ADP-ribosylation factor GTPase-activating protein 1 is an enzyme that in humans is encoded by the ARFGAP1gene.[5][6] Two transcript variants encoding different isoforms have been found for this gene.
Function
The protein encoded by this gene is a GTPase-activating protein (GAP) which associates with the Golgi apparatus and which interacts with ADP-ribosylation factor 1 (ARF1). The encoded protein promotes hydrolysis of ARF1-bound GTP and is required for the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. The activity of this protein is stimulated by phosphoinositides and inhibited by phosphatidylcholine.[6]
The protein has two amphipathic lipid packing sensor motifs (ALPS), that let the protein sense the curvature of the membrane (<30 nm) or lipid packing defects, and in this way evaluate if the vesicle is mature and ready for coat disassembly.[7][8]
^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Huber I, Rotman M, Pick E, Makler V, Rothem L, Cukierman E, Cassel D (February 2001). "Expression, purification, and properties of ADP-ribosylation factor (ARF) GTPase activating protein-1". Regulators and Effectors of Small GTPases Part E: GTPases Involved in Visicular Traffic. Methods in Enzymology. Vol. 329. pp. 307–16. doi:10.1016/S0076-6879(01)29092-2. ISBN9780121822309. PMID11210549.
^Mesmin B, Drin G, Levi S, Rawet M, Cassel D, Bigay J, Antonny B (February 2007). "Two lipid-packing sensor motifs contribute to the sensitivity of ArfGAP1 to membrane curvature". Biochemistry. 46 (7): 1779–90. doi:10.1021/bi062288w. PMID17253781.
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Zhang C, Yu Y, Zhang S, Liu M, Xing G, Wei H, Bi J, Liu X, Zhou G, Dong C, Hu Z, Zhang Y, Luo L, Wu C, Zhao S, He F (February 2000). "Characterization, chromosomal assignment, and tissue expression of a novel human gene belonging to the ARF GAP family". Genomics. 63 (3): 400–8. doi:10.1006/geno.1999.6095. PMID10704287.