Enables several functions, including LIM domain binding activity; nuclear receptor coactivator activity; and transmembrane transporter binding activity. Involved in cardiac muscle cell development; positive regulation of transport; and protein localization to plasma membrane. Acts upstream of or within muscle contraction. Located in Z disc. Is expressed in several structures, including alimentary system; heart; limb; musculature; and trunk somite. Human ortholog(s) of this gene implicated in arrhythmogenic right ventricular cardiomyopathy and dilated cardiomyopathy 1AA. Orthologous to human ACTN2 (actinin alpha 2). [provided by Alliance of Genome Resources, Apr 2022]