8HTT image
Entry Detail
PDB ID:
8HTT
EMDB ID:
Title:
Cryo-EM structure of human TMEM87A, gluconate-bound
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2022-12-21
Release Date:
2023-12-27
Method Details:
Experimental Method:
Resolution:
3.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Transmembrane protein 87A,EGFP
Chain IDs:A (auth: B)
Chain Length:864
Number of Molecules:1
Biological Source:Homo sapiens, Human adenovirus 2
Ligand Molecules
Primary Citation
GolpHCat (TMEM87A), a unique voltage-dependent cation channel in Golgi apparatus, contributes to Golgi-pH maintenance and hippocampus-dependent memory.
Nat Commun 15 5830 5830 (2024)
PMID: 38992057 DOI: 10.1038/s41467-024-49297-8

Abstact

Impaired ion channels regulating Golgi pH lead to structural alterations in the Golgi apparatus, such as fragmentation, which is found, along with cognitive impairment, in Alzheimer's disease. However, the causal relationship between altered Golgi structure and cognitive impairment remains elusive due to the lack of understanding of ion channels in the Golgi apparatus of brain cells. Here, we identify that a transmembrane protein TMEM87A, renamed Golgi-pH-regulating cation channel (GolpHCat), expressed in astrocytes and neurons that contributes to hippocampus-dependent memory. We find that GolpHCat displays unique voltage-dependent currents, which is potently inhibited by gluconate. Additionally, we gain structural insights into the ion conduction through GolpHCat at the molecular level by determining three high-resolution cryogenic-electron microscopy structures of human GolpHCat. GolpHCat-knockout mice show fragmented Golgi morphology and altered protein glycosylation and functions in the hippocampus, leading to impaired spatial memory. These findings suggest a molecular target for Golgi-related diseases and cognitive impairment.

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Primary Citation of related structures