3G9B

Crystal structure of reduced Ost6L


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 

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This is version 1.1 of the entry. See complete history


Literature

Oxidoreductase activity of oligosaccharyltransferase subunits Ost3p and Ost6p defines site-specific glycosylation efficiency.

Schulz, B.L.Stirnimann, C.U.Grimshaw, J.P.Brozzo, M.S.Fritsch, F.Mohorko, E.Capitani, G.Glockshuber, R.Grutter, M.G.Aebi, M.

(2009) Proc Natl Acad Sci U S A 106: 11061-11066

  • DOI: 10.1073/pnas.0812515106
  • Primary Citation of Related Structures:  
    3G7Y, 3G9B, 3GA4

  • PubMed Abstract: 
  • Asparagine-linked glycosylation is a common posttranslational modification of diverse secretory and membrane proteins in eukaryotes, where it is catalyzed by the multiprotein complex oligosaccharyltransferase. The functions of the protein subunits of oligoasccharyltransferase, apart from the catalytic Stt3p, are ill defined ...

    Asparagine-linked glycosylation is a common posttranslational modification of diverse secretory and membrane proteins in eukaryotes, where it is catalyzed by the multiprotein complex oligosaccharyltransferase. The functions of the protein subunits of oligoasccharyltransferase, apart from the catalytic Stt3p, are ill defined. Here we describe functional and structural investigations of the Ost3/6p components of the yeast enzyme. Genetic, biochemical and structural analyses of the lumenal domain of Ost6p revealed oxidoreductase activity mediated by a thioredoxin-like fold with a distinctive active-site loop that changed conformation with redox state. We found that mutation of the active-site cysteine residues of Ost6p and its paralogue Ost3p affected the glycosylation efficiency of a subset of glycosylation sites. Our results show that eukaryotic oligosaccharyltransferase is a multifunctional enzyme that acts at the crossroads of protein modification and protein folding.


    Organizational Affiliation

    Institute of Microbiology, Department of Biology, Eidgenössische Technische Hochschule Zurich, 8093 Zurich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Dolichyl-diphosphooligosaccharide-protein glycosyltransferase subunit OST6A178Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: OST6YML019W
EC: 2.4.1.119
UniProt
Find proteins for Q03723 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q03723 
Go to UniProtKB:  Q03723
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03723
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.506α = 90
b = 59.456β = 90
c = 103.559γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
SHELXEmodel building
autoSHARPphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-06-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance