8ZTS image
Deposition Date 2024-06-07
Release Date 2024-11-27
Last Version Date 2025-06-25
Entry Detail
PDB ID:
8ZTS
Title:
Cryo-EM structure of the ZAC zinc-activated channel in amphipol
Biological Source:
Source Organism:
Oryzias latipes (Taxon ID: 8090)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ZAC
Chain IDs:A, B, C, D, E
Chain Length:417
Number of Molecules:5
Biological Source:Oryzias latipes
Ligand Molecules
Primary Citation
Cryo-EM structure of the zinc-activated channel (ZAC) in the Cys-loop receptor superfamily.
Proc.Natl.Acad.Sci.USA 121 e2405659121 e2405659121 (2024)
PMID: 39441630 DOI: 10.1073/pnas.2405659121

Abstact

Cys-loop receptors are a large superfamily of pentameric ligand-gated ion channels with various physiological roles, especially in neurotransmission in the central nervous system. Among them, zinc-activated channel (ZAC) is a Zn2+-activated ion channel that is widely expressed in the human body and is conserved among eukaryotes. Due to its gating by extracellular Zn2+, ZAC has been considered a Zn2+ sensor, but it has undergone minimal structural and functional characterization since its molecular cloning. Among the families in the Cys-loop receptor superfamily, only the structure of ZAC has yet to be determined. Here, we determined the cryo-EM structure of ZAC in the apo state and performed structure-based mutation analyses. We identified a few residues in the extracellular domain whose mutations had a mild impact on Zn2+ sensitivity. The constriction site in the ion-conducting pore differs from the one in other Cys-loop receptor structures, and further mutational analysis identified a key residue that is important for ion selectivity. In summary, our work provides a structural framework for understanding the ion-conducting mechanism of ZAC.

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