1HKG

STRUCTURAL DYNAMICS OF YEAST HEXOKINASE DURING CATALYSIS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural dynamics of yeast hexokinase during catalysis.

Steitz, T.A.Shoham, M.Bennett Jr., W.S.

(1981) Philos.Trans.R.Soc.London,Ser.B 293: 43-52


  • PubMed Abstract: 
  • The binding of the substrate glucose to yeast hexokinase results in a substantial enzyme conformational change that is essential for catalysis and may be important for the enzyme's specificity, as well as the control of its activity. From high-resolu ...

    The binding of the substrate glucose to yeast hexokinase results in a substantial enzyme conformational change that is essential for catalysis and may be important for the enzyme's specificity, as well as the control of its activity. From high-resolution crystal structures of the monomeric enzyme crystallized both in the presence and in the absence of glucose, we find that glucose binds into the deep cleft that separates the molecule into two lobes and causes these two lobes to move together and close off the cleft. The structure of the hexokinase crystallized in the presence of xylose and ADP is being determined at low resolution. In this crystal form, the enzyme was thought to be in the conformation of the ternary complex. However, a low-resolution structure of this crystal form shows clearly that the enzyme is in the 'open' form and is not a ternary complex. Crystals of the A isozyme with glucose and ADP may be. Further, chemically sequenced tryptic peptides are being incorporated into the model obtained by crystallographic refinement at 2.1 A resolution. Completion of the sequence and the structure of the ternary complex should allow a detailed description of the enzymatic mechanism of this kinase and the role of substrate-induced conformational changes in catalysis and control.


    Related Citations: 
    • Structure of a complex between yeast hexokinase A and glucose. II. Detailed comparisons of conformation and active site configuration with the native hexokinase B monomer and dimer.
      Bennett Jr., W.S.,Steitz, T.A.
      (1980) J.Mol.Biol. 140: 211
    • Structure of a complex between yeast hexokinase A and glucose. I. Structure determination and refinement at 3.5 A resolution.
      Bennett Jr., W.S.,Steitz, T.A.
      (1980) J.Mol.Biol. 140: 183
    • Glucose-induced conformational change in yeast hexokinase.
      Bennett Jr., W.S.,Steitz, T.A.
      (1978) Proc.Natl.Acad.Sci.USA 75: 4848



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEXOKINASE A
A
457Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: HXK1 (HKA)
EC: 2.7.1.1
Find proteins for P04806 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P04806
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
A
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 144.800α = 90.00
b = 78.800β = 90.00
c = 61.900γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1981-02-26
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2012-04-25
    Type: Database references, Structure summary