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Mutant protein in Huntington disease is resistant to proteolysis in affected brain

Mutant protein in Huntington disease is resistant to proteolysis in affected brain The cause of Huntington disease pathophysiology is unknown, but a major hypothesis suggests that toxicity arises from the cleavage and accumulation of amino-terminal fragments containing an expanded polyglutamine region. In evaluating huntingtin protein (HD) from human brain, transgenic animals and cells, we observed, unexpectedly, that mutant HD is more resistant to proteolysis than normal HD. The N-terminal cleavage fragments we observed arise from the processing of normal HD and are sequestered by full-length mutant HD. Our results support a model in which inhibition of proteolysis of mutant HD leads to aggregation and toxicity through the sequestering of important targets, including normal HD. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Genetics Springer Journals

Mutant protein in Huntington disease is resistant to proteolysis in affected brain

Nature Genetics , Volume 29 (3) – Oct 15, 2001

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References (50)

Publisher
Springer Journals
Copyright
Copyright © 2001 by Nature Publishing Group
Subject
Biomedicine; Biomedicine, general; Human Genetics; Cancer Research; Agriculture; Gene Function; Animal Genetics and Genomics
ISSN
1061-4036
eISSN
1546-1718
DOI
10.1038/ng745
Publisher site
See Article on Publisher Site

Abstract

The cause of Huntington disease pathophysiology is unknown, but a major hypothesis suggests that toxicity arises from the cleavage and accumulation of amino-terminal fragments containing an expanded polyglutamine region. In evaluating huntingtin protein (HD) from human brain, transgenic animals and cells, we observed, unexpectedly, that mutant HD is more resistant to proteolysis than normal HD. The N-terminal cleavage fragments we observed arise from the processing of normal HD and are sequestered by full-length mutant HD. Our results support a model in which inhibition of proteolysis of mutant HD leads to aggregation and toxicity through the sequestering of important targets, including normal HD.

Journal

Nature GeneticsSpringer Journals

Published: Oct 15, 2001

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