name GO_0005085 namespace http://purl.org/obo/owl/GO# parent GO_0003674 child GO_0005088 child GO_0005086 child GO_0017132 child GO_0005090 hasAlternativeId [] GO:0019839 label [en] guanyl-nucleotide exchange factor activity hasOBONamespace [] molecular_function comment [] Note that guanyl-nucleotide exchange factor (GEF) activity alters binding affinity, but not GTPase catalytic activity directly. Therefore GO:0005085 is under 'regulation of GTPase activity' but is not a 'GTPase regulator', which is reserved for cases where the action of one gene product directly alters the rate of catalysis by another gene product. hasAlternativeId [] GO:0016219 hasAlternativeId [] GO:0008433