Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 85.29 kDa 
• Atom Count: 6148 
• Residue Count: 749 
• Unique protein chains: 1

1U3A

mutant DsbA

• DOI: 10.2210/pdb1U3A/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2004-07-21 Released: 2005-05-03 
• Deposition Author(s): Serre, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.272 
• R-Value Work: 0.209 
• R-Value Observed: 0.216 

Literature

Intriguing conformation changes associated with the trans/cis isomerization of a prolyl residue in the active site of the DsbA C33A mutant

Ondo-Mbele, E., Vives, C., Kone, A., Serre, L.

(2005) J Mol Biol 347: 555-563

• PubMed: 15755450 
• DOI: 10.1016/j.jmb.2005.01.049
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Escherichia coli DsbA belongs to the thioredoxin family and catalyzes the formation of disulfide bonds during the folding of proteins in the bacterial periplasm. It active site (C30-P31-H32-C33) consists of a disulfide bridge that is transferred to newly translocated proteins. The work reported here refers to the DsbA mutant termed C33A that retains, towards reduced unfolded thrombin inhibitor, an activity comparable with the wild-type enzyme. Besides, C33A is also able to form a stable covalent complex with DsbB, the membrane protein responsible for maintaining DsbA in its active form. We have determined the crystal structure of C33A at 2.0 angstroms resolution. Although the general architecture of wt DsbA is conserved, we observe the trans/cis isomerization of P31 in the active site and further conformational changes in the so-called "peptide binding groove" region. Interestingly, these modifications involve residues that are specific to DsbA but not to the thioredoxin family fold. The C33A crystal structure exhibits as well a hydrophobic ligand bound close to the active site of the enzyme. The structural analysis of C33A may actually explain the peculiar behavior of this mutant in regards with its interaction with DsbB and thus provides new insights for understanding the catalytic cycle of DsbA.

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Organizational Affiliation: 

Laboratoire des Protéines Membranaires, Institut de Biologie Structurale Jean-Pierre Ebel CEA/CNRS/UJF. 41, rue Jules Horowitz, 38027 Grenoble cedex 01, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Thiol: disulfide interchange protein dsbA	A, B, D, E	189	Escherichia coli	Mutation(s): 1  Gene Names: dsbA, ppfA
Find proteins for P0AEG4 (Escherichia coli (strain K12)) Explore P0AEG4  Go to UniProtKB:  P0AEG4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PE5	B, D	3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL C18 H38 O9 CUDPPTPIUWYGFI-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.272 
• R-Value Work: 0.209 
• R-Value Observed: 0.216 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.956	α = 90
b = 82.282	β = 98.74
c = 113.91	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
CCP4	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-21 
• Released Date: 2005-05-03 
Deposition Author(s): Serre, L.

Revision History 

• Version 1.0: 2005-05-03
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance