GTPase-activating protein GIT1 (GIT1)

GTPase-activating protein GIT1 (GIT1) is a multidomain enzyme belonging to the ArfGAP protein family, primarily functioning as a GTPase-activating protein (GAP) for ADP-ribosylation factor (Arf) small GTPases, notably ARF6[1][2][4]. In addition to its enzymatic activity, GIT1 acts as a scaffolding protein integrating signals from small GTPase and protein kinase pathways and facilitating interactions between proteins such as PIX, PAK, paxillin, and MEK[1][2][4]. GIT1 is involved in the regulation of cytoskeletal dynamics, cell migration, endocytosis, and synaptic development, localizing to focal adhesions and endocytic structures[1][2][4]. Dysregulation or altered expression of GIT1 has been implicated in several pathological processes, including cancer progression (via MEK/ERK signaling scaffolding and effects on proliferation/metastasis), cardiovascular disease (via signal transduction and cytoskeletal regulation), and neurodevelopmental disorders[1][2][4]. GIT1 contains several conserved domains, including an N-terminal zinc finger ArfGAP domain, ankyrin repeats, a Spa2-homology domain (SHD), coiled-coil domain, and a carboxyl-terminal region that interacts with paxillin[1][2][4]. As of now, no clinically approved drugs are known to interact directly with GIT1, but it remains a research target in oncology and neurobiology[1][2][4].

Other names

ARF GTPase-activating protein GIT1ARF GAP GIT1CAT-1CAT1Cool-associated and tyrosine-phosphorylated protein 1G protein-coupled receptor kinase-interactor 1GRK-interacting protein 1p95-APP1p95-ADP ribosylation factor GTPase-activating proteinPaxillin-kinase linkerPKLG protein-coupled receptor kinase interacting ArfGAP 1cool-associated and tyrosine-phosphorylated protein 1

Inhibition/modulation of ARF GTPase pathway through GAP activity; Modulation of protein–protein interaction networks involved in cell migration and signaling