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F-box only protein 9 is an E3 ubiquitin ligase of PPARγ
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Type
Academic journal
Author
Journal
KOREAN SOCIETY OF MEDICAL BIOCHEMISTRY AND MOLECULAR BIOLOGY Experimental and Molecular Medicine Experimental and Molecular Medicine 제48권 KCI Accredited Journals SCI
Published
2016.1
Pages
1 - 8 (8page)

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F-box only protein 9 is an E3 ubiquitin ligase of PPARγ
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Peroxisome proliferator-activated receptor gamma (PPARγ) is a critical regulator of carbohydrate and lipid metabolism, adipocyte differentiation and inflammatory response. Post-translational modification of PPARγ and its degradation involve several pathways, including the ubiquitin–proteasome system. Here, we identified F-box only protein 9 (FBXO9) as an E3 ubiquitin ligase of PPARγ. We screened interacting partners of PPARγ using immunoprecipitation and mass spectrometric analysis and identified FBXO9 as an E3 ubiquitin ligase of PPARγ. FBXO9 directly interacted with PPARγ through the activation function-1 domain and ligand-binding domain. FBXO9 decreased the protein stability of PPARγ through induction of ubiquitination. We found that the F-box motif of FBXO9 was required for its ubiquitination function. The activity of PPARγ was significantly decreased by FBXO9 overexpression. Furthermore, FBXO9 overexpression in 3T3-L1 adipocytes resulted in decreased levels of endogenous PPARγ and suppression of adipogenesis. These results suggest that FBXO9 is an important enzyme that regulates the stability and activity of PPARγ through ubiquitination.

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