Mating pathway is triggered by releasing G Br 17.2 The mating Factor pathway is triggered by signal transduction GTP Ga mutants are constitutively active Figure 17. 3 Either a or a factor/receptor interaction Receptor triggers the activation of a G protein, whose bg Constitutive expression al because cell subunits transduce the cle is halted Ge mutants cannot tigger pathway signal to the next stage in the pathway Receptor GDP 消当Figure 17.3 Either a or a factor/receptor interaction triggers the activation of a G protein, whose bg subunits transduce the signal to the next stage in the pathway. 17.2 The mating pathway is triggered by signal transduction