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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Isolation of a 40-kDa Huntingtin-associated protein.

Huntington's disease is caused by an expanded CAG trinucleotide repeat coding for a polyglutamine stretch within the huntingtin protein. Currently, the function of normal huntingtin and the mechanism by which expanded huntingtin causes selective neurotoxicity remain unknown. Clues may come from the identification of huntingtin-associated proteins (HAPs). Here, we show that huntingtin copurifies with a single novel 40-kDa protein termed HAP40. HAP40 is encoded by the open reading frame factor VIII-associated gene A (F8A) located within intron 22 of the factor VIII gene. In transfected cell extracts, HAP40 coimmunoprecipitates with full-length huntingtin but not with an N-terminal huntingtin fragment. Recombinant HAP40 is cytoplasmic in the presence of huntingtin but is actively targeted to the nucleus in the absence of huntingtin. These data indicate that HAP40 is likely to contribute to the function of normal huntingtin and is a candidate for involvement in the aberrant nuclear localization of mutant huntingtin found in degenerating neurons in Huntington's disease.[1]

References

  1. Isolation of a 40-kDa Huntingtin-associated protein. Peters, M.F., Ross, C.A. J. Biol. Chem. (2001) [Pubmed]
 
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