ID   OST4_DROWI              Reviewed;          40 AA.
AC   B4MJN5;
DT   03-NOV-2009, integrated into UniProtKB/Swiss-Prot.
DT   03-NOV-2009, sequence version 2.
DT   25-MAY-2022, entry version 44.
DE   RecName: Full=Dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 4 {ECO:0000250|UniProtKB:Q99380};
GN   ORFNames=GK20863;
OS   Drosophila willistoni (Fruit fly).
OC   Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Hexapoda; Insecta; Pterygota;
OC   Neoptera; Endopterygota; Diptera; Brachycera; Muscomorpha; Ephydroidea;
OC   Drosophilidae; Drosophila; Sophophora.
OX   NCBI_TaxID=7260;
RN   [1] {ECO:0000312|EMBL:EDW72324.1}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Tucson 14030-0811.24 {ECO:0000312|EMBL:EDW72324.1};
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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=EDW72324.1; Type=Erroneous gene model prediction; Evidence={ECO:0000305};
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DR   EMBL; CH963846; EDW72324.1; ALT_SEQ; Genomic_DNA.
DR   RefSeq; XP_002061338.2; XM_002061302.2.
DR   AlphaFoldDB; B4MJN5; -.
DR   SMR; B4MJN5; -.
DR   GeneID; 6638468; -.
DR   KEGG; dwi:6638468; -.
DR   InParanoid; B4MJN5; -.
DR   Proteomes; UP000007798; 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_0000386617"
FT   TOPO_DOM        1..4
FT                   /note="Lumenal"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        5..25
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TOPO_DOM        26..40
FT                   /note="Cytoplasmic"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   40 AA;  4380 MW;  81F3BC3BEE3B4F94 CRC64;
     MITDVQLAIF SNVLGVFLFL LVVAYHYINA NTGKIGPKAK