Activated FGFR4 mutants:p-FRS2:GRB2:SOS1 activates RAS nucleotide exchange
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Activation of Erk1/2 downstream of FGFR mutants suggests that, as is the case for WT FGFR, FGFR mutant-associated SOS1 activates RAS nucleotide exchange from the inactive GDP-bound to the active GTP-bound state (see for instance, Weiss, 2010; Dutt, 2011; Raffioni, 1998; Cha, 2009; Hart, 2000; Turner, 2010; Kunii, 2008; Byron, 2008; Roidl, 2010; Chesi, 2001; Ronchetti, 2001; reviewed in Wesche, 2011).
FGFR突变体下游Erk1/2的激活表明,与野生型FGFR的情况相同,FGFR突变体相关的SOS1能够将RAS核苷酸交换从非活性GDP结合状态转变为活性GTP结合状态(参见例如,Weiss,2010;Dutt,2011;Raffioni,1998;Cha,2009;Hart,2000;Turner,2010;Kunii,2008;Byron,2008;Roidl,2010;Chesi,2001;Ronchetti,2001;综述见Wesche,2011)。
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