3W0L image
Deposition Date 2012-10-31
Release Date 2013-07-17
Last Version Date 2023-11-08
Entry Detail
PDB ID:
3W0L
Keywords:
TRANSFERASE/TRANSFERASE INHIBITOR
Title:
The crystal structure of Xenopus Glucokinase and Glucokinase Regulatory Protein complex
Biological Source:
Source Organism:
Xenopus laevis (Taxon ID: 8355)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.92 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 21 21 21
3W0L validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Glucokinase
Gene (Uniprot):gck.L
Chain IDs:A, C
Chain Length:458
Number of Molecules:2
Biological Source:Xenopus laevis
UniProt ID:Q91753 Pfam ID:PF00349, PF03727
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Glucokinase regulatory protein
Gene (Uniprot):gckr
Chain IDs:B, D
Chain Length:619
Number of Molecules:2
Biological Source:Xenopus laevis
UniProt ID:Q91754 Pfam ID:PF20741, PF22645, PF22198
Ligand Molecules
F6R
NA
SO4
Primary Citation
Molecular basis for the role of glucokinase regulatory protein as the allosteric switch for glucokinase
Proc.Natl.Acad.Sci.USA 110 10171 10176 (2013)
PMID: 23733961 DOI: 10.1073/pnas.1300457110

Abstact

Glucokinase (GK) is a monomeric allosteric enzyme and plays a pivotal role in blood glucose homeostasis. GK is regulated by GK regulatory protein (GKRP), and indirectly by allosteric effectors of GKRP. Despite the critical roles of GK and GKRP, the molecular basis for the allosteric regulation mechanism of GK by GKRP remains unclear. We determined the crystal structure of Xenopus GK and GKRP complex in the presence of fructose-6-phosphate at 2.9 Å. GKRP binds to a super-open conformation of GK mainly through hydrophobic interaction, inhibiting the GK activity by locking a small domain of GK. We demonstrate the molecular mechanism for the modulation of GK activity by allosteric effectors of GKRP. Importantly, GKRP releases GK in a sigmoidal manner in response to glucose concentration by restricting a structural rearrangement of the GK small domain via a single ion pair. We find that GKRP acts as an allosteric switch for GK in blood glucose control by the liver.

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Primary Citation of related structures
3W0L