3QIC

The structure of human glucokinase E339K mutation

• PDB DOI: https://doi.org/10.2210/pdb3QIC/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2011-01-27 Released: 2011-06-01 
• Deposition Author(s): Liu, Q., Liu, S., Liu, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.250 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 

Literature

Crystal structure of E339K mutated human glucokinase reveals changes in the ATP binding site.

Liu, Q., Shen, Y., Liu, S., Weng, J., Liu, J.

(2011) FEBS Lett 585: 1175-1179

• PubMed: 21420961 
• DOI: https://doi.org/10.1016/j.febslet.2011.03.026
• Primary Citation of Related Structures:  
  3QIC


• PubMed Abstract: 
  

  Human glucokinase (GK) plays an important role in glucose homeostasis. An E339K mutation in GK was recently found to be associated with hyperglycemia. It showed lower enzyme activity and impaired protein stability compared to the wild-type enzyme. Here, we present the crystal structure of E339K GK in complex with glucose. This mutation results in a conformational change of His416, spatially interfering with adenosine-triphosphate (ATP) binding. Furthermore, Ser411 at the ATP binding site is phosphorylated and then hydrogen bonded with Thr82, physically blocking the ATP binding. These findings provide structural basis for the reduced activity of this mutant.

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Organizational Affiliation: 

State Key Laboratory of Respiratory Diseases, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 53.81 kDa 
• Atom Count: 3,662 
• Modelled Residue Count: 453 
• Deposited Residue Count: 470 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glucokinase	A	470	Homo sapiens	Mutation(s): 1  Gene Names: GCK EC: 2.7.1.2
UniProt & NIH Common Fund Data Resources
Find proteins for P35557 (Homo sapiens) Explore P35557  Go to UniProtKB:  P35557
PHAROS:  P35557 GTEx:  ENSG00000106633

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GLC	B [auth A]	alpha-D-glucopyranose C6 H12 O6 WQZGKKKJIJFFOK-DVKNGEFBSA-N
GOL	C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	A	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.250 
• R-Value Work: 0.213 
• R-Value Observed: 0.214 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 80.74	α = 90
b = 80.74	β = 90
c = 178.41	γ = 90

Software Package:

Software Name	Purpose
MAR345	data collection
MOLREP	phasing
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-06-01 
Deposition Author(s): Liu, Q., Liu, S., Liu, J.

Revision History  

• Version 1.0: 2011-06-01
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-11-08
  Changes: Refinement description
• Version 1.3: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Database references, Derived calculations, Structure summary
• Version 1.4: 2023-11-01
  Changes: Data collection, Database references, Refinement description, Structure summary