Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 42.91 kDa 
• Atom Count: 2672 
• Residue Count: 337 
• Unique protein chains: 2

2O8V

PAPS reductase in a covalent complex with thioredoxin C35A

• DOI: 10.2210/pdb2O8V/pdb

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


• Deposited: 2006-12-12 Released: 2007-03-27 
• Deposition Author(s): Chartron, J., Shiau, C., Stout, C.D., Carroll, K.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.307 
• R-Value Work: 0.297 
• R-Value Observed: 0.298 

Literature

3'-Phosphoadenosine-5'-phosphosulfate Reductase in Complex with Thioredoxin: A Structural Snapshot in the Catalytic Cycle.

Chartron, J., Shiau, C., Stout, C.D., Carroll, K.S.

(2007) Biochemistry 46: 3942-3951

• PubMed: 17352498 
• DOI: 10.1021/bi700130e
• Primary Citation of Related Structures:  
  2O8V


• PubMed Abstract: 
  

The crystal structure of Escherichia coli 3'-phosphoadenosine-5'-phosphosulfate (PAPS) reductase in complex with E. coli thioredoxin 1 (Trx1) has been determined to 3.0 A resolution. The two proteins are covalently linked via a mixed disulfide that forms during nucleophilic attack of Trx's N-terminal cysteine on the Sgamma atom of the PAPS reductase S-sulfocysteine (E-Cys-Sgamma-SO3-), a central intermediate in the catalytic cycle. For the first time in a crystal structure, residues 235-244 in the PAPS reductase C-terminus are observed, depicting an array of interprotein salt bridges between Trx and the strictly conserved glutathione-like sequence, Glu238Cys239Gly240Leu241His242. The structure also reveals a Trx-binding surface adjacent to the active site cleft and regions of PAPS reductase associated with conformational change. Interaction at this site strategically positions Trx to bind the S-sulfated C-terminus and addresses the mechanism for requisite structural rearrangement of this domain. An apparent sulfite-binding pocket at the protein-protein interface explicitly orients the S-sulfocysteine Sgamma atom for nucleophilic attack in a subsequent step. Taken together, the structure of PAPS reductase in complex with Trx highlights the large structural rearrangement required to accomplish sulfonucleotide reduction and suggests a role for Trx in catalysis beyond the paradigm of disulfide reduction.

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Organizational Affiliation: 

Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Phosphoadenosine phosphosulfate reductase	A	252	Escherichia coli	Mutation(s): 0  Gene Names: cysH EC: 1.8.4.8
Find proteins for P17854 (Escherichia coli (strain K12)) Explore P17854  Go to UniProtKB:  P17854

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Thioredoxin 1	B	128	Escherichia coli	Mutation(s): 1  Gene Names: trxA EC: 1
Find proteins for P0AA25 (Escherichia coli (strain K12)) Explore P0AA25  Go to UniProtKB:  P0AA25

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.307 
• R-Value Work: 0.297 
• R-Value Observed: 0.298 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 40.932	α = 90
b = 111.153	β = 90
c = 153.434	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
CNS	refinement
PDB_EXTRACT	data extraction
Blu-Ice	data collection
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-12-12 
• Released Date: 2007-03-27 
Deposition Author(s): Chartron, J., Shiau, C., Stout, C.D., Carroll, K.S.

Revision History 

• Version 1.0: 2007-03-27
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-11
  Changes: Data collection