Title : Distal switch II region of Ras2p is required for interaction with guanine nucleotide exchange factor.

Pub. Date : 1996 Jul 19

PMID : 8663268






6 Functional Relationships(s)
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1 The interaction of Saccharomyces cerevisiae Ras2p with the catalytic domain of the GDP/GTP exchange factors (GEFs) mouse CDC25(Mm), yeast Cdc25p, and Sdc25p was analyzed by introducing the substitution R80D/N81D into Ras2p S24N, a mutant that is shown to interfere with the Ras2p wild type (wt)-GEF interaction by forming a stable complex. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C
2 The interaction of Saccharomyces cerevisiae Ras2p with the catalytic domain of the GDP/GTP exchange factors (GEFs) mouse CDC25(Mm), yeast Cdc25p, and Sdc25p was analyzed by introducing the substitution R80D/N81D into Ras2p S24N, a mutant that is shown to interfere with the Ras2p wild type (wt)-GEF interaction by forming a stable complex. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C
3 The interaction of Saccharomyces cerevisiae Ras2p with the catalytic domain of the GDP/GTP exchange factors (GEFs) mouse CDC25(Mm), yeast Cdc25p, and Sdc25p was analyzed by introducing the substitution R80D/N81D into Ras2p S24N, a mutant that is shown to interfere with the Ras2p wild type (wt)-GEF interaction by forming a stable complex. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C
4 The affinity of Ras2p S24N/R80D/N81D for GDP and GTP was decreased 3 and 4 orders of magnitude, respectively, like that of Ras2p S24N, whereas the double mutant behaved as Ras2p wt. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C
5 Like Ras2p S24N and unlike Ras2p R80D/N81D, the GTP-bound triple mutant did not activate adenylyl cyclase. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C
6 Thus, the triple mutant and Ras2p S24N have opposite properties toward the binding to GEF but similarly modified behaviors toward GDP, GTP, and adenylyl cyclase. Guanosine Triphosphate Ras family GTPase RAS2 Saccharomyces cerevisiae S288C