Enables cystathionine beta-synthase activity. Involved in several processes, including cellular response to hypoxia; hydrogen sulfide biosynthetic process; and transsulfuration. Predicted to be located in nucleus. Predicted to be active in cytoplasm. Biomarker of hyperhomocysteinemia and vitamin B12 deficiency. Human ortholog(s) of this gene implicated in coronary artery disease; homocystinuria; hyperhomocysteinemia; malaria; and neural tube defect. Orthologous to human CBS (cystathionine beta-synthase). [provided by Alliance of Genome Resources, Apr 2022]