8GHT image
Entry Detail
PDB ID:
8GHT
EMDB ID:
Title:
Cryo-electron microscopy structure of the zinc transporter from Bordetella bronchiseptica
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-03-12
Release Date:
2023-06-21
Method Details:
Experimental Method:
Resolution:
3.05 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative membrane protein
Chain IDs:A, B
Chain Length:312
Number of Molecules:2
Biological Source:Bordetella bronchiseptica
Primary Citation
Structural mechanism of intracellular autoregulation of zinc uptake in ZIP transporters.
Nat Commun 14 3404 3404 (2023)
PMID: 37296139 DOI: 10.1038/s41467-023-39010-6

Abstact

Zinc is an essential micronutrient that supports all living organisms through regulating numerous biological processes. However, the mechanism of uptake regulation by intracellular Zn2+ status remains unclear. Here we report a cryo-electron microscopy structure of a ZIP-family transporter from Bordetella bronchiseptica at 3.05 Å resolution in an inward-facing, inhibited conformation. The transporter forms a homodimer, each protomer containing nine transmembrane helices and three metal ions. Two metal ions form a binuclear pore structure, and the third ion is located at an egress site facing the cytoplasm. The egress site is covered by a loop, and two histidine residues on the loop interact with the egress-site ion and regulate its release. Cell-based Zn2+ uptake and cell growth viability assays reveal a negative regulation of Zn2+ uptake through sensing intracellular Zn2+ status using a built-in sensor. These structural and biochemical analyses provide mechanistic insight into the autoregulation of zinc uptake across membranes.

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