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Spironolactone‐induced XPB degradation depends on CDK7 kinase and SCFFBXL18 E3 ligase

Ueda, Masanobu ; Matsuura, Kenkyo ; Kawai, Hidehiko ; Wakasugi, Mitsuo ; Matsunaga, Tsukasa

Genes to cells : devoted to molecular & cellular mechanisms, 2019-04, Vol.24 (4), p.284-296 [Periódico revisado por pares]

Tokyo: Wiley Subscription Services, Inc

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  • Título:
    Spironolactone‐induced XPB degradation depends on CDK7 kinase and SCFFBXL18 E3 ligase
  • Autor: Ueda, Masanobu ; Matsuura, Kenkyo ; Kawai, Hidehiko ; Wakasugi, Mitsuo ; Matsunaga, Tsukasa
  • Assuntos: Aldosterone ; Cancer ; CDK7 ; Cyclin-dependent kinase 7 ; Cytotoxicity ; Kinases ; Nucleotide excision repair ; Phosphorylation ; Platinum ; Proteasomes ; SCFFBXL18 ; siRNA ; spironolactone ; TFIIH ; Ubiquitin-protein ligase ; ubiquitin‐proteasome system ; XPB ; XPD protein
  • É parte de: Genes to cells : devoted to molecular & cellular mechanisms, 2019-04, Vol.24 (4), p.284-296
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The multisubunit complex transcription factor IIH (TFIIH) has dual functions in transcriptional initiation and nucleotide excision repair (NER). TFIIH is comprised of two subcomplexes, the core subcomplex (seven subunits) including XPB and XPD helicases and the cyclin‐dependent kinase (CDK)‐activating kinase (CAK) subcomplex (three subunits) containing CDK7 kinase. Recently, it has been reported that spironolactone, an anti‐aldosterone drug, inhibits cellular NER by inducing proteasomal degradation of XPB and potentiates the cytotoxicity of platinum‐based drugs in cancer cells, suggesting possible drug repositioning. In this study, we have tried to uncover the mechanism underlying the chemical‐induced XPB destabilization. Based on siRNA library screening and subsequent analyses, we identified SCFFBXL18 E3 ligase consisting of Skp1, Cul1, F‐box protein FBXL18 and Rbx1 responsible for spironolactone‐induced XPB polyubiquitination and degradation. In addition, we showed that CDK7 kinase activity is required for this process. Finally, we found that the Ser90 residue of XPB is essential for the chemical‐induced destabilization. These results led us to propose a model that spironolactone may trigger the phosphorylation of XPB at Ser90 by CDK7, which promotes the recognition and polyubiquitination of XPB by SCFFBXL18 for proteasomal degradation. It has been known that spironolactone, an anti‐aldosterone drug, inhibits cellular NER by inducing proteasomal degradation of XPB and potentiates the cytotoxicity of platinum‐based drugs in cancer cells. In this study, we propose a mechanistic model that spironolactone may trigger the phosphorylation of XPB at Ser90 by CDK7, which promotes the recognition and K48‐linked polyubiquitination of XPB by SCFFBXL18 for proteasomal degradation.
  • Editor: Tokyo: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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