Voltage-gated calcium channel subunit alpha-1B (CaV2.2)

Voltage-gated calcium channel subunit alpha-1B (CaV2.2) is the pore-forming component of the N-type voltage-gated calcium channel predominantly expressed in neurons, especially at presynaptic terminals, where it mediates calcium influx in response to membrane depolarization[5][6]. This channel is crucial for triggering neurotransmitter release and thus plays a central role in synaptic transmission and nociceptive (pain) signaling pathways[5][4][6]. CaV2.2 is composed of a large α1B subunit along with auxiliary β, α2δ, and sometimes γ subunits, which regulate its trafficking, membrane localization, gating properties, and pharmacological sensitivity[5][3][2]. Its activity can be modulated by direct G-protein binding, alternative splicing, and protein-protein interactions, making it a dynamically regulated node for signal integration in the nervous system[4][2][3]. Dysregulation or genetic variation in CaV2.2 is implicated in various neurodevelopmental, epileptic, and pain-related disorders, making it an important therapeutic target; clinically, it is targeted by drugs such as ziconotide for the treatment of refractory neuropathic pain[6][4]. Modulation of CaV2.2 via gabapentinoids does not block the channel itself, but interferes with channel trafficking by binding to auxiliary α2δ subunits, further demonstrating the complexity of this target’s regulation and pharmacology[6].

Other names

N-type calcium channelCACNA1BCalcium channel, voltage-dependent, N type, alpha-1B subunit

Channel blockade (e.g., by ziconotide, ω-conotoxins), Inhibition of trafficking to presynaptic membrane (e.g., gabapentinoids via α2δ subunit interaction), Allosteric modulation, G-protein-mediated inhibition