4Z5X

Glycogen phosphorylase in complex with gallic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Natural flavonoids as antidiabetic agents. The binding of gallic and ellagic acids to glycogen phosphorylase b.

Kyriakis, E.Stravodimos, G.A.Kantsadi, A.L.Chatzileontiadou, D.S.Skamnaki, V.T.Leonidas, D.D.

(2015) FEBS Lett 589: 1787-1794

  • DOI: https://doi.org/10.1016/j.febslet.2015.05.013
  • Primary Citation of Related Structures:  
    4YUA, 4Z5X

  • PubMed Abstract: 

    We present a study on the binding of gallic acid and its dimer ellagic acid to glycogen phosphorylase (GP). Ellagic acid is a potent inhibitor with Kis of 13.4 and 7.5 μM, in contrast to gallic acid which displays Kis of 1.7 and 3.9 mM for GPb and GPa, respectively. Both compounds are competitive inhibitors with respect to the substrate, glucose-1-phoshate, and non-competitive to the allosteric activator, AMP. However, only ellagic acid functions with glucose in a strongly synergistic mode. The crystal structures of the GPb-gallic acid and GPb-ellagic acid complexes were determined at high resolution, revealing that both ligands bind to the inhibitor binding site of the enzyme and highlight the structural basis for the significant difference in their inhibitory potency.


  • Organizational Affiliation

    Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycogen phosphorylase, muscle form843Oryctolagus cuniculusMutation(s): 0 
EC: 2.4.1.1
UniProt
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
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.161 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.486α = 90
b = 128.486β = 90
c = 116.634γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
XSCALEdata 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: 2015-05-13
    Type: Initial release
  • Version 1.1: 2015-06-03
    Changes: Database references
  • Version 1.2: 2015-07-15
    Changes: Database references
  • Version 1.3: 2018-03-07
    Changes: Data collection