Crystal structure of the SeMet-substituted soluble domain of STT3 from P. furiosus

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.220 

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Structure-guided identification of a new catalytic motif of oligosaccharyltransferase

Igura, M.Maita, N.Kamishikiryo, J.Yamada, M.Obita, T.Maenaka, K.Kohda, D.

(2008) EMBO J 27: 234-243

  • DOI: https://doi.org/10.1038/sj.emboj.7601940
  • Primary Citation of Related Structures:  
    2ZAG, 2ZAI

  • 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.

  • Organizational Affiliation

    Division of Structural Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Oligosaccharyl transferase stt3 subunit related protein
A, B, C, D
497Pyrococcus furiosus DSM 3638Mutation(s): 0 
Gene Names: PF0156
Find proteins for Q8U4D2 (Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1))
Explore Q8U4D2 
Go to UniProtKB:  Q8U4D2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8U4D2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.402α = 90
b = 266.397β = 90
c = 73.982γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 2007-12-11 
  • Deposition Author(s): Maita, N.

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance