Erbin inhibits RAF activation by disrupting the Sur-8-Ras-Raf complex

Penggao Dai, Wen C. Xiong, Lin Mei

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83 Scopus citations


Erbin is a member of the LAP (leucine-rich repeat (LRR) and PDZ domain) family. It inhibits Ras-mediated activation of ERK in response to growth factors. In this study, we investigated the mechanisms by which Erbin regulates the Ras-Raf-MEK pathway. The N-terminal LRR domain was necessary and sufficient to inhibit neuregulin-activated expression of ε416-Luc, a reporter of ERK activation. On the other hand, Erbin had no effect on Ras activation, but it attenuated neuregulin-induced Raf activation, suggesting that Erbin may regulate Raf activation by Ras. Via the LRR domain, Erbin interacts with Sur-8, a scaffold protein necessary for the Ras-Raf complex. Expression of Erbin attenuated the interaction of Sur-8 with active Ras and Raf. Moreover, Erbin-shRNA, which suppressed Erbin expression at mRNA and protein levels, increased the interaction of Sur-8 with Ras and Raf, ERK activation, and neuregulin-induced expression of endogenous acetylcholine receptor ε-subunit mRNA. These results demonstrate a regulatory role of Erbin in the Ras-Raf-MEK pathway, suggesting that Erbin may inhibit ERK activation by disrupting the Sur-8-Ras/Raf interaction.

Original languageEnglish (US)
Pages (from-to)927-933
Number of pages7
JournalJournal of Biological Chemistry
Issue number2
StatePublished - Jan 13 2006
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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