کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1931880 1050568 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
SIAH-1 interacts with mammalian polyhomeotic homologues HPH2 and affects its stability via the ubiquitin–proteasome pathway
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
SIAH-1 interacts with mammalian polyhomeotic homologues HPH2 and affects its stability via the ubiquitin–proteasome pathway
چکیده انگلیسی

Polycomb Group (PcG) genes encode proteins that form large multimeric and chromatin-associated complexes implicated in the stable repression of developmentally essential genes. HPH2, the Homo sapiens polyhomeotic homologue 2, functions as one of the subunits of PcG complex 1. In our study, SIAH-1, an E3 ligase, could directly associate with HPH2 both in vitro and in vivo. Both the cysteine-rich region of SIAH-1 and the PxVxAxP motif of HPH2 were essential for the interaction. HPH2 was co-localized with SIAH-1 in nuclei. Furthermore, SIAH-1 was able to facilitate the ubiquitination and degradation of HPH2 via ubiquitin–proteasome pathway in vivo. The ubiquitination activity was severely impaired in the SIAH-1 mutant that either lost E3 ligase activity or had weakened binding ability with HPH2, strongly suggesting that SIAH-1 was the direct E3 ligase of HPH2. Thus, our results propose a novel role of SIAH-1 in regulating the expression level of HPH2 through the ubiquitin–proteasome pathway.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 397, Issue 3, 2 July 2010, Pages 391–396
نویسندگان
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