4QS8

Arabidopsis Hexokinase 1 (AtHXK1) structure in ligand-free form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.798 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Biochemical and structural study of Arabidopsis hexokinase 1

Feng, J.Zhao, S.Chen, X.Wang, W.Dong, W.Chen, J.Shen, J.-R.Liu, L.Kuang, T.

(2015) Acta Crystallogr.,Sect.D 71: 367-375

  • DOI: 10.1107/S1399004714026091
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hexokinase 1 from Arabidopsis thaliana (AtHXK1) plays a dual role in glycolysis and sugar sensing for vital metabolic and physiological processes. The uncoupling of glucose signalling from glucose metabolism was demonstrated by the analysis of two mu ...

    Hexokinase 1 from Arabidopsis thaliana (AtHXK1) plays a dual role in glycolysis and sugar sensing for vital metabolic and physiological processes. The uncoupling of glucose signalling from glucose metabolism was demonstrated by the analysis of two mutants (AtHXK1(G104D) and AtHXK1(S177A)) that are catalytically inactive but still functional in signalling. In this study, substrate-binding experiments indicate that the two catalytically inactive mutants have a high affinity for glucose, and an ordered substrate-binding mechanism has been observed for wild-type AtHXK1. The structure of AtHXK1 was determined both in its inactive unliganded form and in its active glucose-bound form at resolutions of 1.8 and 2.0 Å, respectively. These structures reveal a domain rearrangement of AtHXK1 upon glucose binding. The 2.1 Å resolution structure of AtHXK1(S177A) in the glucose-bound form shows similar glucose-binding interactions as the wild type. A glucose-sensing network has been proposed based on these structures. Taken together, the results provide a structural explanation for the dual functions of AtHXK1.


    Organizational Affiliation

    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Haidian District, Beijing 100093, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hexokinase-1
A
474Arabidopsis thalianaMutation(s): 0 
Gene Names: HXK1 (GIN2)
EC: 2.7.1.1
Find proteins for Q42525 (Arabidopsis thaliana)
Go to UniProtKB:  Q42525
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.798 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.239α = 90.00
b = 72.473β = 90.00
c = 109.059γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
ADSCdata collection
PHENIXrefinement
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-08-19
    Type: Database references