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XB-ART-3674
J Biol Chem 2004 Jun 25;27926:27807-15. doi: 10.1074/jbc.M401210200.
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Cation diffusion facilitator proteins modulate Raf-1 activity.

Jirakulaporn T , Muslin AJ .


Abstract
The Ras-extracellular signal-regulated kinase (ERK) cascade is a critical intracellular signaling pathway that regulates growth, survival, and differentiation. Previous work established that Ras-GTP binds to, and facilitates the activation of, the protein kinase Raf-1. Recently, it was demonstrated that the cation diffusion facilitator (CDF) proteins are involved in Ras-ERK signaling by use of a Caenorhabditis elegans genetic screen that identified suppressors of activated Ras. In the current work, we demonstrate that CDF proteins may function downstream of Ras, but upstream of Raf-1 in Xenopus oocytes. We also show that the C. elegans protein CDF-1 and its mammalian homologue ZnT-1 bind to the amino-terminal regulatory portion of Raf-1 and promote the biological and enzymatic activity of Raf-1. Furthermore, we show that Zn(2+) inhibits Raf-1 binding to ZnT-1. We propose a model in which CDF protein binding facilitates Raf-1 activation.

PubMed ID: 15096503
Article link: J Biol Chem
Grant support: [+]

Species referenced: Xenopus
Genes referenced: lif mapk1 raf1