MERTK mediated novel site Akt phosphorylation alleviates SAV1 suppression

Yao Jiang, Yanqiong Zhang, Janet Y. Leung, Cheng Fan, Konstantin I. Popov, Siyuan Su, Jiayi Qian, Xiaodong Wang, Alisha Holtzhausen, Eric Ubil, Yang Xiang, Ian Davis, Nikolay V. Dokholyan, Gang Wu, Charles M. Perou, William Y. Kim, H. Shelton Earp, Pengda Liu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Akt plays indispensable roles in cell proliferation, survival and metabolism. Mechanisms underlying posttranslational modification-mediated Akt activation have been extensively studied yet the Akt interactome is less understood. Here, we report that SAV1, a Hippo signaling component, inhibits Akt, a function independent of its role in Hippo signaling. Binding to a proline-tyrosine motif in the Akt-PH domain, SAV1 suppresses Akt activation by blocking Akt’s movement to plasma membrane. We further identify cancer-associated SAV1 mutations with impaired ability to bind Akt, leading to Akt hyperactivation. We also determine that MERTK phosphorylates Akt1-Y26, releasing SAV1 binding and allowing Akt responsiveness to canonical PI-3K pathway activation. This work provides a mechanism underlying MERTK-mediated Akt activation and survival signaling in kidney cancer. Akt activation drives oncogenesis and therapeutic resistance; this mechanism of Akt regulation by MERTK/SAV1 provides yet another complexity in an extensively studied pathway, and may yield prognostic information and therapeutic targets.

Original languageEnglish (US)
Article number1515
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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