Enables adenosylmethionine decarboxylase activity and putrescine binding activity. Involved in S-adenosylmethionine metabolic process; spermidine biosynthetic process; and spermine biosynthetic process. Located in cytosol. 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]