2FN0

Crystal structure of Yersinia enterocolitica salicylate synthase (Irp9)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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


Literature

Crystal Structures of Yersinia enterocolitica Salicylate Synthase and its Complex with the Reaction Products Salicylate and Pyruvate.

Kerbarh, O., Chirgadze, D.Y., Blundell, T.L., Abell, C.

(2006) J Mol Biol 357: 524-534

  • DOI: 10.1016/j.jmb.2005.12.078
  • Primary Citation of Related Structures:  
    2FN1, 2FN0

  • PubMed Abstract: 

    • The salicylate synthase, Irp9, from Yersinia enterocolitica is involved in the biosynthesis of the siderophore yersiniabactin. It is a bifunctional enzyme that forms salicylate and pyruvate from chorismate and water via the intermediate isochorismate. Here we report the first crystal structure of Irp9 and also of its complex with the reaction products salicylate and pyruvate at 1 ...

    The salicylate synthase, Irp9, from Yersinia enterocolitica is involved in the biosynthesis of the siderophore yersiniabactin. It is a bifunctional enzyme that forms salicylate and pyruvate from chorismate and water via the intermediate isochorismate. Here we report the first crystal structure of Irp9 and also of its complex with the reaction products salicylate and pyruvate at 1.85 A and 2.1 A resolution, respectively. Like other members of the chorismate-utilizing enzyme family, e.g. the TrpE subunit of anthranilate synthase and the PabB subunit of 4-amino-4-deoxychorismate synthase, Irp9 has a complex alpha/beta fold. The crystal structure of Irp9 contains one molecule each of phosphate and acetate derived from the crystallization buffer. The Irp9-products complex structure was obtained by soaking chorismate into Irp9, demonstrating that the enzyme is still catalytically active in the crystal. Both structures contain Mg(2+) in the active site. There is no evidence of the allosteric tryptophan binding site found in TrpE and PabB. Mutagenesis of Glu240, His321 and Tyr372 provided some insight into the mechanism of the two transformations catalyzed by Irp9. Knowledge of the structure of Irp9 will guide the search for potent inhibitors of salicylate formation, and hence of bacterial iron uptake, which is directly related to the virulence of Yersinia.

    Organizational Affiliation: 

    Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
salicylate synthetase, Irp9A, B437Yersinia enterocoliticaMutation(s): 0 
Gene Names: irp9
Find proteins for Q9X9I8 (Yersinia enterocolitica)
Explore Q9X9I8 
Go to UniProtKB:  Q9X9I8
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.74α = 90
b = 145.671β = 107.97
c = 58.807γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
X-GENdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-02-14
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description