1OHV

4-AMINOBUTYRATE-AMINOTRANSFERASE FROM PIG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of {Gamma}-Aminobutyric Acid (Gaba) Aminotransferase, a Pyridoxal 5'-Phosphate, and [2Fe-2S] Cluster-Containing Enzyme, Complexed with {Gamma}-Ethynyl-Gaba and with the Antiepilepsy Drug Vigabatrin

Storici, P.De Biase, D.Bossa, F.Bruno, S.Mozzarelli, A.Peneff, C.Silverman, R.Schirmer, T.

(2004) J.Biol.Chem. 279: 363

  • DOI: 10.1074/jbc.M305884200
  • Primary Citation of Related Structures:  1OHW, 1OHY

  • PubMed Abstract: 
  • Gamma-aminobutyric acid aminotransferase (GABA-AT) is a pyridoxal 5'-phosphate-dependent enzyme responsible for the degradation of the inhibitory neurotransmitter GABA. GABA-AT is a validated target for antiepilepsy drugs because its selective inhibi ...

    Gamma-aminobutyric acid aminotransferase (GABA-AT) is a pyridoxal 5'-phosphate-dependent enzyme responsible for the degradation of the inhibitory neurotransmitter GABA. GABA-AT is a validated target for antiepilepsy drugs because its selective inhibition raises GABA concentrations in brain. The antiepilepsy drug, gamma-vinyl-GABA (vigabatrin) has been investigated in the past by various biochemical methods and resulted in several proposals for its mechanisms of inactivation. In this study we solved and compared the crystal structures of pig liver GABA-AT in its native form (to 2.3-A resolution) and in complex with vigabatrin as well as with the close analogue gamma-ethynyl-GABA (to 2.3 and 2.8 A, respectively). Both inactivators form a covalent ternary adduct with the active site Lys-329 and the pyridoxal 5'-phosphate (PLP) cofactor. The crystal structures provide direct support for specific inactivation mechanisms proposed earlier on the basis of radio-labeling experiments. The reactivity of GABA-AT crystals with the two GABA analogues was also investigated by polarized absorption microspectrophotometry. The spectral data are discussed in relation to the proposed mechanism. Intriguingly, all three structures revealed a [2Fe-2S] cluster of yet unknown function at the center of the dimeric molecule in the vicinity of the PLP cofactors.


    Related Citations: 
    • Crystal Structure of Gaba-Aminotransferase, a Target for Antiepileptic Drug Therapy
      Storici, P.,Capitani, G.,De Biase, D.,Moser, M.,John, R.A.,Jansonius, J.N.,Schirmer, T.
      (1999) Biochemistry 38: 8628


    Organizational Affiliation

    Division of Structural Biology, Biozentrum, University of Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
4-AMINOBUTYRATE AMINOTRANSFERASE
A, B, C, D
472Sus scrofaGene Names: ABAT (GABAT)
EC: 2.6.1.22, 2.6.1.19
Find proteins for P80147 (Sus scrofa)
Go to Gene View: ABAT
Go to UniProtKB:  P80147
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B, C, D
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
FES
Query on FES

Download SDF File 
Download CCD File 
A, C
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
 Ligand Interaction
PLP
Query on PLP

Download SDF File 
Download CCD File 
A, B, C, D
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 68.597α = 90.00
b = 225.045β = 108.39
c = 70.349γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance