Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 87.97 kDa 
• Atom Count: 6688 
• Modelled Residue Count: 792 
• Deposited Residue Count: 792 
• Unique protein chains: 1

1ARG

Aspartate aminotransferase, phospho-5'-pyridoxyl aspartate complex

• PDB DOI: 10.2210/pdb1ARG/pdb

• Classification: TRANSFERASE (AMINOTRANSFERASE)
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1995-08-23 Released: 1995-11-14 
• Deposition Author(s): Malashkevich, V.N., Jansonius, J.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Observed: 0.198 

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

• PubMed: 7556224 
• DOI: 10.1111/j.1432-1033.1995.tb20861.x
• Primary Citation of Related Structures:  
  1ARG, 1ARH


• 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-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.

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Organizational Affiliation: 

Biochemisches Institut, Universität Zürich, Switzerland.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE AMINOTRANSFERASE	A, B	396	Escherichia coli	Mutation(s): 0  EC: 2.6.1.1
UniProt
Find proteins for P00509 (Escherichia coli (strain K12)) Explore P00509  Go to UniProtKB:  P00509

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PPD	C [auth A], D [auth B]	2-[(3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYLENE)-AMINO]-SUCCINIC ACID C12 H17 N2 O9 P UKHLSCZNRCHWTM-VIFPVBQESA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Observed: 0.198 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.39	α = 90
b = 78.95	β = 118.54
c = 89.29	γ = 90

Software Package:

Software Name	Purpose
TNT	refinement
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-08-23 
• Released Date: 1995-11-14 
Deposition Author(s): Malashkevich, V.N., Jansonius, J.N.

Revision History  

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