2PEV

Complex of Aldose Reductase with NADP+ and simaltaneously bound competetive inhibitors Fidarestat and IDD594. Concentration of Fidarestat in soaking solution exceeds concentration of IDD594.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.101 
  • R-Value Work: 0.088 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal packing modifies ligand binding affinity: The case of aldose reductase.

Cousido-Siah, A.Petrova, T.Hazemann, I.Mitschler, A.Ruiz, F.X.Howard, E.Ginell, S.Atmanene, C.Van Dorsselaer, A.Sanglier-Cianferani, S.Joachimiak, A.Podjarny, A.

(2012) Proteins 80: 2552-2561

  • DOI: 10.1002/prot.24136
  • Primary Citation of Related Structures:  2PF8, 2PFH

  • PubMed Abstract: 
  • The relationship between the structures of protein-ligand complexes existing in the crystal and in solution, essential in the case of fragment-based screening by X-ray crystallography (FBS-X), has been often an object of controversy. To address this ...

    The relationship between the structures of protein-ligand complexes existing in the crystal and in solution, essential in the case of fragment-based screening by X-ray crystallography (FBS-X), has been often an object of controversy. To address this question, simultaneous co-crystallization and soaking of two inhibitors with different ratios, Fidarestat (FID; K(d) = 6.5 nM) and IDD594 (594; K(d) = 61 nM), which bind to h-aldose reductase (AR), have been performed. The subatomic resolution of the crystal structures allows the differentiation of both inhibitors, even when the structures are almost superposed. We have determined the occupation ratio in solution by mass spectrometry (MS) Occ(FID)/Occ(594) = 2.7 and by X-ray crystallography Occ(FID)/Occ(594) = 0.6. The occupancies in the crystal and in solution differ 4.6 times, implying that ligand binding potency is influenced by crystal contacts. A structural analysis shows that the Loop A (residues 122-130), which is exposed to the solvent, is flexible in solution, and is involved in packing contacts within the crystal. Furthermore, inhibitor 594 contacts the base of Loop A, stabilizing it, while inhibitor FID does not. This is shown by the difference in B-factors of the Loop A between the AR-594 and AR-FID complexes. A stable loop diminishes the entropic energy barrier to binding, favoring 594 versus FID. Therefore, the effect of the crystal environment should be taken into consideration in the X-ray diffraction analysis of ligand binding to proteins. This conclusion highlights the need for additional methodologies in the case of FBS-X to validate this powerful screening technique, which is widely used.


    Organizational Affiliation

    Department of Integrative Biology, IGBMC, CNRS, INSERM, Université de Strasbourg, Illkirch, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aldose reductase
A
316Homo sapiensGene Names: AKR1B1 (ALDR1)
EC: 1.1.1.21
Find proteins for P15121 (Homo sapiens)
Go to Gene View: AKR1B1
Go to UniProtKB:  P15121
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

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A
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
LDT
Query on LDT

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Download CCD File 
A
IDD594
[2-(4-BROMO-2-FLUORO-BENZYLTHIOCARBAMOYL)-5-FLUORO-PHENOXY]-ACETIC ACID
C16 H12 Br F2 N O3 S
JCZUIWYXULSXSW-UHFFFAOYSA-N
 Ligand Interaction
FID
Query on FID

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Download CCD File 
A
(2S,4S)-2-AMINOFORMYL-6-FLUORO-SPIRO[CHROMAN-4,4'-IMIDAZOLIDINE]-2',5'-DIONE
FIDARESTAT
C12 H10 F N3 O4
WAAPEIZFCHNLKK-UFBFGSQYSA-N
 Ligand Interaction
NDP
Query on NDP

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A
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.9 Å
  • R-Value Free: 0.101 
  • R-Value Work: 0.088 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.247α = 90.00
b = 66.667β = 92.27
c = 47.226γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SHELXL-97refinement
HKL-2000data collection
AMoREphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-04-17
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2012-07-25
    Type: Database references
  • Version 1.4: 2012-10-17
    Type: Database references