2O8V

PAPS reductase in a covalent complex with thioredoxin C35A

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.297 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history. 

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

  • DOI: 10.1021/bi700130e

  • 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 f ...

    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.

    Organizational Affiliation: 

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phosphoadenosine phosphosulfate reductase
A
252Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cysH
EC: 1.8.4.8
Find proteins for P17854 (Escherichia coli (strain K12))
Go to UniProtKB:  P17854
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Thioredoxin 1
B
128Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: trxA (fipA, tsnC)
Find proteins for P0AA25 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AA25
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.297 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 40.932α = 90.00
b = 111.153β = 90.00
c = 153.434γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
CNSrefinement
MOLREPphasing
PDB_EXTRACTdata extraction
MOSFLMdata reduction
Blu-Icedata collection
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

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