2GOY

Crystal structure of assimilatory adenosine 5'-phosphosulfate reductase with bound APS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

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This is version 1.2 of the entry. See complete history. 


Literature

Substrate Recognition, Protein Dynamics, and Iron-Sulfur Cluster in Pseudomonas aeruginosa Adenosine 5'-Phosphosulfate Reductase.

Chartron, J., Carroll, K.S., Shiau, C., Gao, H., Leary, J.A., Bertozzi, C.R., Stout, C.D.

(2006) J Mol Biol 364: 152-169

  • DOI: 10.1016/j.jmb.2006.08.080
  • Primary Citation of Related Structures:  
    2GOY

  • PubMed Abstract: 

    • APS reductase catalyzes the first committed step of reductive sulfate assimilation in pathogenic bacteria, including Mycobacterium tuberculosis, and is a promising target for drug development. We report the 2.7 A resolution crystal structure of Pseudomonas aeruginosa APS reductase in the thiosulfonate intermediate form of the catalytic cycle and with substrate bound ...

    APS reductase catalyzes the first committed step of reductive sulfate assimilation in pathogenic bacteria, including Mycobacterium tuberculosis, and is a promising target for drug development. We report the 2.7 A resolution crystal structure of Pseudomonas aeruginosa APS reductase in the thiosulfonate intermediate form of the catalytic cycle and with substrate bound. The structure, high-resolution Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry, and quantitative kinetic analysis, establish that the two chemically discrete steps of the overall reaction take place at distinct sites on the enzyme, mediated via conformational flexibility of the C-terminal 18 residues. The results address the mechanism by which sulfonucleotide reductases protect the covalent but labile enzyme-intermediate before release of sulfite by the protein cofactor thioredoxin. P. aeruginosa APS reductase contains an [4Fe-4S] cluster that is essential for catalysis. The structure reveals an unusual mode of cluster coordination by tandem cysteine residues and suggests how this arrangement might facilitate conformational change and cluster interaction with the substrate. Assimilatory 3'-phosphoadenosine 5'-phosphosulfate (PAPS) reductases are evolutionarily related, homologous enzymes that catalyze the same overall reaction, but do so in the absence of an [Fe-S] cluster. The APS reductase structure reveals adaptive use of a phosphate-binding loop for recognition of the APS O3' hydroxyl group, or the PAPS 3'-phosphate group.

    Organizational Affiliation: 

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



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
adenosine phosphosulfate reductaseA, B, C, D, E, F, G, H275Pseudomonas aeruginosaMutation(s): 0 
Gene Names: cysH
EC: 1.8.4.10 (PDB Primary Data), 1.8.4.8 (UniProt)
Find proteins for O05927 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore O05927 
Go to UniProtKB:  O05927
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.027α = 90.1
b = 102.788β = 102.57
c = 139.374γ = 89.95
Software Package:
Software NamePurpose
SCALAdata scaling
CNSphasing
CNSrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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