This entry consists of the oligosaccharyl transferase STT3 subunit and related proteins. The STT3 subunit is part of the oligosaccharyl transferase (OTase) complex of proteins and is required for its activity [2]. In eukaryotes, OTase transfers a l ...
This entry consists of the oligosaccharyl transferase STT3 subunit and related proteins. The STT3 subunit is part of the oligosaccharyl transferase (OTase) complex of proteins and is required for its activity [2]. In eukaryotes, OTase transfers a lipid-linked core-oligosaccharide to selected asparagine residues in the ER [2]. In the archaea STT3 occurs alone, rather than in an OTase complex, and is required for N-glycosylation of asparagines [3-4]. This entry represents the N-terminal domain, consisting of transmembrane helices.
This entry represents the C-terminal core domain found in the oligosaccharyl transferase STT3 subunit and related proteins, such as bacterial PglB and archaeal AlgB. STT3 is part of the oligosccharyl transferase (OTase) complex and required for its a ...
This entry represents the C-terminal core domain found in the oligosaccharyl transferase STT3 subunit and related proteins, such as bacterial PglB and archaeal AlgB. STT3 is part of the oligosccharyl transferase (OTase) complex and required for its activity, which transfers a lipid-linked core-oligosaccharide to selected asparagine residues in the ER. In the archaea STT3 occurs alone, rather than in an OTase complex, and is required for N-glycosylation of asparagines [1-5]. This is a globular domain which adopts a mixed alpha/beta fold and contains the highly conserved WWDYG motif, in which the aspartate residue is thought to function as a catalytic residue [1-5].
Asparagine-linked glycosylation is a post-translational modification of proteins containing the conserved sequence motif Asn-X-Ser/Thr. The attachment of oligosaccharides is implicated in diverse processes such as protein folding and quality control, ...
Asparagine-linked glycosylation is a post-translational modification of proteins containing the conserved sequence motif Asn-X-Ser/Thr. The attachment of oligosaccharides is implicated in diverse processes such as protein folding and quality control, organism development or host-pathogen interactions. The reaction is catalysed by oligosaccharyltransferase (OST), a membrane protein complex located in the endoplasmic reticulum. The central, catalytic enzyme of OST is the STT3 subunit, which has homologues in bacteria and archaea. Structural analysis of a bacterial OST, undecaprenyl-diphosphooligosaccharide protein glycotransferase EC:2.4.99.19 (PglB) protein, revealed two domains: a transmembrane domain and a periplasmic domain. This entry represents the C-terminal periplasmic beta-barrel domain [1].
