کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8961814 | 1646520 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
E3 ubiquitin ligase HECW2 mediates the proteasomal degradation of HP1 isoforms
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
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چکیده انگلیسی
Heterochromatin protein 1 (HP1) isoforms are conserved non-histone chromatin-binding proteins that play an important role in packaging of heterochromatin and gene regulation. The functions of HP1 isoforms α and β are influenced by the nuclear lamins. Cells expressing disease-causing lamin A rod domain mutants show depletion of HP1α and β and E3 ubiquitin ligase HECW2 is upregulated in these cells. However, the role of HECW2 in the turnover of HP1 proteins has been hitherto unexplored. Here, we show that HECW2 interacts with HP1 isoforms α and β but not HP1γ. Ectopic expression of HECW2 causes the ubiquitination of HP1α and β, thereby targeting them for proteasomal degradation. Downregulation of HECW2 increases their steady-state levels indicating its role in their homeostatic regulation. Our results give important insights into the mechanism of proteasomal degradation of HP1 proteins in laminopathic cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 503, Issue 4, 18 September 2018, Pages 2478-2484
Journal: Biochemical and Biophysical Research Communications - Volume 503, Issue 4, 18 September 2018, Pages 2478-2484
نویسندگان
Vidhya Krishnamoorthy, Richa Khanna, Veena K. Parnaik,