The oligosaccharyltransferase complex (OST) is an evolutionary conserved multi-protein complex that catalyzes the addition of glycans to selected Asn residues within nascent polypeptides in the lumen of the endoplasmic reticulum (reviewed by Harada et al 2019; PMID:31810196). Mammalian cells express two distinct OST complexes that contain STT3A or STT3B as the catalytic subunit and several accessory proteins: six common subunits, two STT3A-OST-specific subunits and two STT3B-OST-specific subunits (PMID:3181019). The OST complex has not yet been studied in detail in Drosophila melanogaster, though Yamamoto-Hino et al 2015 (FBrf0228609) listed 7 subunits: CG33303, Dad1, Ost48, OstDelta, Ostgamma, Stt3A and Stt3B. I used 3 additional sources to compile a full list of candidate D. melanogaster OST subunits: 1. Current Gene Ontology (GO) annotations to fly genes using the terms "oligosaccharyltransferase complex" (GO:0008250) and "dolichyl-diphosphooligosaccharide-protein glycotransferase activity" (GO:0004579). 2. D. melanogaster orthologs of human OST subunits (determined using the DIOPT tool) described in PMID:31810196. 3. D. melanogaster orthologs of human OST subunits (determined using the HCOP tool) listed in the OST gene group at the HGNC site (https://www.genenames.org/data/genegroup/#!/group/445) The resulting list of 11 D. melanogaster genes is: FBgn gene_sym human_ortholog FBgn0031149 Stt3A STT3A FBgn0011336 Stt3B STT3B FBgn0053303 CG33303 RPN1 FBgn0034277 OstDelta RPN2 FBgn0036667 kud TMEM258 FBgn0263852 Dad1 DAD1 FBgn0014868 Ost48 DDOST FBgn0053774 CG33774 OST4 FBgn0031529 CG9662 OSTC FBgn0051460 CG31460 KRTCAP2 FBgn0032015 Ostgamma TUSC3/MAGT1
