SH3 and cysteine-rich domain-containing protein (STAC)

Promotes expression of this ion channel CACNA1H at the cell membrane, and thereby contributes to the regulation of channel activity. Plays a minor and redundant function in promoting the expression of calcium channel CACNA1S at the cell membrane, and thereby results in increased channel activity.

Slows down the inactivation rate of the calcium channel CACNA1C. .