Critical contribution of linker proteins to Raf kinase activation

Anthony N. Anselmo, Ron Bumeister, Jackie M. Thomas, Michael A. White

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Genetic analysis of Ras signaling has unveiled the participation of non-enzymatic accessory proteins in signal transmission. These proteins, KSR, CNK, and Sur-8, can interact with multiple core components of the Ras/MAP kinase cascade and may contribute to the structural organization of this cascade. However, the precise biochemical nature of the contribution of these proteins to Ras signaling is currently unknown. Here we show directly that CNK and KSR are required for stimulus dependent Raf kinase activation. CNK is required for membrane recruitment of Raf, while KSR is likely required to couple Raf to upstream kinases. These results demonstrate that CNK and KSR are integral components of the cellular machinery mediating Raf activation.

Original languageEnglish (US)
Pages (from-to)5940-5943
Number of pages4
JournalJournal of Biological Chemistry
Issue number8
StatePublished - Feb 22 2002

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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