The exact function of the protein encoded by this gene is
not known, however, its C-terminal region shows similarity to TonB,
a bacterial protein involved in energy transduction for cobalamin
(vitamin B12) uptake. Hence, it is postulated that this protein may
have a role in the binding and intracellular trafficking of
cobalamin. Mutations in this gene are associated with methylmalonic
aciduria and homocystinuria type cblC.
