4ROL

Deoxyhemoglobin in complex with imidazolylacryloyl derivatives

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Identification of a novel class of covalent modifiers of hemoglobin as potential antisickling agents.

Omar, A.M., Mahran, M.A., Ghatge, M.S., Chowdhury, N., Bamane, F.H., El-Araby, M.E., Abdulmalik, O., Safo, M.K.

(2015) Org.Biomol.Chem. 13: 6353-6370

  • DOI: 10.1039/c5ob00367a
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Aromatic aldehydes and ethacrynic acid (ECA) exhibit antipolymerization properties that are beneficial for sickle cell disease therapy. Based on the ECA pharmacophore and its atomic interaction with hemoglobin, we designed and synthesized several com ...

    Aromatic aldehydes and ethacrynic acid (ECA) exhibit antipolymerization properties that are beneficial for sickle cell disease therapy. Based on the ECA pharmacophore and its atomic interaction with hemoglobin, we designed and synthesized several compounds - designated as KAUS (imidazolylacryloyl derivatives) - that we hypothesized would bind covalently to βCys93 of hemoglobin and inhibit sickling. The compounds surprisingly showed weak allosteric and antisickling properties. X-ray studies of hemoglobin in complex with representative KAUS compounds revealed an unanticipated mode of Michael addition between the β-unsaturated carbon and the N-terminal αVal1 nitrogen at the α-cleft of hemoglobin, with no observable interaction with βCys93. Interestingly, the compounds exhibited almost no reactivity with the free amino acids, L-Val, L-His and L-Lys, but showed some reactivity with both glutathione and L-Cys. Our findings provide a molecular level explanation for the compounds biological activities and an important framework for targeted modifications that would yield novel potent antisickling agents.

    Organizational Affiliation: 

    Department of Pharmaceutical Chemistry, Faculty of Pharmacy, King Abdulaziz University, Alsulaymanyah, Jeddah 21589, Saudi Arabia. asmansour@kau.edu.sa.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit alpha
A, C
141Homo sapiensGene Names: HBA1, HBA2
Find proteins for P69905 (Homo sapiens)
Go to Gene View: HBA1 HBA2
Go to UniProtKB:  P69905
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit beta
B, D
146Homo sapiensGene Names: HBB
Find proteins for P68871 (Homo sapiens)
Go to Gene View: HBB
Go to UniProtKB:  P68871
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3U7
Query on 3U7
Download SDF File 
Download CCD File 
A, C
4-{2,3-dichloro-4-[3-(1H-imidazol-2-yl)propanoyl]phenoxy}butanoic acid
C16 H16 Cl2 N2 O4
LHJXZHKKMFVTIF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4
Download SDF File 
Download CCD File 
B, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
HEM
Query on HEM
Download SDF File 
Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.182 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.645α = 90.00
b = 76.570β = 98.02
c = 53.198γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
d*TREKdata reduction
d*TREKdata scaling
CNSphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-05-20
    Type: Initial release
  • Version 1.1: 2015-06-10
    Type: Database references