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Accession information: (02)00439-8h.htm (shortcode: fig001wkg); 25 April 2002
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Schematic representation of the structure and phosphorylation of Raf-1

Walter Kolch, Ashwin Kotwaliwale, Keith Vass and Petra Janosch

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Figure 1. Schematic representation of the structure and phosphorylation of Raf-1. The three conserved regions (CR1–3) are shown: CR1 has a Ras-binding domain and a Cys-rich domain; CR2 is a Ser/Thr-rich domain; CR3 is required for kinase activity. The dotted line in CR1 indicates that the Cys-rich domain is not essential for Ras binding but is required for activation of Raf by Ras. Several kinases, including PAK (p21rac/cdc42-activated kinase), Src-family tyrosine kinases and as yet undefined kinases, phosphorylate Raf-1. Ser338 can be phosphorylated by PAK, and Tyr341 by Src. The phosphorylation sites (P) and their functions (when phosphorylated) are indicated. MEK, MAPK/ERK kinase (fig001wkg).

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