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J Biol Chem, Vol. 274, Issue 47, 33684-33690, November 19, 1999

RIP2 Is a Raf1-activated Mitogen-activated Protein Kinase Kinase

Tony A. Navas, Daryl T. Baldwin^§, and Timothy A. Stewart

From the  Department of Endocrine Research and ^§ Department of Molecular Biology, Genentech, Inc., South San Francisco, California 94080

RIP2 is a serine-threonine kinase associated with the tumor necrosis factor (TNF) receptor complex and is implicated in the activation of NF-B and cell death in mammalian cells. However, the function of its kinase domain is still enigmatic as it is not required in engaging these responses. Here we show that RIP2 activates the extracellular signal-regulated kinase (ERK) pathway and that the kinase activity of RIP2 appears to be important in this process. RIP2 activates AP-1 and serum response element regulated expression by inducing the activation of the Elk1 transcription factor. RIP2 directly phosphorylates and activates ERK2 in vivo and in vitro. RIP2 in turn is activated through its interaction with Ras-activated Raf1. Kinase-defective point and deletion variants of RIP2 also significantly blocked the activation of ERK2 by TNF but not epidermal growth factor. These results describe a novel pathway of ERK activation and the first catalytic function ascribed to any of the RIP-like kinases associated with the TNF receptor superfamily.

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Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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