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Experimental Approaches for Biochemical Analysis of Glial Fibrillary Acidic Protein and Its Disease-associated Variants
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Structural determinants of GAD antigenicity.

Yasir Arafat1, Gustavo Fenalti, James C Whisstock

  • 1The Department of Biochemistry and Molecular Biology, Monash University, Clayton, Melbourne, VIC 3800, Australia.

Molecular Immunology
|September 29, 2009
PubMed
Summary

Structural differences in the C-terminal domain of glutamic acid decarboxylase 65 kDa isoform (GAD65) explain its autoantigenicity compared to GAD67. These features, linked to function, may predict other enzyme autoantigens.

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Area of Science:

  • Biochemistry
  • Immunology
  • Structural Biology

Background:

  • Autoantibodies to glutamic acid decarboxylase 65 kDa isoform (GAD65) are markers for type 1 diabetes and neurological autoimmune diseases.
  • GAD65 and GAD67 share high sequence identity and fold, yet GAD65 is autoantigenic while GAD67 is not.
  • Previous epitope mapping has not fully explained the differential autoantigenicity between GAD65 and GAD67.

Purpose of the Study:

  • To identify structural determinants underlying the autoantigenicity of GAD65 compared to GAD67.
  • To understand why GAD65-specific autoantibodies rarely cross-react with GAD67.

Main Methods:

  • Comparative analysis of recently determined crystal structures of GAD65 and GAD67.
  • Evaluation of structural, hydrophobicity, electrostatic, flexibility, and physiochemical properties.
  • Correlation of structural findings with published epitope-mapping data.

Main Results:

  • Striking structural differences were observed primarily in the C-terminal domains of GAD65 and GAD67.
  • GAD65 exhibits a highly charged and flexible C-terminal domain with significant electrostatic and solvation energies, absent in GAD67.
  • Potential N-terminal and PLP domain binding sites near GAD65's autoantigenic C-terminal region were identified, unlike in GAD67.

Conclusions:

  • The flexibility and charge of GAD65's C-terminal domain, coupled with catalytic loop mobility, are crucial for its enzymatic function and autoantigenicity.
  • Structural features distinguishing GAD65 as a B cell autoantigen are intrinsically linked to its functional requirements.
  • These findings may inform predictive strategies for other enzyme autoantigens.