The beta subunit of voltage-dependent calcium channels contributes to the function of the calcium channel by increasing peak calcium current, shifting the voltage dependencies of activation and inactivation, modulating G protein inhibition and controlling the alpha-1 subunit membrane targeting. The L-type calcium channel is composed of four subunits: alpha-1, alpha-2, beta and gamma. Interacts with FASLG (By similarity). Interacts with CBARP (PubMed:24751537). Belongs to the calcium channel beta subunit family.