2ZAG
Crystal structure of the SeMet-substituted soluble domain of STT3 from P. furiosus
Summary for 2ZAG
| Entry DOI | 10.2210/pdb2zag/pdb |
| Related | 2ZAI |
| Descriptor | Oligosaccharyl transferase stt3 subunit related protein, CALCIUM ION, CHLORIDE ION (3 entities in total) |
| Functional Keywords | multi-domain proteins (alpha and beta), transferase |
| Biological source | Pyrococcus furiosus |
| Total number of polymer chains | 4 |
| Total formula weight | 225144.48 |
| Authors | Maita, N. (deposition date: 2007-10-05, release date: 2007-12-11, Last modification date: 2024-10-16) |
| Primary citation | Igura, M.,Maita, N.,Kamishikiryo, J.,Yamada, M.,Obita, T.,Maenaka, K.,Kohda, D. Structure-guided identification of a new catalytic motif of oligosaccharyltransferase Embo J., 27:234-243, 2008 Cited by PubMed Abstract: Asn-glycosylation is widespread not only in eukaryotes but also in archaea and some eubacteria. Oligosaccharyltransferase (OST) catalyzes the co-translational transfer of an oligosaccharide from a lipid donor to an asparagine residue in nascent polypeptide chains. Here, we report that a thermophilic archaeon, Pyrococcus furiosus OST is composed of the STT3 protein alone, and catalyzes the transfer of a heptasaccharide, containing one hexouronate and two pentose residues, onto peptides in an Asn-X-Thr/Ser-motif-dependent manner. We also determined the 2.7-A resolution crystal structure of the C-terminal soluble domain of Pyrococcus STT3. The structure-based multiple sequence alignment revealed a new motif, DxxK, which is adjacent to the well-conserved WWDYG motif in the tertiary structure. The mutagenesis of the DK motif residues in yeast STT3 revealed the essential role of the motif in the catalytic activity. The function of this motif may be related to the binding of the pyrophosphate group of lipid-linked oligosaccharide donors through a transiently bound cation. Our structure provides the first structural insights into the formation of the oligosaccharide-asparagine bond. PubMed: 18046457DOI: 10.1038/sj.emboj.7601940 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (3 Å) |
Structure validation
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