Enables GTPase activity; guanyl ribonucleotide binding activity; and identical protein binding activity. Involved in defense response to Gram-negative bacterium; defense response to protozoan; and regulation of autophagy. Acts upstream of or within cellular response to interferon-beta and response to bacterium. Located in endoplasmic reticulum membrane and symbiont-containing vacuole membrane. Is expressed in several structures, including cardiovascular system; foregut; genitourinary system; limb; and respiratory system.
