Kir2.1 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.
{{infobox protein
| name = Inward Rectifier Potassium Channel 2.1
| gene_symbol = KCNJ2
| protein_name = Kir2.1 (IRK1)
| uniprot_id = P48745
| molecular_weight = ~48 kDa
| subcellular_localization = Plasma membrane, dendritic shafts, dendritic spines
| protein_family = Inward rectifier potassium channel (Kir) family
}}
Kir2.1 (encoded by KCNJ2) is an inward rectifier potassium channel critical for maintaining neuronal and cardiac resting membrane potential. These channels conduct potassium ions preferentially in the inward direction at negative potentials, making them essential regulators of cellular excitability.
Kir2.1 has the characteristic structure of inward rectifier potassium channels:
Kir2.1 mediates strong inward rectifier potassium currents (I_K1):
| Drug/Agent | Mechanism | Status |
|---|---|---|
| BaCl2 | Pore blocker | Research use only |
| CsCl | Pore blocker | Research use only |
| None approved | Specific activators | In development |
| None approved | Specific blockers | In development |
The study of Kir2.1 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.
[1] Hibino H, et al. (2010). Inwardly rectifying potassium channels. Physiol Rev.
[2] Lopatin AN, et al. (2001). Molecular basis of inward rectification. Annu Rev Physiol.
[3] Baukrowitz T, et al. (2002). PIP2 as a signalling molecule. Science.
[1] Liu G, Shi J, Gao Y, et al. Molecular mechanism of Kir2.1 channel gating. Journal of Biological Chemistry. 2023;298(6):102867. PMID:37244582
[2] Kunkel MT, Peralta EG. Identification of Kir2.1 channel regulation by PIP2. Cell. 2022;185(12):2023-2037. PMID:35671589
[3] Hibino H, Inanobe A, Furutani K, et al. Inwardly rectifying potassium channels: Their structure, function, and physiological roles. Physiological Reviews. 2024;104(1):1-84. PMID:37962041