Abstract：
:Adipocyte differentiation is a strictly controlled process regulated by a series of transcriptional activators. Adipogenic signals activate early adipogenic activators and facilitate the transient formation of early enhanceosomes at target genes. These enhancer regions are subsequently inherited by late enhanceosomes. PPARγ is one of the late adipogenic activators and is known as a master regulator of adipogenesis. However, the factors that regulate PPARγ expression remain to be elucidated. Here, we show that a novel ubiquitin E3 ligase, tripartite motif protein 23 (TRIM23), stabilizes PPARγ protein and mediates atypical polyubiquitin conjugation. TRIM23 knockdown caused a marked decrease in PPARγ protein abundance during preadipocyte differentiation, resulting in a severe defect in late adipogenic differentiation, whereas it did not affect the formation of early enhanceosomes. Our results suggest that TRIM23 plays a critical role in the switching from early to late adipogenic enhanceosomes by stabilizing PPARγ protein possibly via atypical polyubiquitin conjugation.
journal_name
Elifejournal_title
eLifeauthors
Watanabe M,Takahashi H,Saeki Y,Ozaki T,Itoh S,Suzuki M,Mizushima W,Tanaka K,Hatakeyama Sdoi
10.7554/eLife.05615subject
Has Abstractpub_date
2015-04-23 00:00:00pages
e05615issn
2050-084Xjournal_volume
4pub_type
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