go_id,ontology,go_term,term_definition,evidence GO:0005096,MF,"GTPase activator activity","Binds to and increases the activity of a GTPase, an enzyme that catalyzes the hydrolysis of GTP.",IEA GO:0005615,CC,"extracellular space","That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.",TAS GO:0005737,CC,cytoplasm,"All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.",IDA GO:0005886,CC,"plasma membrane","The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.",IEA GO:0046982,MF,"protein heterodimerization activity","Interacting selectively and non-covalently with a nonidentical protein to form a heterodimer.",IPI GO:0051056,BP,"regulation of small GTPase mediated signal transduction","Any process that modulates the frequency, rate or extent of small GTPase mediated signal transduction.",TAS GO:0090630,BP,"activation of GTPase activity","Any process that initiates the activity of an inactive GTPase through the replacement of GDP by GTP.",IDA