Enables 2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline decarboxylase activity. Involved in allantoin metabolic process; purine-containing compound catabolic process; and urate catabolic process. Is active in peroxisome. Orthologous to human URAD (ureidoimidazoline (2-oxo-4-hydroxy-4-carboxy-5-) decarboxylase). [provided by Alliance of Genome Resources, Apr 2022]