Sef is a spatial regulator for Ras/MAP kinase signaling

Satoru Torii, Morioh Kusakabe, Takuya Yamamoto, Momoko Maekawa, Eisuke Nishida

    Research output: Contribution to journalArticle

    226 Citations (Scopus)

    Abstract

    Spatiotemporal control of the Ras/ERK MAP kinase signaling pathway is among the key mechanisms for regulating a wide variety of cellular processes. In this study, we report that human Sef (hSef), a recently identified inhibitor whose action mechanism has not been fully defined, acts as a molecular switch for ERK signaling by specifically blocking ERK nuclear translocation without inhibiting its activity in the cytoplasm. Thus, hSef binds to activated forms of MEK, inhibits the dissociation of the MEK-ERK complex, and blocks nuclear translocation of activated ERK. Consequently, hSef inhibits phosphorylation and activation of the nuclear ERK substrate Elk-1, while it does not affect phosphorylation of the cytoplasmic ERK substrate RSK2. Downregulation of endogenous hSef by hSef siRNA enhances the stimulus-induced ERK nuclear translocation and the activity of Elk-1. These results thus demonstrate that hSef acts as a spatial regulator for ERK signaling by targeting ERK to the cytoplasm.

    Original languageEnglish
    Pages (from-to)33-44
    Number of pages12
    JournalDevelopmental cell
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2004 Jul 1

    ASJC Scopus subject areas

    • Molecular Biology
    • Biochemistry, Genetics and Molecular Biology(all)
    • Developmental Biology
    • Cell Biology

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  • Cite this

    Torii, S., Kusakabe, M., Yamamoto, T., Maekawa, M., & Nishida, E. (2004). Sef is a spatial regulator for Ras/MAP kinase signaling. Developmental cell, 7(1), 33-44. https://doi.org/10.1016/j.devcel.2004.05.019