Enables calcium channel regulator activity. Involved in regulation of calcium ion transmembrane transport via high voltage-gated calcium channel. Part of L-type voltage-gated calcium channel complex. Human ortholog(s) of this gene implicated in malignant hyperthermia. Orthologous to human CACNG1 (calcium voltage-gated channel auxiliary subunit gamma 1). [provided by Alliance of Genome Resources, Apr 2022]