1ZAI

Fructose-1,6-bisphosphate Schiff base intermediate in FBP aldolase from rabbit muscle


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

High Resolution Reaction Intermediates of Rabbit Muscle Fructose-1,6-bisphosphate Aldolase: substrate cleavage and induced fit.

St-Jean, M.Lafrance-Vanasse, J.Liotard, B.Sygusch, J.

(2005) J.Biol.Chem. 280: 27262-27270

  • DOI: 10.1074/jbc.M502413200
  • Primary Citation of Related Structures:  1ZAH, 1ZAJ, 1ZAL

  • PubMed Abstract: 
  • Crystal structures were determined to 1.8 A resolution of the glycolytic enzyme fructose-1,6-bis(phosphate) aldolase trapped in complex with its substrate and a competitive inhibitor, mannitol-1,6-bis(phosphate). The enzyme substrate complex correspo ...

    Crystal structures were determined to 1.8 A resolution of the glycolytic enzyme fructose-1,6-bis(phosphate) aldolase trapped in complex with its substrate and a competitive inhibitor, mannitol-1,6-bis(phosphate). The enzyme substrate complex corresponded to the postulated Schiff base intermediate and has reaction geometry consistent with incipient C3-C4 bond cleavage catalyzed Glu-187, which is adjacent by to the Schiff base forming Lys-229. Atom arrangement about the cleaved bond in the reaction intermediate mimics a pericyclic transition state occurring in nonenzymatic aldol condensations. Lys-146 hydrogen-bonds the substrate C4 hydroxyl and assists substrate cleavage by stabilizing the developing negative charge on the C4 hydroxyl during proton abstraction. Mannitol-1,6-bis(phosphate) forms a noncovalent complex in the active site whose binding geometry mimics the covalent carbinolamine precursor. Glu-187 hydrogen-bonds the C2 hydroxyl of the inhibitor in the enzyme complex, substantiating a proton transfer role by Glu-187 in catalyzing the conversion of the carbinolamine intermediate to Schiff base. Modeling of the acyclic substrate configuration into the active site shows Glu-187, in acid form, hydrogen-bonding both substrate C2 carbonyl and C4 hydroxyl, thereby aligning the substrate ketose for nucleophilic attack by Lys-229. The multifunctional role of Glu-187 epitomizes a canonical mechanistic feature conserved in Schiff base-forming aldolases catalyzing carbohydrate metabolism. Trapping of tagatose-1,6-bis(phosphate), a diastereoisomer of fructose 1,6-bis(phosphate), displayed stereospecific discrimination and reduced ketohexose binding specificity. Each ligand induces homologous conformational changes in two adjacent alpha-helical regions that promote phosphate binding in the active site.


    Organizational Affiliation

    Department of Biochemistry, Université de Montréal, Montréal, Québec H3C 3J7, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fructose-bisphosphate aldolase A
A, B, C, D
363Oryctolagus cuniculusGene Names: ALDOA
EC: 4.1.2.13
Find proteins for P00883 (Oryctolagus cuniculus)
Go to Gene View: ALDOA
Go to UniProtKB:  P00883
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2FP
Query on 2FP

Download SDF File 
Download CCD File 
A, B, C, D
1,6-FRUCTOSE DIPHOSPHATE (LINEAR FORM)
C6 H14 O12 P2
XPYBSIWDXQFNMH-PYWDMBMJSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.155 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 82.996α = 90.00
b = 103.228β = 98.77
c = 84.305γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data reduction
CNSrefinement
DENZOdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-10
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description