Enables protein serine/threonine kinase activity and signaling receptor binding activity. Involved in several processes, including cell surface receptor signaling pathway; positive regulation of G protein-coupled receptor signaling pathway; and regulation of gene expression. Acts upstream of or within several processes, including cellular response to lithium ion; positive regulation of protein phosphorylation; and protein phosphorylation. Predicted to be located in microtubule. Predicted to be active in axon; cytosol; and nucleus. Is expressed in several structures, including central nervous system; cranium; early conceptus; tongue; and upper jaw. Human ortholog(s) of this gene implicated in amyotrophic lateral sclerosis. Orthologous to human GSK3A (glycogen synthase kinase 3 alpha). [provided by Alliance of Genome Resources, Apr 2022]