Sulfhydryl Oxidase Fragment of Human QSOX1

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.237 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


QSOX contains a pseudo-dimer of functional and degenerate sulfhydryl oxidase domains.

Alon, A.Heckler, E.J.Thorpe, C.Fass, D.

(2010) FEBS Lett 584: 1521-1525

  • DOI: https://doi.org/10.1016/j.febslet.2010.03.001
  • Primary Citation of Related Structures:  
    3LLI, 3LLK

  • PubMed Abstract: 

    Quiescin sulfhydryl oxidase (QSOX) catalyzes formation of disulfide bonds between cysteine residues in substrate proteins. Human QSOX1 is a multi-domain, monomeric enzyme containing a module related to the single-domain sulfhydryl oxidases of the Erv family. A partial QSOX1 crystal structure reveals a single-chain pseudo-dimer mimicking the quaternary structure of Erv enzymes. However, one pseudo-dimer "subunit" has lost its cofactor and catalytic activity. In QSOX evolution, a further concatenation to a member of the protein disulfide isomerase family resulted in an enzyme capable of both disulfide formation and efficient transfer to substrate proteins.

  • Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sulfhydryl oxidase 1
A, B, C
261Homo sapiensMutation(s): 0 
Gene Names: QSCN6QSOX1UNQ2520/PRO6013
UniProt & NIH Common Fund Data Resources
Find proteins for O00391 (Homo sapiens)
Explore O00391 
Go to UniProtKB:  O00391
PHAROS:  O00391
GTEx:  ENSG00000116260 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00391
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.237 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.481α = 90
b = 161.573β = 90
c = 121.94γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description