3VP6

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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
  • Primary Citation of Related Structures:  
    3VP6

  • 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 auto-i ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutamate decarboxylase 1 AB511Homo sapiensMutation(s): 0 
Gene Names: GAD1GADGAD67
EC: 4.1.1.15
Find proteins for Q99259 (Homo sapiens)
Explore Q99259 
Go to UniProtKB:  Q99259
NIH Common Fund Data Resources
PHAROS:  Q99259
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HLD
Query on HLD

Download Ideal Coordinates 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 Ideal Coordinates CCD File 
B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
A,BL-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.006α = 90
b = 64.084β = 108.14
c = 102.646γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
BUSTERrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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