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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

In vivo interaction of AF-6 with activated Ras and ZO-1.

AF-6 contains two putative Ras- associating domains (RA domains) which are seen in several Ras effectors such as RalGDS and RIN1. We previously showed that an AF-6 fragment containing the amino-terminal (N-terminal) RA domain directly binds to activated Ras and ZO-1 in vitro. In this study, we showed that a single amino acid mutation in the N-terminal RA domain of AF-6 abolished the interaction of AF-6 with activated Ras and that the sites of this critical amino acid residue were similar to those for Raf-1 and RalGDS. The overexpression of the N-terminal RA domain of AF-6 inhibited the Ras-dependent c-fos promoter/enhancer stimulation in NIH3T3 cells. Endogenous AF-6 was coimmunoprecipitated with activated Ras from Rat1 cells expressing activated Ras. Moreover, we showed that AF-6 was coimmunoprecipitated with ZO-1 from Rat1 cells. Taken together, these results indicate that the Ras-interacting region on AF-6 is structurally similar to that on Raf-1 and on RalGDS and that AF-6 interacts with activated Ras and ZO-1 in vivo.[1]


  1. In vivo interaction of AF-6 with activated Ras and ZO-1. Yamamoto, T., Harada, N., Kawano, Y., Taya, S., Kaibuchi, K. Biochem. Biophys. Res. Commun. (1999) [Pubmed]
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