Enables adenosylmethionine decarboxylase activity. Acts upstream of or within in utero embryonic development; spermidine biosynthetic process; and spermine biosynthetic process. Predicted to be active in cytosol. Is expressed in several structures, including alimentary system; central nervous system; cranium; respiratory system; and sensory organ. Human ortholog(s) of this gene implicated in lung non-small cell carcinoma. Orthologous to human AMD1 (adenosylmethionine decarboxylase 1). [provided by Alliance of Genome Resources, Apr 2022]