GABA production by glutamic acid decarboxylase is regulated by a dynamic catalytic loop.
Fenalti, G., Law, R.H., Buckle, A.M., Langendorf, C., Tuck, K., Rosado, C.J., Faux, N.G., Mahmood, K., Hampe, C.S., Banga, J.P., Wilce, M., Schmidberger, J., Rossjohn, J., El-Kabbani, O., Pike, R.N., Smith, A.I., Mackay, I.R., Rowley, M.J., Whisstock, J.C.(2007) Nat Struct Mol Biol 14: 280-286
- PubMed: 17384644 
- DOI: 10.1038/nsmb1228
- Primary Citation of Related Structures:  
2OKJ, 2OKK - PubMed Abstract: 
Gamma-aminobutyric acid (GABA) is synthesized by two isoforms of the pyridoxal 5'-phosphate-dependent enzyme glutamic acid decarboxylase (GAD65 and GAD67). GAD67 is constitutively active and is responsible for basal GABA production. In contrast, GAD65, an autoantigen in type I diabetes, is transiently activated in response to the demand for extra GABA in neurotransmission, and cycles between an active holo form and an inactive apo form ...