Polyglutamine domains are substrates of tissue transglutaminase: does transglutaminase play a role in expanded CAG/poly-Q neurodegenerative diseases?
Huntington's disease and six other neurodegenerative diseases are associated with abnormal gene products containing expanded polyglutamine (poly-Q; Qn) domains (n > or = 40). In the present work, we show that glutathione S-transferase (GST) fusion proteins containing a small, physiological-length poly-Q domain (GSTQ10) or a large, pathological-length poly-Q domain (GSTQ62) are excellent substrates of guinea pig liver (tissue) transglutaminase and that both GSTQ10 and GSTQ62 are activators of tissue transglutaminase-catalyzed hydroxaminolysis of N-alpha-carbobenzoxyglutaminylglycine. The present findings have implications for understanding the pathophysiological mechanisms of expanded CAG/poly-Q domain diseases.
Cooper, AJ; Sheu, KF; Burke, JR; Onodera, O; Strittmatter, WJ; Roses, AD; Blass, JP
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