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- W2902006194 abstract "Glycosylation of asparagine residues is a ubiquitous protein modification. This N-glycosylation is essential in Eukaryotes, but principally nonessential in Prokaryotes (Archaea and Eubacteria), although it facilitates their survival and pathogenicity. In many reviews, Archaea have received far less attention than Eubacteria, but this review will cover the N-glycosylation in the three domains of life. The oligosaccharide chain is preassembled on a lipid-phospho carrier to form a donor substrate, lipid-linked oligosaccharide (LLO). The en bloc transfer of an oligosaccharide from LLO to selected Asn residues in the Asn-X-Ser/Thr (X≠Pro) sequons in a polypeptide chain is catalyzed by a membrane-bound enzyme, oligosaccharyltransferase (OST). Over the last 10 years, the three-dimensional structures of the catalytic subunits of the Stt3/AglB/PglB proteins, with an acceptor peptide and a donor LLO, have been determined by X-ray crystallography, and recently the complex structures with other subunits have been determined by cryo-electron microscopyElectron microscopy (EM) electron microscopy . Structural comparisons within the same species and across the different domains of life yielded a unified view of the structures and functions of OSTs. A catalytic structure in the TM region accounts for the amide bond twisting, which increases the reactivity of the side-chain nitrogen atom of the acceptor Asn residue in the sequon. The Ser/Thr-binding pocket in the C-terminal domain explains the requirement for hydroxy amino acid residues in the sequon. As expected, the two functional structures are formed by the involvement of short amino acid motifs conserved across the three domains of life." @default.
- W2902006194 created "2018-12-11" @default.
- W2902006194 creator A5083171167 @default.
- W2902006194 date "2018-01-01" @default.
- W2902006194 modified "2023-10-18" @default.
- W2902006194 title "Structural Basis of Protein Asn-Glycosylation by Oligosaccharyltransferases" @default.
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- W2902006194 doi "https://doi.org/10.1007/978-981-13-2158-0_9" @default.
- W2902006194 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30484249" @default.
- W2902006194 hasPublicationYear "2018" @default.
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