The crystal structure of Glycogen Phosphorylase in complex with 10d

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.136 

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A multidisciplinary study of 3-( beta-d-glucopyranosyl)-5-substituted-1,2,4-triazole derivatives as glycogen phosphorylase inhibitors: Computation, synthesis, crystallography and kinetics reveal new potent inhibitors.

Kun, S.Begum, J.Kyriakis, E.Stamati, E.C.V.Barkas, T.A.Szennyes, E.Bokor, E.Szabo, K.E.Stravodimos, G.A.Sipos, A.Docsa, T.Gergely, P.Moffatt, C.Patraskaki, M.S.Kokolaki, M.C.Gkerdi, A.Skamnaki, V.T.Leonidas, D.D.Somsak, L.Hayes, J.M.

(2018) Eur J Med Chem 147: 266-278

  • DOI: https://doi.org/10.1016/j.ejmech.2018.01.095
  • Primary Citation of Related Structures:  
    6F3J, 6F3L, 6F3R, 6F3S, 6F3U

  • PubMed Abstract: 

    3-(β-d-Glucopyranosyl)-5-substituted-1,2,4-triazoles have been revealed as an effective scaffold for the development of potent glycogen phosphorylase (GP) inhibitors but with the potency very sensitive to the nature of the alkyl/aryl 5-substituent (Kun et al., Eur. J. Med. Chem. 2014, 76, 567). For a training set of these ligands, quantum mechanics-polarized ligand docking (QM-PLD) demonstrated good potential to identify larger differences in potencies (predictive index PI = 0.82) and potent inhibitors with K i 's < 10 μM (AU-ROC = 0.86). Accordingly, in silico screening of 2335 new analogues exploiting the ZINC docking database was performed and nine predicted candidates selected for synthesis. The compounds were prepared in O-perbenzoylated forms by either ring transformation of 5-β-d-glucopyranosyl tetrazole by N-benzyl-arenecarboximidoyl chlorides, ring closure of C-(β-d-glucopyranosyl)formamidrazone with aroyl chlorides, or that of N-(β-d-glucopyranosylcarbonyl)arenethiocarboxamides by hydrazine, followed by deprotections. Kinetics experiments against rabbit muscle GPb (rmGPb) and human liver GPa (hlGPa) revealed five compounds as potent low μM inhibitors with three of these on the submicromolar range for rmGPa. X-ray crystallographic analysis sourced the potency to a combination of favorable interactions from the 1,2,4-triazole and suitable aryl substituents in the GP catalytic site. The compounds also revealed promising calculated pharmacokinetic profiles.

  • Organizational Affiliation

    Department of Biochemistry & Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycogen phosphorylase, muscle form843Oryctolagus cuniculusMutation(s): 0 
Find proteins for P00489 (Oryctolagus cuniculus)
Explore P00489 
Go to UniProtKB:  P00489
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00489
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CKW

Download Ideal Coordinates CCD File 
C [auth A](2~{R},3~{S},4~{R},5~{R},6~{S})-2-(hydroxymethyl)-6-[5-(4-phenylphenyl)-4~{H}-1,2,4-triazol-3-yl]oxane-3,4,5-triol
C20 H21 N3 O5
Query on PLP

Download Ideal Coordinates CCD File 
C8 H10 N O6 P
Binding Affinity Annotations 
IDSourceBinding Affinity
CKW Binding MOAD:  6F3S Ki: 2380 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.156 
  • R-Value Work: 0.135 
  • R-Value Observed: 0.136 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.763α = 90
b = 128.763β = 90
c = 116.391γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-28
    Type: Initial release