Heat shock protein 90 stabilizes nucleolin to increase mRNA stability in mitosis

Shao An Wang, Hao Yi Li, Tsung I. Hsu, Shu Hui Chen, Chin Jen Wu, Wen Chang Chang, Jan Jong Hung

研究成果: 雜誌貢獻文章同行評審

30 引文 斯高帕斯(Scopus)


Most studies on heat shock protein 90 (Hsp90) have focused on the involvement of Hsp90 in the interphase, whereas the role of this protein in the nucleus during mitosis remains largely unclear. In this study, we found that the level of the acetylated form of Hsp90 decreased dramatically during mitosis, which indicates more chaperone activity during mitosis. We thus probed proteins that interacted with Hsp90 by liquid chromatography/mass spectrometry (LC/MS) and found that nucleolin was one of those interacting proteins during mitosis. The nucleolin level decreased upon geldanamycin treatment, and Hsp90 maintained the cyclin-dependent kinase 1 (CDK1) activity to phosphorylate nucleolin at Thr-641/707. Mutation of Thr-641/707 resulted in the destabilization of nucleolin in mitosis. We globally screened the level of mitotic mRNAs and found that 229 mRNAs decreased during mitosis in the presence of geldanamycin. Furthermore, a bioinformatics tool and an RNA immunoprecipitation assay found that 16 mRNAs, including cadherin and Bcl-xl, were stabilized through the recruitment of nucleolin to the 3′-untranslated regions (3′-UTRs) of those genes. Overall, strong correlations exist between the up-regulation of Hsp90, nucleolin, and the mRNAs related to tumorigenesis of the lung. Our findings thus indicate that nucleolin stabilized by Hsp90 contributes to the lung tumorigenesis by increasing the level of many tumor-related mRNAs during mitosis.
頁(從 - 到)43816-43829
期刊Journal of Biological Chemistry
出版狀態已發佈 - 12月 23 2011

ASJC Scopus subject areas

  • 生物化學
  • 分子生物學
  • 細胞生物學


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