1HKC

RECOMBINANT HUMAN HEXOKINASE TYPE I COMPLEXED WITH GLUCOSE AND PHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.174 

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This is version 1.3 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
  • Primary Citation of Related Structures:  
    1HKC

  • 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 necessary for the relief of product inhibition by phosphate ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
D-GLUCOSE 6-PHOSPHOTRANSFERASEA917Homo sapiensMutation(s): 0 
Gene Names: HK1
EC: 2.7.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P19367 (Homo sapiens)
Explore P19367 
Go to UniProtKB:  P19367
PHAROS:  P19367
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC (Subject of Investigation/LOI)
Query on BGC

Download Ideal Coordinates CCD File 
B [auth A]beta-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
PO4
Query on PO4

Download Ideal Coordinates CCD File 
C [auth A], D [auth A]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
E [auth A], F [auth A]POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.174 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 175.09α = 90
b = 175.09β = 90
c = 99.47γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-11-11
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary