4B6S

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 

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Ligand Structure Quality Assessment 


This is version 1.4 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
  • Primary Citation of Related Structures:  
    4B6O, 4B6P, 4B6Q, 4B6R, 4B6S

  • 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. pylori has been investigated by structural and computational studies ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
3-DEHYDROQUINATE DEHYDRATASEA, B, C167Helicobacter pylori 26695Mutation(s): 0 
Gene Names: aroQHP_1038
EC: 4.2.1.10
UniProt
Find proteins for Q48255 (Helicobacter pylori (strain ATCC 700392 / 26695))
Explore Q48255 
Go to UniProtKB:  Q48255
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2HN (Subject of Investigation/LOI)
Query on 2HN

Download Ideal Coordinates CCD File 
D [auth A], F [auth B], G [auth C](1R,2S,4S,5R)-2-(2,3,4,5,6-pentafluorophenyl)methyl-1,4,5-trihydroxy-3-oxocyclohexane-1-carboxylic acid
C14 H11 F5 O6
ZNZHQTVBMHBUCF-GLOYCNQYSA-N
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
E [auth A]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
2HN Binding MOAD:  4B6S Ki: 970 (nM) from 1 assay(s)
PDBBind:  4B6S Ki: 970 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 
  • Space Group: P 42 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.19α = 90
b = 100.19β = 90
c = 104.58γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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: 2018-01-17
    Changes: Database references