Dolichyl-diphosphooligosaccharide--protein glycosyltransferase 48 kDa subunit homolog; Essential subunit of N-oligosaccharyl transferase enzyme which catalyzes the transfer of a high mannose oligosaccharide to an asparagine residue within an Asn-X-Ser/Thr consensus motif in nascent polypeptide chains (By similarity) (426 aa)