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- W2002272618 abstract "Vav2 is a member of the Vav family that serves as guanine nucleotide exchange factors (GEFs) for the Rho family of Ras-related GTPases. Unlike Vav1, whose expression is restricted to cells of hematopoietic origin, Vav2 is broadly expressed. Recently, Vav2 has been identified as a substrate for the EGF receptor. Here, we show that in EGF-treated COS7 cells Vav2 is phosphorylated on tyrosine residues and associates with the EGF receptor. In addition, introducing point mutations into the SH2 domain of green fluorescens protein (GFP)-Vav2 fusion protein leads to the loss of Vav2 tyrosine phosphorylation in response to EGF. To investigate further the mechanism of Vav2 phosphorylation, N-terminal (NT) domain of Vav2 was transiently expressed in COS7 cells as GFP fusion protein. Whereas the NT domain of Vav2 is a preferred substrate for the activated EGF receptor in vitro, we could not detect tyrosine phosphorylation of the GFP-NT construct in EGF-treated cells. However, when the SH2 domain of Vav2 was fused to its NT domain, NT domain proved to be a substrate for the EGF receptor in vivo. These data suggest that membrane-targeting of Vav2 through its SH2 domain is an important event in the phosphorylation and activation of Vav2 in response to EGF." @default.
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- W2002272618 date "2001-07-01" @default.
- W2002272618 modified "2023-09-27" @default.
- W2002272618 title "Membrane-targeting is critical for the phosphorylation of Vav2 by activated EGF receptor" @default.
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- W2002272618 doi "https://doi.org/10.1016/s0898-6568(01)00172-3" @default.
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