the structural and functional roles of individual sites as well as the interplay between Zn(2+) binding and protonation. Structural studies indicate that site C in the cytoplasmic domain is primarily responsible for stabilizing the dimer and that site B at the cytoplasmic membrane surface controls the structural transition from an inward facing conformation to an occluded conformation. Binding data show that intramembrane site A, which is directly responsible for transport, has a dramatic pH dependence consistent with coupling to the proton motive force. A comprehensive thermodynamic model encompassing Zn(2+) binding and protonation states of individual residues indicates a transport stoichiometry of 1 Zn(2+) to 2-3 H(+) depending on the external pH. This stoichiometry would be favorable in a physiological context, allowing the cell to use the proton gradient as well as the membrane potential to drive the export of Zn(2+). Energy coupling and stoichiometry of Zn(2+)/H(+) antiport by the prokaryotic cation diffusion facilitator YiiP.,Hussein A, Fan S, Lopez-Redondo M, Kenney I, Zhang X, Beckstein O, Stokes DL Elife. 2023 Oct 31;12:RP87167. doi: 10.7554/eLife.87167. PMID:37906094 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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