2IOB

E. coli Bifunctional glutathionylspermidine synthetase/amidase Apo protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Dual binding sites for translocation catalysis by Escherichia coli glutathionylspermidine synthetase

Pai, C.H.Chiang, B.Y.Ko, T.P.Chou, C.C.Chong, C.M.Yen, F.J.Chen, S.Coward, J.K.Wang, A.H.-J.Lin, C.H.

(2006) Embo J. 25: 5970-5982

  • DOI: 10.1038/sj.emboj.7601440
  • Primary Citation of Related Structures:  2IO7, 2IO8, 2IO9, 2IOA
  • Also Cited By: 3O98

  • PubMed Abstract: 
  • Most organisms use glutathione to regulate intracellular thiol redox balance and protect against oxidative stress; protozoa, however, utilize trypanothione for this purpose. Trypanothione biosynthesis requires ATP-dependent conjugation of glutathione ...

    Most organisms use glutathione to regulate intracellular thiol redox balance and protect against oxidative stress; protozoa, however, utilize trypanothione for this purpose. Trypanothione biosynthesis requires ATP-dependent conjugation of glutathione (GSH) to the two terminal amino groups of spermidine by glutathionylspermidine synthetase (GspS) and trypanothione synthetase (TryS), which are considered as drug targets. GspS catalyzes the penultimate step of the biosynthesis-amide bond formation between spermidine and the glycine carboxylate of GSH. We report herein five crystal structures of Escherichia coli GspS in complex with substrate, product or inhibitor. The C-terminal of GspS belongs to the ATP-grasp superfamily with a similar fold to the human glutathione synthetase. GSH is likely phosphorylated at one of two GSH-binding sites to form an acylphosphate intermediate that then translocates to the other site for subsequent nucleophilic addition of spermidine. We also identify essential amino acids involved in the catalysis. Our results constitute the first structural information on the biochemical features of parasite homologs (including TryS) that underlie their broad specificity for polyamines.


    Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica, No. 128 Academia Road Section 2, Nan-Kang, Taipei 11529, Taiwan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bifunctional glutathionylspermidine synthetase/amidase
A, B
619Escherichia coli (strain K12)Gene Names: gss (gsp)
EC: 3.5.1.78, 6.3.1.8
Find proteins for P0AES0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AES0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.175 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 149.267α = 90.00
b = 92.964β = 109.37
c = 108.296γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
XTALVIEWrefinement
HKL-2000data reduction
SOLVEphasing
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-12
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance