Predicted to enable 1,4-alpha-oligoglucan phosphorylase activity and thymidine phosphorylase activity. Predicted to act upstream of or within pyrimidine nucleobase metabolic process and pyrimidine nucleoside metabolic process. Predicted to be active in cytosol. Human ortholog(s) of this gene implicated in lung non-small cell carcinoma; mitochondrial DNA depletion syndrome 1; mitochondrial encephalomyopathy; pancreatic cancer; and transitional cell carcinoma. Orthologous to human TYMP (thymidine phosphorylase).