1FSA

THE T-STATE STRUCTURE OF LYS 42 TO ALA MUTANT OF THE PIG KIDNEY FRUCTOSE 1,6-BISPHOSPHATASE EXPRESSED IN E. COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Evidence for an active T-state pig kidney fructose 1,6-bisphosphatase: interface residue Lys-42 is important for allosteric inhibition and AMP cooperativity.

Lu, G.Stec, B.Giroux, E.L.Kantrowitz, E.R.

(1996) Protein Sci. 5: 2333-2342

  • DOI: 10.1002/pro.5560051120

  • PubMed Abstract: 
  • During the R-->T transition in the tetrameric pig kidney fructose-1,6-bisphosphatase (Fru-1,6-P2ase, EC 3.1.3.11) a major change in the quaternary structure of the enzyme occurs that is induced by the binding of the allosteric inhibitor AMP (Ke HM, L ...

    During the R-->T transition in the tetrameric pig kidney fructose-1,6-bisphosphatase (Fru-1,6-P2ase, EC 3.1.3.11) a major change in the quaternary structure of the enzyme occurs that is induced by the binding of the allosteric inhibitor AMP (Ke HM, Liang JY, Zhang Y, Lipscomb WN, 1991, Biochemistry 30:4412-4420). The change in quaternary structure involving the rotation of the upper dimer by 17 degrees relative to the lower dimer is coupled to a series of structural changes on the secondary and tertiary levels. The structural data indicate that Lys-42 is involved in a complex set of intersubunit interactions across the dimer-dimer interface with residues of the 190's loop, a loop located at the pivot of the allosteric rotation. In order to test the function of Lys-42, we have replaced it with alanine using site-specific mutagenesis. The kcat and K(m) values for Lys-42-->Ala Fru-1,6-P2ase were 11 s-1 and 3.3 microM, respectively, resulting in a mutant enzyme that was slightly less efficient catalytically than the normal pig kidney enzyme. Although the Lys-42-->Ala Fru-1,6-P2ase was similar kinetically in terms of K(m) and kcat, the response to inhibition by AMP was significantly different than that of the normal pig kidney enzyme. Not only was AMP inhibition no longer cooperative, but also it occurred in two stages, corresponding to high- and low-affinity binding sites. Saturation of the high-affinity sites only reduced the activity by 30%, compared to 100% for the wild-type enzyme. In order to determine in what structural state the enzyme was after saturation of the high-affinity sites, the Lys-42-->Ala enzyme was crystallized in the presence of Mn2+, fructose-6-phosphate (Fru-6-P), and 100 microM AMP and the data collected to 2.3 A resolution. The X-ray structure showed the T state with AMP binding with full occupancy to the four regulatory sites and the inhibitor Fru-6-P bound at the active sites. The results reported here suggest that, in the normal pig kidney enzyme, the interactions between Lys-42 and residues of the 190's loop, are important for propagation of AMP cooperativity to the adjacent subunit across the dimer-dimer interface as opposed to the monomer-monomer interface, and suggest that AMP cooperativity is necessary for full allosteric inhibition by AMP.


    Related Citations: 
    • Crystal Structure of the Neutral Form of Fructose-1,6-Bisphosphatase Complexed with the Product Fructose 6-Phosphate at 2.1-A Resolution
      Ke, H.,Zhang, Y.,Liang, J.Y.,Lipscomb, W.N.
      (1991) Proc.Natl.Acad.Sci.USA 88: 2989
    • Crystal Structures of the Active Site Mutant (Arg-243-->Ala) in the T and R Allosteric States of Pig Kidney Fructose-1,6-Bisphosphatase Expressed in Escherichia Coli
      Stec, B.,Abraham, R.,Giroux, E.,Kantrowitz, E.R.
      (1996) Protein Sci. 5: 1541
    • Crystal Structure of Fructose-1,6-Bisphosphatase Complexed with Fructose 2,6-Bisphosphate, AMP, and Zn2+ at 2.0-A Resolution: Aspects of Synergism between Inhibitors
      Xue, Y.,Huang, S.,Liang, J.Y.,Zhang, Y.,Lipscomb, W.N.
      (1994) Proc.Natl.Acad.Sci.USA 91: 12482


    Organizational Affiliation

    Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02167, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FRUCTOSE 1,6-BISPHOSPHATASE
A, B
337Sus scrofaGene Names: FBP1 (FBP)
EC: 3.1.3.11
Find proteins for P00636 (Sus scrofa)
Go to Gene View: FBP1
Go to UniProtKB:  P00636
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
A, B
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
AMP
Query on AMP

Download SDF File 
Download CCD File 
A, B
ADENOSINE MONOPHOSPHATE
C10 H14 N5 O7 P
UDMBCSSLTHHNCD-KQYNXXCUSA-N
 Ligand Interaction
F6P
Query on F6P

Download SDF File 
Download CCD File 
A, B
FRUCTOSE-6-PHOSPHATE
C6 H13 O9 P
BGWGXPAPYGQALX-ARQDHWQXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.184 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 61.050α = 90.00
b = 166.720β = 90.00
c = 79.980γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
SDMSdata reduction
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-09-04
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model