Enables protein homodimerization activity and protein kinase C binding activity. Involved in negative regulation of ryanodine-sensitive calcium-release channel activity; regulation of cardiac muscle cell contraction; and regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion. Located in Z disc and sarcoplasmic reticulum. Biomarker of congestive heart failure and supravalvular aortic stenosis. Human ortholog(s) of this gene implicated in catecholaminergic polymorphic ventricular tachycardia 2. Orthologous to human CASQ2 (calsequestrin 2). [provided by Alliance of Genome Resources, Apr 2022]