5MEM image
Deposition Date 2016-11-15
Release Date 2017-11-29
Last Version Date 2025-04-09
Entry Detail
PDB ID:
5MEM
Title:
A potent fluorescent inhibitor of glycogen phosphorylase as a catalytic site probe.
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
1.78 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Glycogen phosphorylase, muscle form
Gene (Uniprot):PYGM
Chain IDs:A
Chain Length:843
Number of Molecules:1
Biological Source:Oryctolagus cuniculus
Primary Citation
A New Potent Inhibitor of Glycogen Phosphorylase Reveals the Basicity of the Catalytic Site.
Chemistry 23 8800 8805 (2017)
PMID: 28493496 DOI: 10.1002/chem.201701591

Abstact

The design and synthesis of a glucose-based acridone derivative (GLAC), a potent inhibitor of glycogen phosphorylase (GP) are described. GLAC is the first inhibitor of glycogen phosphorylase, the electronic absorption properties of which are clearly distinguishable from those of the enzyme. This allows probing subtle interactions in the catalytic site. The GLAC absorption spectra, associated with X-ray crystallography and quantum chemistry calculations, reveal that part of the catalytic site of GP behaves as a highly basic environment in which GLAC exists as a bis-anion. This is explained by water-bridged hydrogen-bonding interactions with specific catalytic site residues.

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Primary Citation of related structures