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

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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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: https://doi.org/10.1042/BSR20120111
  • Primary Citation of Related Structures:  

  • 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-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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutamate decarboxylase 1
A, B
511Homo sapiensMutation(s): 0 
Gene Names: GAD1
UniProt & NIH Common Fund Data Resources
Find proteins for Q99259 (Homo sapiens)
Explore Q99259 
Go to UniProtKB:  Q99259
GTEx:  ENSG00000128683 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99259
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • 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
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

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