Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 31.95 kDa 
• Atom Count: 2206 
• Residue Count: 273 
• Unique protein chains: 1

2H1D

ResA pH 9.25

• DOI: 10.2210/pdb2H1D/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Bacillus subtilis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-05-16 Released: 2006-09-19 
• Deposition Author(s): Lewin, A., Crow, A., Oubrie, A., Le Brun, N.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.275 
• R-Value Work: 0.195 
• R-Value Observed: 0.231 

Literature

Molecular Basis for Specificity of the Extracytoplasmic Thioredoxin ResA.

Lewin, A., Crow, A., Oubrie, A., Le Brun, N.E.

(2006) J Biol Chem 281: 35467-35477

• PubMed: 16971393 
• DOI: 10.1074/jbc.M607047200
• Primary Citation of Related Structures:  
  2H19, 2H1B, 2H1A, 2H1G, 2H1D


• PubMed Abstract: 
  

ResA, an extracytoplasmic thioredoxin from Bacillus subtilis, acts in cytochrome c maturation by reducing the disulfide bond present in apocytochromes prior to covalent attachment of heme. This reaction is (and has to be) specific, as broad substrate specificity would result in unproductive shortcircuiting with the general oxidizing thioredoxin(s) present in the same compartment. Using mutational analysis and subsequent biochemical and structural characterization of active site variants, we show that reduced ResA displays unusually low reactivity at neutral pH, consistent with the observed high pKa values>8 for both active site cysteines. Residue Glu80 is shown to play a key role in controlling the acid-base properties of the active site. A model in which substrate binding dramatically enhances the reactivity of the active site cysteines is proposed to account for the specificity of the protein. Such a substratemediated activation mechanism is likely to have wide relevance for extracytoplasmic thioredoxins.

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Organizational Affiliation: 

School of Chemical Sciences and Pharmacy, Centre for Metalloprotein Spectroscopy and Biology, University of East Anglia, Norwich NR4 7TJ, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Thiol-disulfide oxidoreductase resA	A, B	143	Bacillus subtilis	Mutation(s): 0  Gene Names: resA
Find proteins for P35160 (Bacillus subtilis (strain 168)) Explore P35160  Go to UniProtKB:  P35160

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EDO	A	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.275 
• R-Value Work: 0.195 
• R-Value Observed: 0.231 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.289	α = 90
b = 59.791	β = 90
c = 110.1	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ProDC	data collection
MOSFLM	data reduction
CCP4	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-05-16 
• Released Date: 2006-09-19 
Deposition Author(s): Lewin, A., Crow, A., Oubrie, A., Le Brun, N.E.

Revision History 

• Version 1.0: 2006-09-19
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-18
  Changes: Refinement description