Voltage-gated calcium channel alpha1–beta protein-protein interface (CaVα1–CaVβ interface)

The voltage-gated calcium channel alpha1–beta (CaVα1–CaVβ) protein–protein interface is the binding region between the pore-forming α1 subunit and the intracellular β subunit of high-voltage activated CaV channels. This interaction is essential for trafficking of the α1 subunit to the plasma membrane, channel complex stabilization, and modulation of gating properties. The β subunit, a member of the membrane-associated guanylate kinase (MAGUK) protein family, binds to a discrete α-interaction domain (AID) on the α1 subunit via its α-binding pocket (ABP), an interaction that is highly conserved and critical for channel function[1][2][3][5]. Disruption of this interface by small molecules or stapled peptides has been shown to reduce membrane localization and functional activity of calcium channels, with potential application in treating conditions such as neuropathic pain. Agents targeting the CaVα1–CaVβ interface act as intracellular antagonists, typically interfering with protein–protein binding hot spots, and represent an emerging therapeutic strategy distinct from classical pore blockers[1][3][4]. Safety challenges center on the potential for broad disruption of calcium channel physiological roles[3][4].

Other names

CaV alpha1–beta protein–protein interfaceCaVα1–CaVβ interactionvoltage-gated calcium channel α1–β subunit interfaceCaV pore–auxiliary subunit interface

Inhibition of channel trafficking by disrupting CaVα1–CaVβ interaction; Suppression of calcium channel functional activity by destabilizing the core channel complex; Isoform-selective modulation of calcium channel subtypes by targeting protein–protein interaction