3O6W

Crystal structure of monomeric KlHxk1 in crystal form VIII (open state)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of Hexokinase KlHxk1 of Kluyveromyces lactis: A MOLECULAR BASIS FOR UNDERSTANDING THE CONTROL OF YEAST HEXOKINASE FUNCTIONS VIA COVALENT MODIFICATION AND OLIGOMERIZATION.

Kuettner, E.B.Kettner, K.Keim, A.Svergun, D.I.Volke, D.Singer, D.Hoffmann, R.Muller, E.C.Otto, A.Kriegel, T.M.Strater, N.

(2010) J Biol Chem 285: 41019-41033

  • DOI: https://doi.org/10.1074/jbc.M110.185850
  • Primary Citation of Related Structures:  
    3O08, 3O1B, 3O1W, 3O4W, 3O5B, 3O6W, 3O80, 3O8M

  • PubMed Abstract: 

    Crystal structures of the unique hexokinase KlHxk1 of the yeast Kluyveromyces lactis were determined using eight independent crystal forms. In five crystal forms, a symmetrical ring-shaped homodimer was observed, corresponding to the physiological dimer existing in solution as shown by small-angle x-ray scattering. The dimer has a head-to-tail arrangement such that the small domain of one subunit interacts with the large domain of the other subunit. Dimer formation requires favorable interactions of the 15 N-terminal amino acids that are part of the large domain with amino acids of the small domain of the opposite subunit, respectively. The head-to-tail arrangement involving both domains of the two KlHxk1 subunits is appropriate to explain the reduced activity of the homodimer as compared with the monomeric enzyme and the influence of substrates and products on dimer formation and dissociation. In particular, the structure of the symmetrical KlHxk1 dimer serves to explain why phosphorylation of conserved residue Ser-15 may cause electrostatic repulsions with nearby negatively charged residues of the adjacent subunit, thereby inducing a dissociation of the homologous dimeric hexokinases KlHxk1 and ScHxk2. Two complex structures of KlHxk1 with bound glucose provide a molecular model of substrate binding to the open conformation and the subsequent classical domain closure motion of yeast hexokinases. The entirety of the novel data extends the current concept of glucose signaling in yeast and complements the induced-fit model by integrating the events of N-terminal phosphorylation and dissociation of homodimeric yeast hexokinases.


  • Organizational Affiliation

    Institute of Bioanalytical Chemistry, Center for Biotechnology and Biomedicine, Faculty of Chemistry and Mineralogy, University of Leipzig, D-04103 Leipzig, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hexokinase
A, B
485Kluyveromyces lactisMutation(s): 0 
Gene Names: KLLA0D11352gRAG5
EC: 2.7.1.1
UniProt
Find proteins for P33284 (Kluyveromyces lactis (strain ATCC 8585 / CBS 2359 / DSM 70799 / NBRC 1267 / NRRL Y-1140 / WM37))
Explore P33284 
Go to UniProtKB:  P33284
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33284
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.54α = 90
b = 93.59β = 102.42
c = 114.29γ = 90
Software Package:
Software NamePurpose
MAR345data collection
AMoREphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-10-13
    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: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description