Transmembrane protein 258

Definition:

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. Involved in ER homeostasis in the colonic epithelium (By similarity).

References:

[1]. Vincent A Blomen, et al. Gene essentiality and synthetic lethality in haploid human cells. Science. 2015 Nov 27;350(6264):1092-6. [Content Brief]

[2]. Ana S Ramírez, et al. Cryo-electron microscopy structures of human oligosaccharyltransferase complexes OST-A and OST-B. Science. 2019 Dec 13;366(6471):1372-1375. [Content Brief]

[3]. Daniel B Graham, et al. TMEM258 Is a Component of the Oligosaccharyltransferase Complex Controlling ER Stress and Intestinal Inflammation. Cell Rep. 2016 Dec 13;17(11):2955-2965. [Content Brief]

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