Enables cobalamin binding activity. Involved in cobalamin metabolic process. Predicted to be located in apical plasma membrane; endosome; and microvillus. Predicted to be active in extracellular space. Used to study gastritis. Human ortholog(s) of this gene implicated in congenital intrinsic factor deficiency and pernicious anemia. Orthologous to human CBLIF (cobalamin binding intrinsic factor). [provided by Alliance of Genome Resources, Apr 2022]