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SUMO modification of Huntingtin and Huntington's disease pathology | | Joan S Steffan
; Namita Agrawal
; Judit Pallos
; Erica Rockabr
; Lloyd C Trotman
; Natalia Slepko
; Katalin Illes
; Tamas Lukacsovich
; Ya-Zhen Zhu
; Elena Cattaneo
; Pier Paolo Pandolfi
; Leslie Michels Thompson
; J Lawrence Marsh
; | | Date: |
2 Apr 2004 | | Journal: | Science, 304 (5667), 100-4 | | Abstract: | Huntington’s disease (HD) is characterized by the accumulation of a pathogenic protein, Huntingtin (Htt), that contains an abnormal polyglutamine expansion. Here, we report that a pathogenic fragment of Htt (Httex1p) can be modified either by small ubiquitin-like modifier (SUMO)-1 or by ubiquitin on identical lysine residues. In cultured cells, SUMOylation stabilizes Httex1p, reduces its ability to form aggregates, and promotes its capacity to repress transcription. In a Drosophila model of HD, SUMOylation of Httex1p exacerbates neurodegeneration, whereas ubiquitination of Httex1p abrogates neurodegeneration. Lysine mutations that prevent both SUMOylation and ubiquitination of Httex1p reduce HD pathology, indicating that the contribution of SUMOylation to HD pathology extends beyond preventing Htt ubiquitination and degradation. | | Source: | PubMed, pmid15064418 doi: 10.1126/science.1092194 | | Services: | Forum | Review | Favorites | |
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