CACNB2, also known as Calcium Channel Voltage-Dependent Beta 2 Subunit, is a protein that plays a key role in the function of voltage-gated calcium channels (VGCCs). These channels regulate calcium entry into cells in response to changes in membrane potential, influencing vital processes such as neurotransmitter release, muscle contraction, and gene expression. CACNB2 serves primarily as a regulatory subunit of VGCCs, interacting with the pore-forming alpha subunits to modulate their voltage sensitivity, channel opening and closing kinetics, and calcium conductance.