3NP7

Glycogen phosphorylase complexed with 2,5-dihydroxy-3-(beta-D-glucopyranosyl)-chlorobenzene and 2,5-dihydroxy-4-(beta-D-glucopyranosyl)-chlorobenzene


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Halogen-substituted (C-beta-D-glucopyranosyl)-hydroquinone regioisomers: synthesis, enzymatic evaluation and their binding to glycogen phosphorylase.

Alexacou, K.M.Zhang, Y.Z.Praly, J.P.Zographos, S.E.Chrysina, E.D.Oikonomakos, N.G.Leonidas, D.D.

(2011) Bioorg.Med.Chem. 19: 5125-5136

  • DOI: 10.1016/j.bmc.2011.07.024
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Electrophilic halogenation of C-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl) 1,4-dimethoxybenzene (1) afforded regioselectively products halogenated at the para position to the D-glucosyl moiety (8, 9) that were deacetylated to 3 (chloride) and 16 (br ...

    Electrophilic halogenation of C-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl) 1,4-dimethoxybenzene (1) afforded regioselectively products halogenated at the para position to the D-glucosyl moiety (8, 9) that were deacetylated to 3 (chloride) and 16 (bromide). For preparing meta regioisomers, 1 was efficiently oxidized with CAN to afford C-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl) 1,4-benzoquinone 2 which, in either MeOH or H(2)O-THF containing few equivalents of AcCl, added hydrochloric acid to produce predominantly meta (with respect to the sugar moiety) chlorinated hydroquinone derivatives 5 and 18, this latter being deacetylated to 4. The deacetylated meta (4, 5) or para (3, 16) halohydroquinones were evaluated as inhibitors of glycogen phosphorylase (GP, a molecular target for inhibition of hepatic glycogenolysis under high glucose concentrations) by kinetics and X-ray crystallography. These compounds are competitive inhibitors of GPb with respect to α-D-glucose-1-phosphate. The measured IC(50) values (μM) [169.9±10.0 (3), 95 (4), 39.8±0.3 (5) 136.4±4.9 (16)] showed that the meta halogenated inhibitors (4, 5) are more potent than their para analogs (3, 16). The crystal structures of GPb in complex with these compounds at high resolution (1.97-2.05 Å) revealed that the inhibitors are accommodated at the catalytic site and stabilize the T conformation of the enzyme. The differences in their inhibitory potency can be interpreted in terms of variations in the interactions with protein residues of the different substituents on the aromatic part of the inhibitors.


    Organizational Affiliation

    Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, Athens, Greece.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycogen phosphorylase, muscle form
A
842Oryctolagus cuniculusMutation(s): 0 
Gene Names: PYGM
EC: 2.4.1.1
Find proteins for P00489 (Oryctolagus cuniculus)
Go to Gene View: PYGM
Go to UniProtKB:  P00489
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Z16
Query on Z16

Download SDF File 
Download CCD File 
A
(1S)-1,5-anhydro-1-(3-chloro-2,5-dihydroxyphenyl)-D-glucitol
C12 H15 Cl O7
SCGLZDHCPHCUAO-URYVQPGZSA-N
 Ligand Interaction
Z15
Query on Z15

Download SDF File 
Download CCD File 
A
(1S)-1,5-anhydro-1-(4-chloro-2,5-dihydroxyphenyl)-D-glucitol
C12 H15 Cl O7
LHMIFDKRIZSEFV-ZIQFBCGOSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
A
L-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.196 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 128.728α = 90.00
b = 128.728β = 90.00
c = 116.200γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
CNSphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-06-28 
  • Released Date: 2011-06-08 
  • Deposition Author(s): Alexacou, K.-M.

Revision History 

  • Version 1.0: 2011-06-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-08-31
    Type: Database references
  • Version 1.3: 2013-06-19
    Type: Database references
  • Version 1.4: 2019-07-17
    Type: Data collection, Derived calculations, Refinement description