Hypothesis: huntingtin may function in membrane association and vesicular traffickingThis paper is one of a selection of papers published in this Special Issue, entitled CSBMCB — Membrane Proteins in Health and Disease.

Ray Truant; Randy Atwal; Anjee Burtnik

doi:10.1139/o06-181

journal article Dec 01, 2006

Hypothesis: huntingtin may function in membrane association and vesicular traffickingThis paper is one of a selection of papers published in this Special Issue, entitled CSBMCB — Membrane Proteins in Health and Disease.

Ray Truant Randy Atwal Anjee Burtnik

Biochemistry and Cell Biology Vol. 84 No. 6 pp. 912-917 · Canadian Science Publishing

View at Publisher Save 10.1139/o06-181

Abstract

Huntington’s disease is a progressive neurodegenerative genetic disorder that is caused by a CAG triplet-repeat expansion in the first exon of the IT15 gene. This CAG expansion results in polyglutamine expansion in the 350 kDa huntingtin protein. The exact function of huntingtin is unknown. Understanding the pathological triggers of mutant huntingtin, and distinguishing the cause of disease from downstream effects, is critical to designing therapeutic strategies and defining long- and short-term goals of therapy. Many studies that have sought to determine the functions of huntingtin by determining huntingtin’s protein–protein interactions have been published. Through these studies, huntingtin has been seen to interact with a large number of proteins, and is likely a scaffolding protein for protein–protein interactions. Recently, using imaging, integrative proteomics, and cell biology, huntingtin has been defined as a membrane-associated protein, with activities related to axonal trafficking of vesicles and mitochondria. These functions have also been attributed to some huntingtin-interacting proteins. Additionally, discoveries of a membrane association domain and a palmitoylation site in huntingtin reinforce the fact that huntingtin is membrane associated. In Huntington’s disease mouse and fly models, axonal vesicle trafficking is inhibited, and lack of proper uptake of neurotrophic factors may be an important pathological trigger leading to striatal cell death in Huntington’s disease. Here we discuss recent advances from many independent groups and methodologies that are starting to resolve the elusive function of huntingtin in vesicle transport, and evidence that suggests that huntingtin may be directly involved in membrane interactions.

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Details

Published: Dec 01, 2006
Vol/Issue: 84(6)
Pages: 912-917
License: View

Authors

R

Ray Truant

McMaster University. Department of Biochemistry and Biomedical Sciences. HSC4H24A, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada.

R

Randy Atwal

McMaster University. Department of Biochemistry and Biomedical Sciences. HSC4H24A, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada.

A

Anjee Burtnik

McMaster University. Department of Biochemistry and Biomedical Sciences. HSC4H24A, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada.

Cite This Article

Ray Truant, Randy Atwal, Anjee Burtnik (2006). Hypothesis: huntingtin may function in membrane association and vesicular traffickingThis paper is one of a selection of papers published in this Special Issue, entitled CSBMCB — Membrane Proteins in Health and Disease.. Biochemistry and Cell Biology, 84(6), 912-917. https://doi.org/10.1139/o06-181

Hypothesis: huntingtin may function in membrane association and vesicular traffickingThis paper is one of a selection of papers published in this Special Issue, entitled CSBMCB — Membrane Proteins in Health and Disease.

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