Enables calcium ion binding activity and methylated-DNA-[protein]-cysteine S-methyltransferase activity. Involved in several processes, including DNA dealkylation involved in DNA repair; cellular response to ionizing radiation; and response to folic acid. Located in nucleus. Biomarker of colon adenocarcinoma and melanoma. Human ortholog(s) of this gene implicated in several diseases, including carcinoma (multiple); endocrine gland cancer (multiple); granulosa cell tumor; nervous system cancer (multiple); and urinary bladder cancer. Orthologous to human MGMT (O-6-methylguanine-DNA methyltransferase). [provided by Alliance of Genome Resources, Apr 2022]