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

The GAP-related domain of the neurofibromatosis type 1 gene product interacts with ras p21.

The neurofibromatosis type 1 (NF1) protein contains a region of significant sequence similarity to ras p21 GTPase- activating protein (GAP) and the yeast IRA1 gene product. A fragment of NF1 cDNA encoding the GAP-related domain (NF1 GRD) was expressed, immunoaffinity purified, and assayed for effects on N-ras p21 GTPase activity. The GTPase of wild-type ras p21 was stimulated by NF1 GRD, but oncogenic mutants of ras p21 (Asp-12 and Val-12) were unaffected, and the GTPase of an effector mutant (Ala-38) was only weakly stimulated. NF1 GRD also down-regulated RAS function in S. cerevisiae. The affinity of NF1 GRD for ras p21 was estimated to be 250 nM: this is more than 20-fold higher than the affinity of GAP for ras p21. However, its specific activity was about 30 times lower. These kinetic measurements suggest that NF1 may be a significant regulator of ras p21 activity, particularly at low ras p21 concentrations.[1]


  1. The GAP-related domain of the neurofibromatosis type 1 gene product interacts with ras p21. Martin, G.A., Viskochil, D., Bollag, G., McCabe, P.C., Crosier, W.J., Haubruck, H., Conroy, L., Clark, R., O'Connell, P., Cawthon, R.M. Cell (1990) [Pubmed]
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