4LC9

Structural Basis for Regulation of Human Glucokinase by Glucokinase Regulatory Protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for regulation of human glucokinase by glucokinase regulatory protein.

Beck, T.Miller, B.G.

(2013) Biochemistry 52: 6232-6239

  • DOI: 10.1021/bi400838t

  • PubMed Abstract: 
  • Glucokinase (GCK) is responsible for maintaining glucose homeostasis in the human body. Dysfunction or misregulation of GCK causes hyperinsulinemia, hypertriglyceridemia, and type 2 diabetes. In the liver, GCK is regulated by interaction with the glu ...

    Glucokinase (GCK) is responsible for maintaining glucose homeostasis in the human body. Dysfunction or misregulation of GCK causes hyperinsulinemia, hypertriglyceridemia, and type 2 diabetes. In the liver, GCK is regulated by interaction with the glucokinase regulatory protein (GKRP), a 68 kDa polypeptide that functions as a competitive inhibitor of glucose binding to GCK. Formation of the mammalian GCK-GKRP complex is stimulated by fructose 6-phosphate and antagonized by fructose 1-phosphate. Here we report the crystal structure of the mammalian GCK-GKRP complex in the presence of fructose 6-phosphate at a resolution of 3.50 Å. The interaction interface, which totals 2060 Å(2) of buried surface area, is characterized by a small number of polar contacts and substantial hydrophobic interactions. The structure of the complex reveals the molecular basis of disease states associated with impaired regulation of GCK by GKRP. It also offers insight into the modulation of complex stability by sugar phosphates. The atomic description of the mammalian GCK-GKRP complex provides a framework for the development of novel diabetes therapeutic agents that disrupt this critical macromolecular regulatory unit.


    Organizational Affiliation

    Laboratory of Organic Chemistry, ETH Zürich , Zürich CH-8093, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glucokinase regulatory protein
A
636Rattus norvegicusMutation(s): 0 
Gene Names: Gckr
Find proteins for Q07071 (Rattus norvegicus)
Go to UniProtKB:  Q07071
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Glucokinase
B
472Homo sapiensMutation(s): 0 
Gene Names: GCK
EC: 2.7.1.2
Find proteins for P35557 (Homo sapiens)
Go to Gene View: GCK
Go to UniProtKB:  P35557
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
F6P
Query on F6P

Download SDF File 
Download CCD File 
A
FRUCTOSE-6-PHOSPHATE
C6 H13 O9 P
BGWGXPAPYGQALX-ARQDHWQXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.244 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 95.663α = 90.00
b = 105.312β = 90.00
c = 132.406γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
PHENIXrefinement
SADABSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-06-21 
  • Released Date: 2013-09-04 
  • Deposition Author(s): Beck, T., Miller, B.G.

Revision History 

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-12-25
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description