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



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