ID   OST4_DROSE              Reviewed;          40 AA.
AC   B4HSS0;
DT   03-NOV-2009, integrated into UniProtKB/Swiss-Prot.
DT   23-SEP-2008, sequence version 1.
DT   25-MAY-2022, entry version 40.
DE   RecName: Full=Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 4 {ECO:0000250|UniProtKB:Q99380};
GN   ORFNames=GM20604;
OS   Drosophila sechellia (Fruit fly).
OC   Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Hexapoda; Insecta; Pterygota;
OC   Neoptera; Endopterygota; Diptera; Brachycera; Muscomorpha; Ephydroidea;
OC   Drosophilidae; Drosophila; Sophophora.
OX   NCBI_TaxID=7238;
RN   [1] {ECO:0000312|EMBL:EDW47097.1}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Rob3c / Tucson 14021-0248.25 {ECO:0000312|EMBL:EDW47097.1};
RX   PubMed=17994087; DOI=10.1038/nature06341;
RG   Drosophila 12 genomes consortium;
RT   "Evolution of genes and genomes on the Drosophila phylogeny.";
RL   Nature 450:203-218(2007).
CC   -!- FUNCTION: Subunit of the oligosaccharyl transferase (OST) complex that
CC       catalyzes the initial transfer of a defined glycan
CC       (Glc(3)Man(9)GlcNAc(2) in eukaryotes) from the lipid carrier dolichol-
CC       pyrophosphate to an asparagine residue within an Asn-X-Ser/Thr
CC       consensus motif in nascent polypeptide chains, the first step in
CC       protein N-glycosylation. N-glycosylation occurs cotranslationally and
CC       the complex associates with the Sec61 complex at the channel-forming
CC       translocon complex that mediates protein translocation across the
CC       endoplasmic reticulum (ER). All subunits are required for a maximal
CC       enzyme activity. {ECO:0000250|UniProtKB:P0C6T2}.
CC   -!- SUBUNIT: Component of the oligosaccharyltransferase (OST) complex.
CC       {ECO:0000250|UniProtKB:P0C6T2}.
CC   -!- SUBCELLULAR LOCATION: Endoplasmic reticulum membrane {ECO:0000250};
CC       Single-pass type III membrane protein {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the OST4 family. {ECO:0000255}.
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DR   EMBL; CH480816; EDW47097.1; -; Genomic_DNA.
DR   RefSeq; XP_002033084.1; XM_002033048.1.
DR   AlphaFoldDB; B4HSS0; -.
DR   SMR; B4HSS0; -.
DR   STRING; 7238.B4HSS0; -.
DR   EnsemblMetazoa; FBtr0203589; FBpp0202081; FBgn0175486.
DR   GeneID; 6608347; -.
DR   KEGG; dse:6608347; -.
DR   HOGENOM; CLU_186352_2_0_1; -.
DR   PhylomeDB; B4HSS0; -.
DR   Proteomes; UP000001292; Unassembled WGS sequence.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0008250; C:oligosaccharyltransferase complex; ISS:UniProtKB.
DR   GO; GO:0006487; P:protein N-linked glycosylation; ISS:UniProtKB.
DR   InterPro; IPR018943; Oligosaccaryltransferase.
DR   InterPro; IPR036330; Ost4p_sf.
DR   Pfam; PF10215; Ost4; 1.
DR   SUPFAM; SSF103464; SSF103464; 1.
PE   3: Inferred from homology;
KW   Endoplasmic reticulum; Membrane; Reference proteome; Signal-anchor;
KW   Transmembrane; Transmembrane helix.
FT   CHAIN           1..40
FT                   /note="Dolichyl-diphosphooligosaccharide--protein
FT                   glycosyltransferase subunit 4"
FT                   /id="PRO_0000386614"
FT   TOPO_DOM        1..7
FT                   /note="Lumenal"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        8..28
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        29..40
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   40 AA;  4400 MW;  81F3BC3457BD2F94 CRC64;
     MITDMQLAIF SNVLGVFLFL LVVAYHYINA NTGKPSAKAK