Ajuba phosphorylation by CDK1 promotes cell proliferation and tumorigenesis

Xingcheng Chen, Seth Stauffer, Yuanhong Chen, Jixin Dong

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Recent studies identified the adaptor protein Ajuba as a positive regulator of Yes-associated protein (YAP) oncogenic activity through inhibiting large tumor suppressor (Lats1/2) core kinases of the Hippo pathway, a signaling pathway that plays important roles in cancer. In this study, we define a novel mechanism for phospho-regulation of Ajuba in mitosis and its biological significance in cancer. We found that Ajuba is phosphorylated in vitro and in vivo by cyclin-dependent kinase 1 (CDK1) at Ser119 and Ser175 during the G2/M phase of the cell cycle. Mitotic phosphorylation of Ajuba controls the expression of multiple cell cycle regulators; however, it does not affect Hippo signaling activity, nor does it induce epithelial-mesenchymal transition. We further showed that mitotic phosphorylation of Ajuba is sufficient to promote cell proliferation and anchorage- independent growth in vitro and tumorigenesis in vivo. Collectively, our discoveries reveal a previously unrecognized mechanism for Ajuba regulation in mitosis and its role in tumorigenesis.

Original languageEnglish (US)
Pages (from-to)14761-14772
Number of pages12
JournalJournal of Biological Chemistry
Volume291
Issue number28
DOIs
StatePublished - Jul 8 2016

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CDC2 Protein Kinase
Phosphorylation
Cell proliferation
Carcinogenesis
Cells
Cell Proliferation
Mitosis
Cell Cycle
Tumors
Neoplasms
Proteins
Epithelial-Mesenchymal Transition
Phosphotransferases
G2 Phase
Cell Division
Growth
In Vitro Techniques

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Ajuba phosphorylation by CDK1 promotes cell proliferation and tumorigenesis. / Chen, Xingcheng; Stauffer, Seth; Chen, Yuanhong; Dong, Jixin.

In: Journal of Biological Chemistry, Vol. 291, No. 28, 08.07.2016, p. 14761-14772.

Research output: Contribution to journalArticle

Chen, Xingcheng ; Stauffer, Seth ; Chen, Yuanhong ; Dong, Jixin. / Ajuba phosphorylation by CDK1 promotes cell proliferation and tumorigenesis. In: Journal of Biological Chemistry. 2016 ; Vol. 291, No. 28. pp. 14761-14772.
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