Crystal structure of rabbit muscle glycogen phosphorylase in complex with 3,4-dihydro-2-quinolone

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

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Development of potent, orally active 1-substituted-3,4-dihydro-2-quinolone glycogen phosphorylase inhibitors.

Birch, A.M.Kenny, P.W.Oikonomakos, N.G.Otterbein, L.Schofield, P.Whittamore, P.R.Whalley, D.P.

(2007) Bioorg Med Chem Lett 17: 394-399

  • DOI: https://doi.org/10.1016/j.bmcl.2006.10.037
  • Primary Citation of Related Structures:  
    2IEG, 2IEI

  • PubMed Abstract: 

    A series of substituted 3,4-dihydro-2-quinolone glycogen phosphorylase inhibitors, which have potential as antidiabetic agents, is described. Initial members of the series showed good enzyme inhibitory potency but poor physical properties. Optimisation of the 1-substituent led to 2,3-dihydroxypropyl compounds which showed good in vitro potency and improved physical properties, together with good DMPK profiles and acute in vivo efficacy in a rat model. X-ray crystallographic data are presented, showing an unexpected variety of binding orientations at the dimer interface site.

  • Organizational Affiliation

    AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, UK. alan.birch@astrazeneca.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycogen phosphorylase, muscle form
A, B
842Oryctolagus 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 FRY

Download Ideal Coordinates CCD File 
D [auth A],
F [auth B]
C18 H15 Cl N4 O3 S
Query on PLR

Download Ideal Coordinates CCD File 
C [auth A],
E [auth B]
C8 H12 N O5 P
Binding Affinity Annotations 
IDSourceBinding Affinity
FRY Binding MOAD:  2IEG IC50: 135 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.12α = 90
b = 125.156β = 90
c = 128.387γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance