2PFK

THE CRYSTAL STRUCTURE OF UNLIGANDED PHOSPHOFRUCTOKINASE FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Crystal structure of unliganded phosphofructokinase from Escherichia coli.

Rypniewski, W.R.Evans, P.R.

(1989) J.Mol.Biol. 207: 805-821


  • PubMed Abstract: 
  • In an attempt to characterize the mechanism of co-operativity in the allosteric enzyme phosphofructokinase from Escherichia coli, crystals were grown in the absence of activating ligands. The crystal structure was determined to a resolution of 2.4 A ...

    In an attempt to characterize the mechanism of co-operativity in the allosteric enzyme phosphofructokinase from Escherichia coli, crystals were grown in the absence of activating ligands. The crystal structure was determined to a resolution of 2.4 A by the method of molecular replacement, using the known structure of the liganded active state as a starting model, and has been refined to a crystallographic R-factor of 0.168 for all data. Although the crystallization solution would be expected to contain the enzyme in its inactive conformation, with a low affinity for the co-operative substrate fructose 6-phosphate, the structure in these crystals does not show the change in quaternary structure seen in the inactive form of the Bacillus stearothermophilus enzyme (previously determined at low resolution), nor does it show any substantial change in the fructose 6-phosphate site from the structure seen in the liganded form. Compared to the liganded form, there are considerable changes around the allosteric effector site, including the disordering of the last 19 residues of the chain. It seems likely that the observed conformation corresponds an active unliganded form, in which the absence of ligand in the effector site induces structural changes that spread through much of the subunit, but cause only minor changes in the active site. It is not clear why the crystals should contain the enzyme in a high-affinity conformation, which presumably represents only a small fraction of the molecules in the crystallizing solution. However, this structure does identify the conformational changes involved in binding of the allosteric effectors.


    Related Citations: 
    • Crystallographic Structure of Allosterically Inhibited Phosphofructokinase at 7 Angstroms Resolution
      Evans, P.R.,Farrants, G.W.,Lawrence, M.C.
      (1986) J.Mol.Biol. 191: 713
    • Structure and Control of Phosphofructokinase from Bacillus Stearothermophilus
      Evans, P.R.,Hudson, P.J.
      (1979) Nature 279: 500
    • Crystal Structure of the Complex of Phosphofructokinase from Escherichia Coli with its Reaction Products
      Shirakihara, Y.,Evans, P.R.
      (1988) J.Mol.Biol. 204: 973
    • Nucleotide Sequence and High-Level Expression of the Major Escherichia Coli Phosphofructokinase
      Hellinga, H.W.,Evans, P.R.
      (1985) Eur.J.Biochem. 149: 363
    • Phosphofructokinase. Structure and Control
      Evans, P.R.,Farrants, G.W.,Hudson, P.J.
      (1981) Philos.Trans.R.Soc.London,Ser.B 293: 53
    • The Three-Dimensional Structure of Phosphofructokinase from Bacillus Stearothermophilus
      Evans, P.R.,Hudson, P.J.
      (1978) Proc.FEBS Meet. 52: 349


    Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge, England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
6-PHOSPHOFRUCTOKINASE ISOZYME I
A, B, C, D
320Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: pfkA
EC: 2.7.1.11
Find proteins for P0A796 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A796
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • Space Group: C 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 177.000α = 90.00
b = 66.400β = 118.80
c = 154.000γ = 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: 1989-01-09
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 2.0: 2018-06-06
    Type: Advisory, Atomic model, Data collection, Derived calculations, Other, Source and taxonomy