L-type and N-type voltage-gated calcium channel alpha-1 subunit (CaV1.x (L-type) and CaV2.2 (N-type) alpha-1 subunit)

L-type and N-type voltage-gated calcium channel alpha-1 subunits are large, multi-pass transmembrane proteins that form the main pore-forming component of voltage-gated calcium channels, mediating calcium influx into excitable cells in response to membrane depolarization[1][2][3][4][5]. L-type channels (CaV1.x) are highly expressed in cardiac, skeletal, and smooth muscle; they trigger muscle contraction and hormone secretion. N-type channels (CaV2.2) are predominantly neuronal, where they are critical for neurotransmitter release at synapses[2][3][5]. Both classes are major pharmacological targets: L-type blockers are widely used in cardiovascular medicine, while N-type blockers are used for severe pain management. Function and pharmacology of these channels are dictated principally by the pore-forming alpha-1 subunits (encoded by CACNA1x genes), with biophysical properties modulated by auxiliary alpha2delta, beta, and gamma subunits[1][2][3]. Mutations or altered expression in alpha-1 subunits are linked to several human diseases, including cardiac arrhythmia, neurological and psychiatric disorders, and chronic pain[3].

Other names

L-type calcium channel alpha-1 subunitN-type calcium channel alpha-1 subunitCaV1.x alpha-1 subunit (where x = 1.1, 1.2, 1.3, 1.4)CaV2.2 alpha-1 subunitCACNA1C (L-type, CaV1.2 gene)CACNA1D (L-type, CaV1.3)CACNA1S (L-type, CaV1.1)CACNA1F (L-type, CaV1.4)CACNA1B (N-type, CaV2.2 gene)

Inhibition of calcium influx through channel pore (channel blockade) Allosteric modulation via accessory subunits Inhibition of presynaptic neurotransmitter release (esp. N-type)