4B6R

Structure of Helicobacter pylori Type II Dehydroquinase inhibited by (2S)-2-(4-methoxy)benzyl-3-dehydroquinic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Mechanistic basis of the inhibition of type II dehydroquinase by (2S)- and (2R)-2-benzyl-3-dehydroquinic acids.

Lence, E.Tizon, L.Otero, J.M.Peon, A.Prazeres, V.F.Llamas-Saiz, A.L.Fox, G.C.van Raaij, M.J.Lamb, H.Hawkins, A.R.Gonzalez-Bello, C.

(2013) ACS Chem Biol 8: 568-577

  • DOI: 10.1021/cb300493s
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The structural changes caused by the substitution of the aromatic moiety in (2S)-2-benzyl-3-dehydroquinic acids and its epimers in C2 by electron-withdrawing or electron-donating groups in type II dehydroquinase enzyme from M. tuberculosis and H. pyl ...

    The structural changes caused by the substitution of the aromatic moiety in (2S)-2-benzyl-3-dehydroquinic acids and its epimers in C2 by electron-withdrawing or electron-donating groups in type II dehydroquinase enzyme from M. tuberculosis and H. pylori has been investigated by structural and computational studies. Both compounds are reversible competitive inhibitors of this enzyme, which is essential in these pathogenic bacteria. The crystal structures of M. tuberculosis and H. pylori in complex with (2S)-2-(4-methoxy)benzyl- and (2S)-2-perfluorobenzyl-3-dehydroquinic acids have been solved at 2.0, 2.3, 2.0, and 1.9 Å, respectively. The crystal structure of M. tuberculosis in complex with (2R)-2-(benzothiophen-5-yl)methyl-3-dehydroquinic acid is also reported at 1.55 Å. These crystal structures reveal key differences in the conformation of the flexible loop of the two enzymes, a difference that depends on the presence of electron-withdrawing or electron-donating groups in the aromatic moiety of the inhibitors. This loop closes over the active site after substrate binding, and its flexibility is essential for the function of the enzyme. These differences have also been investigated by molecular dynamics simulations in an effort to understand the significant inhibition potency differences observed between some of these compounds and also to obtain more information about the possible movements of the loop. These computational studies have also allowed us to identify key structural factors of the H. pylori loop that could explain its reduced flexibility in comparison to the M. tuberculosis loop, specifically by the formation of a key salt bridge between the side chains of residues Asp18 and Arg20.


    Organizational Affiliation

    Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Edificio CACTUS, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-DEHYDROQUINATE DEHYDRATASE
A, B, C
167Helicobacter pylori 26695Mutation(s): 0 
Gene Names: aroQHP_1038
EC: 4.2.1.10
Find proteins for Q48255 (Helicobacter pylori (strain ATCC 700392 / 26695))
Go to UniProtKB:  Q48255
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3DQ
Query on 3DQ

Download CCD File 
A, B, C
(1R,2S,4S,5R)-2-(4-methoxyphenyl)methyl-1,4,5-trihydroxy-3-oxocyclohexane-1-carboxylic acid
C15 H18 O7
KDOXKRDIRCHNDT-UQFNBPPOSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
9ZTKi:  1420   nM  Binding MOAD
9ZTKi:  1420   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.215 
  • Space Group: P 42 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.436α = 90
b = 100.436β = 90
c = 104.3γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-12-19
    Type: Initial release
  • Version 1.1: 2013-03-20
    Changes: Other, Structure summary
  • Version 1.2: 2013-03-27
    Changes: Database references
  • Version 1.3: 2013-08-07
    Changes: Non-polymer description
  • Version 1.4: 2014-09-17
    Changes: Atomic model, Derived calculations, Non-polymer description
  • Version 1.5: 2018-01-17
    Changes: Database references