Ras-activated RSK1 phosphorylates EBP50 to regulate its nuclear localization and promote cell proliferation
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HooiCheng Lim1 and Tzuu-Shuh Jou1,2
1 Graduate Institute of Molecular Medicine, National Taiwan University, Taipei, Taiwan
2 Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
Tzuu-Shuh Jou, email:
Keywords: EBP50, nuclear localization, phosphorylation, proliferation, RSK1
Received: November 23, 2015 Accepted: January 25, 2016 Published: March 01, 2016
Differential subcellular localization of EBP50 leads to its controversial role in cancer biology either as a tumor suppressor when it resides at the membrane periphery, or a tumor facilitator at the nucleus. However, the mechanism behind nuclear localization of EBP50 remains unclear. A RNA interference screening identified the downstream effector of the Ras-ERK cascade, RSK1, as the molecule unique for nuclear transport of EBP50. RSK1 binds to EBP50 and phosphorylates it at a conserved threonine residue at position 156 (T156) under the regulation of growth factor. Mutagenesis experiments confirmed the significance of T156 residue in nuclear localization of EBP50, cellular proliferation, and oncogenic transformation. Our study sheds light on a possible therapeutic strategy targeting at this aberrant nuclear expression of EBP50 without affecting the normal physiological function of EBP50 at other subcellular localization.
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