1IVR

STRUCTURE OF ASPARTATE AMINOTRANSFERASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.153 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Aspartate aminotransferase complexed with erythro-beta-hydroxyaspartate: crystallographic and spectroscopic identification of the carbinolamine intermediate.

von Stosch, A.G.

(1996) Biochemistry 35: 15260-15268

  • DOI: 10.1021/bi960994z

  • PubMed Abstract: 
  • The crystal structure of mitochondrial aspartate aminotransferase (mAAT) of chicken complexed with erythro-beta-hydroxyaspartate has been determined at 2.4 A resolution. Pregrown crystals of mAAT complexed with the inhibitor maleate (closed enzyme co ...

    The crystal structure of mitochondrial aspartate aminotransferase (mAAT) of chicken complexed with erythro-beta-hydroxyaspartate has been determined at 2.4 A resolution. Pregrown crystals of mAAT complexed with the inhibitor maleate (closed enzyme conformation, orthorhombic space group C222(1)) were soaked in solutions of erythro-beta-hydroxyaspartate. The ligand exchange was monitored by microspectrophotometry. The active site turned out to be predominantly occupied by the carbinolamine intermediate. The carbinolamine is a true intermediate of the catalytic cycle forming the last covalently bound enzyme:substrate complex before release of the keto acid product. Occupancies of approximately 80% for the carbinolamine and of approximately 20% for the quinonoid intermediate were obtained. Two hydrogen bonds were identified that are potentially relevant for the accumulation of the carbinolamine intermediate: one to the hydroxyl group of Tyr 70* and the other to the epsilon-NH2 group of Lys 258.


    Related Citations: 
    • Structural Basis for Catalysis by Aspartate Aminotransferase
      Jansonius, J.N.,Vincent, M.G.
      (1987) Biological Macromolecules and Assemblies 3: 187



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ASPARTATE AMINOTRANSFERASE
A
401Gallus gallusGene Names: GOT2
EC: 2.6.1.1, 2.6.1.7
Find proteins for P00508 (Gallus gallus)
Go to Gene View: GOT2
Go to UniProtKB:  P00508
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CBA
Query on CBA

Download SDF File 
Download CCD File 
A
N-PYRIDOXYL-2,3-DIHYDROXYASPARTIC ACID-5-MONOPHOSPHATE
C12 H17 N2 O11 P
SMJZVFGOJYUMBO-JOYOIKCWSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Work: 0.153 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 69.700α = 90.00
b = 91.400β = 90.00
c = 128.500γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement
TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1996-10-11 
  • Released Date: 1997-07-23 
  • Deposition Author(s): Graf Von Stosch, A.

Revision History 

  • Version 1.0: 1997-07-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2018-04-18
    Type: Data collection, Other