positively regulates GTPase activity GTPase activator activity GO:0005097 Reactome:R-HSA-9013022 Reactome:R-HSA-9013144 Ras GTPase activator activity Ral GTPase activator activity molecular_function Reactome:R-HSA-416559 GO:0005096 GO:0005099 GO:0005098 Rho GAP activity Rho GTPase activator activity Reactome:R-HSA-9014434 Reactome:R-HSA-428533 Reactome:R-HSA-5638007 ARF GAP activity Rac GTPase activator activity Reactome:R-HSA-9013111 GO:0030675 Rac GAP activity Reactome:R-HSA-4093339 Reactome:R-HSA-9018806 GAP activity Reactome:R-HSA-9624893 Reactome:R-HSA-9013437 Reactome:R-HSA-399935 Reactome:R-HSA-9013161 Reactome:R-HSA-9014295 Sar GTPase activator activity GO:0046582 GO:0008060 Reactome:R-HSA-9017488 RanGAP Reactome:R-HSA-9693282 Ral GAP activity Reactome:R-HSA-392513 Rab GTPase activator activity Ran GTPase activator activity Ras GAP activity Ran GAP activity Rap GAP activity Reactome:R-HSA-8981637 Reactome:R-HSA-8985594 Reactome:R-HSA-9018745 Binds to and increases the activity of a GTPase, an enzyme that catalyzes the hydrolysis of GTP. GO:0005101 Sar GAP activity GO:0005100 Reactome:R-HSA-416546 Rab GAP activity GO:0017123 Rap GTPase activator activity ARF GTPase activator activity Note that the name Sar derives from 'secretion-associated, Ras-related'. Reactome:R-HSA-428522 enzyme activator activity GTPase regulator activity