1ARH

ASPARTATE AMINOTRANSFERASE, Y225R/R386A MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Changing the reaction specificity of a pyridoxal-5'-phosphate-dependent enzyme.

Graber, R.Kasper, P.Malashkevich, V.N.Sandmeier, E.Berger, P.Gehring, H.Jansonius, J.N.Christen, P.

(1995) Eur.J.Biochem. 232: 686-690

  • Primary Citation of Related Structures:  1ARG

  • PubMed Abstract: 
  • The electron distribution in the coenzyme-substrate adduct of aspartate aminotransferase was changed by replacing active-site Arg386 with alanine and introducing a new arginine residue nearby. [Y225R, R386A]Aspartate aminotransferase decarboxylates L ...

    The electron distribution in the coenzyme-substrate adduct of aspartate aminotransferase was changed by replacing active-site Arg386 with alanine and introducing a new arginine residue nearby. [Y225R, R386A]Aspartate aminotransferase decarboxylates L-aspartate to L-alanine (kcat = 0.04 s-1), while its transaminase activity towards dicarboxylic amino acids is decreased by three orders of magnitude (kcat = 0.19 s-1). Molecular-dynamics simulations based on the crystal structure of the mutant enzyme suggest that a new hydrogen bond to the imine N atom of the pyridoxal-5'-phosphate- aspartate adduct and an altered electrostatic potential around its beta-carboxylate group underlie the 650,000-fold increase in the ratio of beta-decarboxylase/transaminase activity.


    Organizational Affiliation

    Biochemisches Institut, Universit├Ąt Z├╝rich, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ASPARTATE AMINOTRANSFERASE
A, B
396Escherichia coli (strain K12)Gene Names: aspC
EC: 2.6.1.1
Find proteins for P00509 (Escherichia coli (strain K12))
Go to UniProtKB:  P00509
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PPD
Query on PPD

Download SDF File 
Download CCD File 
A, B
2-[(3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYLENE)-AMINO]-SUCCINIC ACID
PYRIDOXYL-ASPARTIC ACID-5-MONOPHOSPHATE
C12 H17 N2 O9 P
UKHLSCZNRCHWTM-VIFPVBQESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 84.120α = 90.00
b = 79.610β = 117.91
c = 89.850γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement
MADNESdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-11-14
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance