Voltage-dependent L-type calcium channel subunit alpha-1S (CACNA1S)

Pore-forming, alpha-1S subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents in skeletal muscle. Calcium channels containing the alpha-1S subunit play an significant role in excitation-contraction coupling in skeletal muscle via their interaction with RYR1, which triggers Ca(2+) release from the sarcplasmic reticulum and ultimately leads to muscle contraction.

Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group. .