4DCH

Insights into Glucokinase Activation Mechanism: Observation of Multiple Distinct Protein Conformations


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Insights into Mechanism of Glucokinase Activation: OBSERVATION OF MULTIPLE DISTINCT PROTEIN CONFORMATIONS.

Liu, S.Ammirati, M.J.Song, X.Knafels, J.D.Zhang, J.Greasley, S.E.Pfefferkorn, J.A.Qiu, X.

(2012) J Biol Chem 287: 13598-13610

  • DOI: 10.1074/jbc.M111.274126
  • Primary Citation of Related Structures:  
    4DCH, 4DHY, 3VF6, 3VEV, 3VEY

  • PubMed Abstract: 
  • Human glucokinase (GK) is a principal regulating sensor of plasma glucose levels. Mutations that inactivate GK are linked to diabetes, and mutations that activate it are associated with hypoglycemia. Unique kinetic properties equip GK for its regulatory ...

    Human glucokinase (GK) is a principal regulating sensor of plasma glucose levels. Mutations that inactivate GK are linked to diabetes, and mutations that activate it are associated with hypoglycemia. Unique kinetic properties equip GK for its regulatory role: although it has weak basal affinity for glucose, positive cooperativity in its binding of glucose causes a rapid increase in catalytic activity when plasma glucose concentrations rise above euglycemic levels. In clinical trials, small molecule GK activators (GKAs) have been efficacious in lowering plasma glucose and enhancing glucose-stimulated insulin secretion, but they carry a risk of overly activating GK and causing hypoglycemia. The theoretical models proposed to date attribute the positive cooperativity of GK to the existence of distinct protein conformations that interconvert slowly and exhibit different affinities for glucose. Here we report the respective crystal structures of the catalytic complex of GK and of a GK-glucose complex in a wide open conformation. To assess conformations of GK in solution, we also carried out small angle x-ray scattering experiments. The results showed that glucose dose-dependently converts GK from an apo conformation to an active open conformation. Compared with wild type GK, activating mutants required notably lower concentrations of glucose to be converted to the active open conformation. GKAs decreased the level of glucose required for GK activation, and different compounds demonstrated distinct activation profiles. These results lead us to propose a modified mnemonic model to explain cooperativity in GK. Our findings may offer new approaches for designing GKAs with reduced hypoglycemic risk.


    Organizational Affiliation

    Structural Biology and Biophysics, Pfizer Groton Laboratories, Groton, Connecticut 06340, USA. shenping.liu@pfizer.com



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glucokinase A473Homo sapiensMutation(s): 0 
Gene Names: GCK
EC: 2.7.1.2 (PDB Primary Data), 2.7.1.1 (UniProt)
Find proteins for P35557 (Homo sapiens)
Explore P35557 
Go to UniProtKB:  P35557
NIH Common Fund Data Resources
PHAROS:  P35557
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4DC
Query on 4DC

Download Ideal Coordinates CCD File 
A
(2R)-3-cyclopentyl-2-[4-(methylsulfonyl)phenyl]-N-(1,3-thiazol-2-yl)propanamide
C18 H22 N2 O3 S2
NEQSWPCDHDQINX-MRXNPFEDSA-N
 Ligand Interaction
GLC
Query on GLC

Download Ideal Coordinates CCD File 
A
alpha-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
IOD
Query on IOD

Download Ideal Coordinates CCD File 
A
IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
4DCEC50:  690   nM  BindingDB
4DCEC50:  26700   nM  BindingDB
4DCEC50:  500   nM  BindingDB
4DCEC50:  2200   nM  BindingDB
4DCKd:  500   nM  BindingDB
4DCEC50:  1000   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.917α = 90
b = 85.794β = 104.4
c = 72.939γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction
Web-Icedata collection
DENZOdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-08
    Type: Initial release
  • Version 1.1: 2012-04-11
    Changes: Database references
  • Version 1.2: 2012-05-09
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary