Enables protein kinase inhibitor activity. Predicted to be involved in several processes, including negative regulation of ERK1 and ERK2 cascade; negative regulation of cellular protein metabolic process; and positive regulation of insulin secretion involved in cellular response to glucose stimulus. Located in postsynaptic density. Is expressed in several structures, including brain; genitourinary system; hemolymphoid system gland; liver; and stomach. Human ortholog(s) of this gene implicated in ovarian cancer; ovarian carcinoma; and prostate adenocarcinoma. Orthologous to human CAMK2N1 (calcium/calmodulin dependent protein kinase II inhibitor 1). [provided by Alliance of Genome Resources, Apr 2022]