Oligosaccharyltransferase complex subunit OSTC (OSTC)

May act as substrate-specific component of the N- oligosaccharyl transferase (OST) complex which catalyzes the transfer of a high mannose oligosaccharide from a lipid-linked oligosaccharide donor to an asparagine residue within an Asn-X- Ser/Thr consensus motif in nascent polypeptide chains. May be involved in N-glycosylation of APP (amyloid-beta precursor protein).

Can modulate gamma-secretase cleavage of APP by enhancing endoprotelysis of PSEN1. .