Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 30.58 kDa 
• Atom Count: 2,178 
• Modelled Residue Count: 251 
• Deposited Residue Count: 261 
• Unique protein chains: 1

 3LLI

Sulfhydryl Oxidase Fragment of Human QSOX1

• PDB DOI: 10.2210/pdb3LLI/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-01-29 Released: 2010-03-23 
• Deposition Author(s): Alon, A., Fass, D.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.325 
• R-Value Work: 0.275 

Literature

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

• PubMed: 20211621 
• DOI: 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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sulfhydryl oxidase 1	A	261	Homo sapiens	Mutation(s): 0  Gene Names: QSCN6, QSOX1, UNQ2520/PRO6013 EC: 1.8.3.2
UniProt & NIH Common Fund Data Resources
Find proteins for O00391 (Homo sapiens) Explore O00391  Go to UniProtKB:  O00391
PHAROS:  O00391

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	B [auth A]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.325 
• R-Value Work: 0.275 
• Space Group: P 6₄ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.606	α = 90
b = 85.606	β = 90
c = 125.706	γ = 120

Software Package:

Software Name	Purpose
SOLVE	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-03-23 
Deposition Author(s): Alon, A., Fass, D.

Revision History  

• Version 1.0: 2010-03-23
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance