STT3A — STT3 oligosaccharyltransferase complex catalytic subunit A
STT3A belongs to a gene co-expression module in 3 of 28 SCUBA cell types. Each module groups genes that rise and fall together in that cell type; the genes it shares a module with are its closest co-expression partners there.
STT3A's module in each cell type
| Cell type | Module | Shares the module with | |
|---|---|---|---|
| Gamma-delta T cells | ER Glycoprotein Quality Control Protein processing & ER | APOL2, BAG6, CALR, ELP3, GBP1, GBP2, GBP4, HEXB +9 more | |
| Macrophages | ER Protein Quality Control Lysosomal & pahgocytosis | ACP2, C5orf15, CLN5, CS, CTBP1, ERGIC3, FUT11, GANAB +18 more | View in SCUBA |
| Mucosal-associated invariant T cell | Chromatin Remodeling DNA/chromatin regulation | ANP32E, ARHGAP30, CANX, DCTN1, EPRS1, FLII, HK1, JAK3 +9 more |
About the gene
| Synonyms | ITM1, MGC9042, STT3-A, TMC |
|---|---|
| Chromosome | 11: 125591712-125625215 |
| Predicted location | Membrane |
| Essential gene | No |
| Protein class | Cancer-related genes, Disease related genes, Enzymes, Human disease related genes, Metabolic proteins, Potential drug targets, Predicted membrane proteins, Transporters |
| Molecular function | Glycosyltransferase, Transferase |
Function
Catalytic subunit of the oligosaccharyl transferase (OST) complex that catalyzes the initial transfer of a defined glycan (Glc(3)Man(9)GlcNAc(2) in eukaryotes) from the lipid carrier dolichol- pyrophosphate to an asparagine residue within an Asn-X-Ser/Thr consensus motif in nascent polypeptide chains, the first step in protein N-glycosylation. N- glycosylation occurs cotranslationally and the complex associates with the Sec61 complex at the channel-forming translocon complex that mediates protein translocation across the endoplasmic reticulum (ER). All subunits are required for a maximal enzyme activity. This subunit contains the active site and the acceptor peptide and donor lipid-linked oligosaccharide (LLO) binding pockets. STT3A is present in the majority of OST complexes and mediates cotranslational N-glycosylation of most sites on target proteins, while STT3B-containing complexes are required for efficient post-translational glycosylation and mediate glycosylation of sites that have been skipped by STT3A. STT3A-containing OST-A complex is also required to prevent hyperglycosylation of some target proteins by preventing glycosylation of facultative sites before folding of target proteins is completed.
Human Protein Atlas · Open Targets · UniProt
Gene annotation from the Human Protein Atlas and UniProt; see sources & licences.