DYRK1A stabilizes HPV16E7 oncoprotein through phosphorylation of the threonine 5 and threonine 7 residues

Yuh Jin Liang, Hung Shu Chang, Chen Yu Wang, Winston C Y Yu

研究成果: 雜誌貢獻文章同行評審

23 引文 斯高帕斯(Scopus)

摘要

HPV16, a high-risk tumorigenic virus, has been identified as one of the causative agents for the development of cervical cancer. Subsequent to viral infection, the constitutive expression of the viral oncoproteins E6 and E7 plays a number of critical roles in maintaining the transformed phenotype. Here we demonstrate that a cellular kinase, dual-specificity tyrosine phosphorylation-regulated kinase 1A (DYRK1A), interacts with and phosphorylates HPV16E7 in vitro and in vivo. Using substitution mutations, we identified that DYRK1A specifically phosphorylates HPV16E7 at Thr5 and Thr7, which are located within the N-terminal CRI domain. This interaction greatly increases the steady-state level of HPV-16E7 by interfering with the protein's 26S proteosome-dependent degradation. The half-life of E7 was extended significantly by replacing Thr5 and Thr7 with a phosphorylation mimetic residue, aspartic acid. In addition, DYRK1A-induced phosphorylation protected E7 from degradation and influenced E7's function when modulating pRb degradation. We propose a new mechanism whereby DYRK1A phosphorylates Thr5 and Thr7 within HPV16E7. This phosphorylation then interferes with the degradation of HPV16E7, extending the protein half-life of HPV16E7 and increasing the colony-formation efficacy of HPV16E7. Our findings suggest that DYRK1A increases the transforming potential of HPV16-infected cells because of the greater stability of HPV16E7.
原文英語
頁(從 - 到)2431-2441
頁數11
期刊International Journal of Biochemistry and Cell Biology
40
發行號11
DOIs
出版狀態已發佈 - 2008
對外發佈

ASJC Scopus subject areas

  • 生物化學
  • 細胞生物學

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