3VP6

Structural characterization of Glutamic Acid Decarboxylase; insights into the mechanism of autoinactivation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural characterization of the mechanism through which human glutamic acid decarboxylase auto-activates

Langendorf, C.G.Tuck, K.L.Key, T.L.G.Fenalti, G.Pike, R.N.Rosado, C.J.Wong, A.S.M.Buckle, A.M.Law, R.H.P.Whisstock, J.C.

(2013) Biosci.Rep. 33: 137-144

  • DOI: 10.1042/BSR20120111

  • PubMed Abstract: 
  • Imbalances in GABA (γ-aminobutyric acid) homoeostasis underlie psychiatric and movement disorders. The ability of the 65 kDa isoform of GAD (glutamic acid decarboxylase), GAD65, to control synaptic GABA levels is influenced through its capacity to au ...

    Imbalances in GABA (γ-aminobutyric acid) homoeostasis underlie psychiatric and movement disorders. The ability of the 65 kDa isoform of GAD (glutamic acid decarboxylase), GAD65, to control synaptic GABA levels is influenced through its capacity to auto-inactivate. In contrast, the GAD67 isoform is constitutively active. Previous structural insights suggest that flexibility in the GAD65 catalytic loop drives enzyme inactivation. To test this idea, we constructed a panel of GAD65/67 chimaeras and compared the ability of these molecules to auto-inactivate. Together, our data reveal the important finding that the C-terminal domain of GAD plays a key role in controlling GAD65 auto-inactivation. In support of these findings, we determined the X-ray crystal structure of a GAD65/67 chimaera that reveals that the conformation of the catalytic loop is intimately linked to the C-terminal domain.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Monash University, Clayton, Melbourne, VIC 3800, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate decarboxylase 1
A, B
511Homo sapiensGene Names: GAD1 (GAD, GAD67)
EC: 4.1.1.15
Find proteins for Q99259 (Homo sapiens)
Go to Gene View: GAD1
Go to UniProtKB:  Q99259
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HLD
Query on HLD

Download SDF File 
Download CCD File 
A, B
4-oxo-4H-pyran-2,6-dicarboxylic acid
C7 H4 O6
PBAYDYUZOSNJGU-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
A, B
L-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 86.006α = 90.00
b = 64.084β = 108.14
c = 102.646γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-01-16
    Type: Initial release
  • Version 1.1: 2013-08-14
    Type: Database references