2okj: Difference between revisions

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[[Image:2okj.gif|left|200px]]
{{Seed}}
[[Image:2okj.png|left|200px]]


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{{STRUCTURE_2okj|  PDB=2okj  |  SCENE=  }}  
{{STRUCTURE_2okj|  PDB=2okj  |  SCENE=  }}  


'''The X-ray crystal structure of the 67kDa isoform of Glutamic Acid Decarboxylase (GAD67)'''
===The X-ray crystal structure of the 67kDa isoform of Glutamic Acid Decarboxylase (GAD67)===




==Overview==
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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. We have determined the crystal structures of N-terminal truncations of both GAD isoforms. The structure of GAD67 shows a tethered loop covering the active site, providing a catalytic environment that sustains GABA production. In contrast, the same catalytic loop is inherently mobile in GAD65. Kinetic studies suggest that mobility in the catalytic loop promotes a side reaction that results in cofactor release and GAD65 autoinactivation. These data reveal the molecular basis for regulation of GABA homeostasis.
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{{ABSTRACT_PUBMED_17384644}}


==About this Structure==
==About this Structure==
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[[Category: Whisstock, J C.]]
[[Category: Whisstock, J C.]]
[[Category: Plp-dependent decarboxylase]]
[[Category: Plp-dependent decarboxylase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 11:06:05 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:41:11 2008''

Revision as of 08:41, 28 July 2008

File:2okj.png

Template:STRUCTURE 2okj

The X-ray crystal structure of the 67kDa isoform of Glutamic Acid Decarboxylase (GAD67)

Template:ABSTRACT PUBMED 17384644

About this Structure

2OKJ is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

GABA production by glutamic acid decarboxylase is regulated by a dynamic catalytic loop., Fenalti G, Law RH, Buckle AM, Langendorf C, Tuck K, Rosado CJ, Faux NG, Mahmood K, Hampe CS, Banga JP, Wilce M, Schmidberger J, Rossjohn J, El-Kabbani O, Pike RN, Smith AI, Mackay IR, Rowley MJ, Whisstock JC, Nat Struct Mol Biol. 2007 Apr;14(4):280-6. Epub 2007 Mar 25. PMID:17384644

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