Plays a role as an intracellular lectin in the early secretory pathway. Interacts with N-acetyl-D-galactosamine and high-mannose type glycans and may also bind to O-linked glycans. Involved in the transport and sorting of glycoproteins carrying high mannose-type glycans (By similarity).
Subcellular locations: Endoplasmic reticulum-Golgi intermediate compartment membrane, Golgi apparatus membrane, Endoplasmic reticulum membrane
Ubiquitous.