1EWD

FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE FROM RABBIT MUSCLE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.464 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

A conserved glutamate residue exhibits multifunctional catalytic roles in D-fructose-1,6-bisphosphate aldolases.

MAURADY, A.ZDANOV, A.De Moissac, D.Beaudry, D.SYGUSCH, J.

(2002) J.Biol.Chem. 277: 9474-9483

  • DOI: 10.1074/jbc.M107600200
  • Primary Citation of Related Structures:  1EWE, 1EWG, 1EX5, 3B8D

  • PubMed Abstract: 
  • The aldolase catalytic cycle consists of a number of proton transfers that interconvert covalent enzyme intermediates. Glu-187 is a conserved amino acid that is located in the mammalian fructose-1,6-bisphosphate aldolase active site. Its central loca ...

    The aldolase catalytic cycle consists of a number of proton transfers that interconvert covalent enzyme intermediates. Glu-187 is a conserved amino acid that is located in the mammalian fructose-1,6-bisphosphate aldolase active site. Its central location, within hydrogen bonding distance of three other conserved active site residues: Lys-146, Glu-189, and Schiff base-forming Lys-229, makes it an ideal candidate for mediating proton transfers. Point mutations, Glu-187--> Gln, Ala, which would inhibit proton transfers significantly, compromise activity. Trapping of enzymatic intermediates in Glu-187 mutants defines a proton transfer role for Glu-187 in substrate cleavage and Schiff base formation. Structural data show that loss of Glu-187 negative charge results in hydrogen bond formation between Lys-146 and Lys-229 consistent with a basic pK(a) for Lys-229 in native enzyme and supporting nucleophilic activation of Lys-229 by Glu-187 during Schiff base formation. The crystal structures also substantiate Glu-187 and Glu-189 as present in ionized form in native enzyme, compatible with their role of catalyzing proton exchange with solvent as indicated from solvent isotope effects. The proton exchange mechanism ensures Glu-187 basicity throughout the catalytic cycle requisite for mediating proton transfer and electrostatic stabilization of ketamine intermediates. Glutamate general base catalysis is a recurrent evolutionary feature of Schiff base0forming aldolases.


    Organizational Affiliation

    Department of Biochemistry, University of Montreal, CP 6128, Station Centre Ville, Montréal, Québec H3C 3J7, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FRUCTOSE 1,6-BISPHOSPHATE ALDOLASE
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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.464 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 164.194α = 90.00
b = 57.575β = 102.66
c = 85.349γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
X-GENdata scaling
X-PLORmodel building
X-GENdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-01-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description