1HKC

RECOMBINANT HUMAN HEXOKINASE TYPE I COMPLEXED WITH GLUCOSE AND PHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.174 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Regulation of hexokinase I: crystal structure of recombinant human brain hexokinase complexed with glucose and phosphate.

Aleshin, A.E.Zeng, C.Bartunik, H.D.Fromm, H.J.Honzatko, R.B.

(1998) J.Mol.Biol. 282: 345-357

  • DOI: 10.1006/jmbi.1998.2017

  • PubMed Abstract: 
  • Hexokinase I, the pacemaker of glycolysis in brain tissue and red blood cells, is comprised of two similar domains fused into a single polypeptide chain. The C-terminal half of hexokinase I is catalytically active, whereas the N-terminal half is nece ...

    Hexokinase I, the pacemaker of glycolysis in brain tissue and red blood cells, is comprised of two similar domains fused into a single polypeptide chain. The C-terminal half of hexokinase I is catalytically active, whereas the N-terminal half is necessary for the relief of product inhibition by phosphate. A crystalline complex of recombinant human hexokinase I with glucose and phosphate (2.8 A resolution) reveals a single binding site for phosphate and glucose at the N-terminal half of the enzyme. Glucose and phosphate stabilize the N-terminal half in a closed conformation. Unexpectedly, glucose binds weakly to the C-terminal half of the enzyme and does not by itself stabilize a closed conformation. Evidently a stable, closed C-terminal half requires either ATP or glucose 6-phosphate along with glucose. The crystal structure here, in conjunction with other studies in crystallography and directed mutation, puts the phosphate regulatory site at the N-terminal half, the site of potent product inhibition at the C-terminal half, and a secondary site for the weak interaction of glucose 6-phosphate at the N-terminal half of the enzyme. The relevance of crystal structures of hexokinase I to the properties of monomeric hexokinase I and oligomers of hexokinase I bound to the surface of mitochondria is discussed.


    Related Citations: 
    • The Mechanism of Regulation of Hexokinase: New Insights from the Crystal Structure of Recombinant Human Brain Hexokinase Complexed with Glucose and Glucose-6-Phosphate
      Aleshin, A.E.,Zeng, C.,Bourenkov, G.P.,Bartunik, H.D.,Fromm, H.J.,Honzatko, R.B.
      (1998) Structure 6: 39
    • Crystallization and Preliminary X-Ray Analysis of Human Brain Hexokinase
      Aleshin, A.E.,Zeng, C.,Fromm, H.J.,Honzatko, R.B.
      (1996) FEBS Lett. 391: 9


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Iowa State University, Ames, IA 50011, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
D-GLUCOSE 6-PHOSPHOTRANSFERASE
A
917Homo sapiensGene Names: HK1
EC: 2.7.1.1
Find proteins for P19367 (Homo sapiens)
Go to Gene View: HK1
Go to UniProtKB:  P19367
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
BGC
Query on BGC

Download SDF File 
Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.174 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 175.090α = 90.00
b = 175.090β = 90.00
c = 99.470γ = 120.00
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
X-PLORphasing
X-PLORrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-11-11
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance