L-type voltage-gated calcium channel β1-subunit (Cavβ1)

The L-type voltage-gated calcium channel β1-subunit is a cytosolic, non-pore-forming auxiliary protein encoded by the CACNB1 gene. It physically associates with the α1 pore subunit of L-type calcium channels and is vital for proper cell surface expression, assembly, and modulation of channel gating kinetics. Through protein–protein interactions, it regulates calcium influx critical for excitation-contraction coupling in muscle and for cellular signal transduction in excitable tissues. Functional disruption, knockouts, or disease-linked mutations in β1 can lead to severe cardiac or muscular pathophysiology. The β1-subunit is essential for L-type calcium channel function but is not a drug target itself; it is critical for disease biology and underlies many functional and therapeutic properties of the entire channel complex.

Other names

Cavβ1Ca_v_β1Voltage-gated calcium channel β1-subunitβ1-subunit of L-type calcium channel

For drugs targeting the L-type channel, mechanism includes: Inhibition (blockade) of calcium influx through the α1 subunit β1-subunit increases functional expression and alters gating kinetics, potentially affecting sensitivity to inhibitors