Ubiquitin ligase SPSB4 diminishes cell repulsive responses mediated by EphB2

Fumihiko Okumura, Akiko Joo-Okumura, Keisuke Obara, Alexander Petersen, Akihiko Nishikimi, Yoshinori Fukui, Kunio Nakatsukasa, Takumi Kamura

研究成果: ジャーナルへの寄稿学術誌査読

8 被引用数 (Scopus)

抄録

Eph receptor tyrosine kinases and their ephrin ligands are overexpressed in various human cancers, including colorectal malignancies, suggesting important roles in many aspects of cancer development and progression as well as in cellular repulsive responses. The ectodomain of EphB2 receptor is cleaved by metalloproteinases (MMPs) MMP-2/MMP-9 and released into the extracellular space after stimulation by its ligand. The remaining membraneassociated fragment is further cleaved by the presenilin-dependent γ-secretase and releases an intracellular peptide that has tyrosine kinase activity. Although the cytoplasmic fragment is degraded by the proteasome, the responsible ubiquitin ligase has not been identified. Here, we show that SOCS box-containing protein SPSB4 polyubiquitinates EphB2 cytoplasmic fragment and that SPSB4 knockdown stabilizes the cytoplasmic fragment. Importantly, SPSB4 down-regulation enhances cell repulsive responses mediated by EphB2 stimulation. Altogether, we propose that SPSB4 is a previously unidentified ubiquitin ligase regulating EphB2-dependent cell repulsive responses.

本文言語英語
ページ(範囲)3532-3541
ページ数10
ジャーナルMolecular biology of the cell
28
24
DOI
出版ステータス出版済み - 11月 15 2017

!!!All Science Journal Classification (ASJC) codes

  • 分子生物学
  • 細胞生物学

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