Kv4.3 Potassium Channel Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
| KCND3 | |
|---|---|
| Protein Name | Voltage-Gated Potassium Channel Subunit Kv4.3 |
| Gene | [KCND3](/genes/kcnd3) |
| UniProt ID | [Q9Y2W9](https://www.uniprot.org/uniprot/Q9Y2W9) |
| PDB IDs | 6CX2, 5ZHW, 4W5R |
| Molecular Weight | 75.3 kDa |
| Subcellular Localization | Plasma Membrane (Dendrites) |
| Protein Family | Voltage-Gated Potassium Channel (Kv4) |
The Kv4.3 channel is a voltage-gated potassium channel that generates the transient outward current (Ito) in neurons and cardiac myocytes. Kv4.3 subunits form tetramers that co-assemble with auxiliary subunits (KChIP1-4, DPP6, DPP10) that modulate channel expression, trafficking, and properties. In neurons, Kv4.3 channels regulate action potential back-propagation, dendritic integration, and repetitive firing. They are abundant in hippocampal CA1 pyramidal neurons, cerebellar Purkinje cells, and cortical pyramidal neurons. Kv4.3 dysfunction contributes to neuronal hyperexcitability in Alzheimer's disease models.
The Kv4.3 protein belongs to the voltage-gated potassium channel superfamily with characteristic domains:
| Subunit | Function |
|---|---|
| KChIP1-4 | Increase surface expression, modulate gating |
| DPP6 | Accelerate inactivation, enhance trafficking |
| DPP10 | Similar to DPP6 |
| Compound | Mechanism | Status |
|---|---|---|
| NS5806 | Direct activator | Research |
| Dicumarol | Inhibits inactivation | Research |
| FPL 64176 | Enhances current | Research |
| Compound | Application | Status |
|---|---|---|
| 4-AP | Broad K+ blocker | Research |
| TEA | Non-selective | Research |
| Flecainide | Antiarrhythmic | Research |
The study of Kv4.3 Potassium Channel Protein 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.