1TAR

CRYSTALLINE MITOCHONDRIAL ASPARTATE AMINOTRANSFERASE EXISTS IN ONLY TWO CONFORMATIONS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystalline mitochondrial aspartate aminotransferase exists in only two conformations.

Hohenester, E.Jansonius, J.N.

(1994) J Mol Biol 236: 963-968

  • Primary Citation of Related Structures:  
    1TAT, 1TAS, 1TAR

  • PubMed Abstract: 
  • The subunits of the alpha 2-dimeric enzyme aspartate aminotransferase are composed of two distinct domains, one large and one small. The active sites are situated close to both the intersubunit and the interdomain interface. Binding of substrate analogues to the active site induces a large conformational change in the enzyme, whereby the small domain rotates by 13 degrees relative to the large domain and completely buries the ligand ...

    The subunits of the alpha 2-dimeric enzyme aspartate aminotransferase are composed of two distinct domains, one large and one small. The active sites are situated close to both the intersubunit and the interdomain interface. Binding of substrate analogues to the active site induces a large conformational change in the enzyme, whereby the small domain rotates by 13 degrees relative to the large domain and completely buries the ligand. We have determined the crystal structures of chicken mitochondrial aspartate aminotransferase (mAATase) in two new crystal forms. A comparison of the structures of mAATase in five crystal forms, including both the unliganded and the liganded enzyme, shows that mAATase exists in either one of two unique conformations, with only minimal adaptations to the crystal lattice. This suggests that both the open, unliganded and closed, liganded structure of mAATase are, to a large extent, stabilized by intramolecular interactions, and are consequently representative of functional states of the protein in solution. A 2-fold-symmetric packing interaction between small domains occurring identically in three crystal forms of mAATase is described.


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

    Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ASPARTATE AMINOTRANSFERASEA, B401Gallus gallusMutation(s): 0 
Gene Names: GOT2
EC: 2.6.1.1 (PDB Primary Data), 2.6.1.7 (UniProt)
UniProt
Find proteins for P00508 (Gallus gallus)
Explore P00508 
Go to UniProtKB:  P00508
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP (Subject of Investigation/LOI)
Query on PLP

Download Ideal Coordinates CCD File 
C [auth A], D [auth B]PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Observed: 0.194 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.4α = 83.1
b = 59.4β = 104.8
c = 65.5γ = 83.3
Software Package:
Software NamePurpose
TNTrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other