KCNE2 (Potassium voltage-gated channel subfamily E member 2, also known as MinK-Related Peptide 1 or MiRP1) is a regulatory subunit of multiple potassium channels that plays essential roles in cardiac repolarization and neuronal excitability. This protein is implicated in neurodegenerative diseases through its modulatory effects on potassium channel function.
KCNE2 is a member of the KCNE family of single transmembrane domain proteins that function as auxiliary subunits of voltage-gated potassium channels. Unlike the Kv beta subunits, KCNE proteins have a distinct structure with a single transmembrane helix and extracellular N-terminus[1].
KCNE2 is uniquely versatile among KCNE family members because it can associate with multiple different potassium channel alpha subunits, including KCNQ1 (Kv7.1), hERG (KCNH2), and various Kv channels. This broad interaction profile makes KCNE2 particularly important for cellular excitability in multiple tissues.
| Attribute | Value |
|---|---|
| Protein Name | Potassium voltage-gated channel subfamily E member 2 |
| Gene | KCNE2 |
| UniProt ID | P31645 |
| PDB ID | 2KPL |
| Molecular Weight | 14.7 kDa |
| Subcellular Localization | Plasma membrane |
| Protein Family | KCNE family (MinK-like) |
| Tissue Expression | Heart, Brain (cortex, hippocampus), Skeletal muscle, Stomach |
KCNE2 is a type I membrane protein with a distinctive architecture:
The transmembrane domain of KCNE2 allows it to co-assemble with partner alpha subunits in a 2:2 stoichiometry, forming heterotetrameric channel complexes with unique gating properties[2].
KCNE2 modulates potassium channels through several mechanisms:
KCNE2 is implicated in Alzheimer's disease through[3]:
In Parkinson's disease, KCNE2 affects:
KCNE2 mutations have been associated with epilepsy susceptibility, reflecting its critical role in neuronal excitability control[4].
Given its dual role in cardiac and neuronal excitability, KCNE2 may provide a mechanistic link between cardiovascular dysfunction and neurodegenerative diseases.
KCNE2 interacts with multiple potassium channel alpha subunits:
Key milestones in KCNE2 research:
The study of Kcne2 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.