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IPR021149 is a Oligosaccharyl transferase complex, subunit OST3/OST6.
<p>During N-linked glycosylation of proteins, oligosaccharide chains are assembled on the carrier molecule dolichyl pyrophosphate in the following order: 2 molecules of N-acetylglucosamine (GlcNAc), 9 molecules of mannose, and 3 molecules of glucose. These 14-residue oligosaccharide cores are then transferred to asparagine residues on nascent polypeptide chains in the endoplasmic reticulum (ER). As proteins progress through the Golgi apparatus, the oligosaccharide cores are modified by trimming and extension to generate a diverse array of glycosylated proteins [[cite:PUB00054185], [cite:PUB00020140]].</p> <p>The oligosaccharyl transferase complex (OST complex) [ec:2.4.1.119] transfers 14-sugar branched oligosaccharides from dolichyl pyrophosphate to asparagine residues [[cite:PUB00008612]]. The complex contains nine protein subunits: Ost1p, Ost2p, Ost3p, Ost4p, Ost5p, Ost6p, Stt3p, Swp1p, and Wbp1p, all of which are integral membrane proteins of the ER. The OST complex interacts with the Sec61p pore complex [[cite:PUB00054184]] involved in protein import into the ER.</p> <p>This entry represents subunits OST3 and OST6. OST3 is homologous to OST6 [[cite:PUB00008613]], and several lines of evidence indicate that they are alternative members of the OST complex. Disruption of both OST3 and OST6 causes severe underglycosylation of soluble and membrane-bound glycoproteins and a defect in the assembly of the complex. Hence, the function of these genes seems to be essential for recruiting a fully active complex necessary for efficient N-glycosylation [[cite:PUB00008613]]. This entry also includes the magnesium transporter protein 1, also known as OST3 homologue B, which might be involved in N-glycosylation through its association with the oligosaccharyl transferase (OST) complex.</p>
This description is obtained from EB-eye REST.
| Transcript | Name | Description | Predicted domains | Domain count |
|---|---|---|---|---|
| – | Oligosaccharyltransferase complex subunit OSTC [Medicago truncatula] gi|357449673|ref|XP_003595113.1| | 7 | ||
| – | PREDICTED: probable dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 3B-like [Cicer arietinum] gi|502119897|ref|XP_004496772.1| | 14 | ||
| – | Oligosaccharyltransferase complex subunit OSTC [Medicago truncatula] gi|357449673|ref|XP_003595113.1| | 8 | ||
| – | Magnesium transporter protein 1; TAIR: AT1G61790.1 Oligosaccharyltransferase complex/magnesium transporter family protein; Swiss-Prot: sp|Q9SYB5|OST3B_ARATH Probable dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 3B; TrEMBL-Plants: tr|A0A151U703|A0A151U703_CAJCA Uncharacterized protein ZK686.3 family; Found in the gene: LotjaGi5g1v0317500 | 16 | ||
| – | Magnesium transporter protein 1; TAIR: AT1G61790.1 Oligosaccharyltransferase complex/magnesium transporter family protein; Swiss-Prot: sp|Q9SYB5|OST3B_ARATH Probable dolichyl-diphosphooligosaccharide--protein glycosyltransferase subunit 3B; TrEMBL-Plants: tr|A0A151U703|A0A151U703_CAJCA Uncharacterized protein ZK686.3 family; Found in the gene: LotjaGi5g1v0317500 | 16 | ||
| – | Oligosaccharyltransferase complex subunit OSTC-like protein; TAIR: AT4G29870.1 Oligosaccharyltransferase complex/magnesium transporter family protein; Swiss-Prot: sp|Q5M9B7|OSTCB_XENLA Oligosaccharyltransferase complex subunit ostc-B; TrEMBL-Plants: tr|G7IIC1|G7IIC1_MEDTR Oligosaccharyltransferase complex subunit OSTC-like protein; Found in the gene: LotjaGi6g1v0233700 | 10 |
A list of co-occurring predicted domains within the L. japonicus gene space:
| Predicted domain | Source | Observations | Saturation (%) |
|---|---|---|---|
| mobidb-lite | MobiDBLite | 1 | 16.67 |