Calcium channel voltage-dependent beta-2b subunit (CaVβ2b)

The **calcium channel voltage-dependent beta-2b subunit (CaVβ2b)** is a cytosolic regulatory protein encoded by the CACNB2 gene that associates with the α1 subunit of high-voltage-activated calcium channels, especially those in the CaV2 family (including N-type and R-type channels)[2][3][4]. It plays a key role in regulating channel trafficking to the plasma membrane, promoting correct folding, increasing channel density at the cell surface, and finely tuning the channels' biophysical properties such as activation and inactivation kinetics, voltage-dependence, and current amplitude[1][2][3][4]. By doing so, CaVβ2b critically influences synaptic transmission, neuronal excitability, and cellular calcium signaling. While not a direct drug target itself, its modulation of channel complexes affects the pharmacological response of voltage-gated calcium channels, and it is implicated in various disorders related to dysfunctional calcium signaling, including certain neurodegenerative and cardiovascular diseases[2][4].

Other names

Cavβ2bCalcium channel beta-2b subunitVoltage-gated calcium channel beta-2b subunitCACNB2b (gene/protein variant)

Allosteric modulation of calcium channel gating when targeted by experimental molecules Regulates channel trafficking and surface expression as part of the channel complex[2][3]