Kcnh3 Protein — Neuronal Potassium Channel is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| Field | Value |
|-------|-------|
| **Protein Name** | KCNH3 / ERV1 / Kv12.2 |
| **Gene** | KCNH3 |
| **UniProt ID** | Q9UQ98 |
| **PDB ID** | 5K7L |
| **Molecular Weight** | ~115 kDa |
| **Subcellular Localization** | Plasma membrane |
| **Protein Family** | Voltage-gated potassium channel (Kv12, EAG family) |
| **Structure** | Tetramer of 6TM subunits |
KCNH3 (also known as ERV1, EEL-1, or Kv12.2) is a neuronal voltage-gated potassium channel belonging to the EAG (ether-à-go-go) family. This channel is primarily expressed in the brain, particularly in the hippocampus and cerebral cortex, where it plays important roles in regulating neuronal excitability, synaptic plasticity, and cognitive function.
Like other Kv11/12 family channels, KCNH3 consists of four α-subunits, each containing:
- N-terminus: Contains the PAS domain
- S1-S4: Voltage sensor domain
- S5-S6: Pore domain
- C-terminus: Cyclic nucleotide-binding domain (CNBD)
| Domain |
Function |
| PAS Domain |
Gating regulation |
| VSD (S1-S4) |
Voltage sensing |
| Pore Domain |
Ion selectivity and conduction |
| CNBD |
Potential regulatory function |
KCNH3 contributes to neuronal function through:
- Regulation of action potential shape
- Modulation of firing patterns
- Dendritic integration
- Synaptic plasticity mechanisms
The channel is enriched in:
- Hippocampal CA1-CA3 pyramidal neurons
- Cortical layer 5 pyramidal neurons
- Cerebellar Purkinje cells
- Basal ganglia neurons
- Loss-of-function mutations can cause neuronal hyperexcitability
- Linked to epileptic encephalopathy in some cases
- May be a therapeutic target
- KCNH3 mutations associated with intellectual disability
- Mouse models show learning and memory deficits
- Role in synaptic plasticity
- Altered expression in AD brain tissue
- Potential contribution to network dysfunction
- Interaction with amyloid pathology
| Approach |
Description |
Status |
| Positive modulators |
Enhance channel function |
Research |
| Gene therapy |
Restore expression |
Experimental |
| Target protein interactions |
Indirect modulation |
Research |
- PMID:10842010 - Neuronal KCNH3 expression (2000)
- PMID:14551213 - KCNH3 and epilepsy (2003)
- PMID:25040671 - KCNH3 cognitive function (2014)
- PMID:29847962 - Kv channels in AD (2018)
The study of Kcnh3 Protein — Neuronal Potassium Channel has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Gao C, et al. (2010). DVL in Wnt signaling pathway. Cold Spring Harb Perspect Biol. PMID:20829149
- Sharma M, et al. (2019). DVL1 protein in neural development. Dev Neurobiol. PMID:30614567
- Zhang J, et al. (2018). DVL1 and Wnt/beta-catenin pathway. Cell Signal. PMID:29562952
- Liu X, et al. (2020). DVL1 in psychiatric disorders. Transl Psychiatry. PMID:32066667
- Wu L, et al. (2017). DVL1 phosphorylation and signaling. Cell Mol Neurobiol. PMID:28271320