Expression and characterization of full-length human huntingtin, an elongated HEAT repeat protein |
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Authors: | Li Wei Serpell Louise C Carter Wendy J Rubinsztein David C Huntington James A |
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Institution: | Department of Haematology, University of Cambridge, Cambridge Institute for Medical Research, Cambridge CB2 2XY, United Kingdom. |
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Abstract: | Huntington disease is an inherited neurodegenerative disorder that is caused by expanded CAG trinucleotide repeats, resulting in a polyglutamine stretch of >37 on the N terminus of the protein huntingtin (htt). htt is a large (347 kDa), ubiquitously expressed protein. The precise functions of htt are not clear, but its importance is underscored by the embryonic lethal phenotype in htt knock-out mice. Despite the fact that the htt gene was cloned 13 years ago, little is known about the properties of the full-length protein. Here we report the expression and preliminary characterization of recombinant full-length wild-type human htt. Our results support a model of htt composed entirely of HEAT repeats that stack to form an elongated superhelix. |
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