The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
Human ARF1 encodes ADP-ribosylation factor 1, a Class I ARF-family small GTPase that is N‑myristoylated and undergoes GDP↔GTP cycling to control membrane association and effector recruitment central to membrane trafficking. (li2023thearffamily pages 1-3, jackson2023anevolutionaryperspective pages 1-5, dejgaard2025arfsonthe pages 1-2)
The specific UniProt accession P84077 is explicitly referenced as the human Arf1 sequence used for structural modeling (AlphaFold2 model) in a high-quality primary structural study. (hooy2022selfassemblyandstructure media 42a5c13d)
ARF1 is a GTPase (EC 3.6.5.2) that catalyzes GTP hydrolysis in its active state; like many small GTPases, its intrinsic hydrolysis is low and is accelerated by ARF GTPase-activating proteins (ARF GAPs), while activation requires guanine nucleotide exchange factors (ARF GEFs) that promote GDP release and GTP loading. (dejgaard2025arfsonthe pages 1-2, nikolatou2023thearfgtpase pages 1-3)
A defining ARF-family feature is an N-terminal amphipathic helix with N‑myristoylation that is sequestered in a hydrophobic pocket in the GDP state and becomes exposed upon GTP binding, allowing stable membrane insertion/association; ARF1 is therefore comparatively soluble in the GDP state and membrane-bound in the GTP state. (li2023thearffamily pages 1-3, jackson2023anevolutionaryperspective pages 1-5)
Functionally, ARF•GTP–dependent coat recruitment is not simply “switch on/off”; productive trafficking requires GTP hydrolysis, and blocking hydrolysis causes trafficking defects (highlighting the importance of cycling). (turn2025arfthemost pages 6-7)
ARF-family proteins (including ARF1) share a conserved small GTPase fold with switch regions (effector/regulator interfaces) and an N-terminal membrane-binding module (myristoylated helix). (nikolatou2023thearfgtpase pages 1-3, hirschenberger2023arf1preventsaberranta pages 1-2)
ARF1’s canonical role is to initiate vesicle formation by recruiting coats and adaptors to membranes when in its GTP-bound, membrane-associated state. (li2023thearffamily pages 1-3, dejgaard2025arfsonthe pages 1-2)
COPI / early secretory pathway. A widely supported model is that ARF1-GTP at the Golgi recruits COPI to drive retrograde trafficking (Golgi→ER) and related early secretory steps. (li2023thearffamily pages 3-5, torii2024myelinationbysignaling pages 2-2)
AP-1 / TGN–endosome sorting (and clathrin-independent coats). ARF1-GTP recruits and activates AP complexes, notably AP‑1 at TGN/endosomal membranes. A structural reconstitution study shows myristoylated, GTP-bound Arf1 recruits AP‑1 to membranes and stabilizes AP‑1 in an active conformation, and that AP‑1:Arf1 can form a tubular coat without clathrin (a mechanistic basis for a class of tubulovesicular coats). (hooy2022selfassemblyandstructure pages 1-2)
A recent review emphasizing ArfGEF compartmentalization states that BIG1-mediated ARF1 activation drives clathrin/AP‑1–positive vesicle budding from the trans-Golgi toward endosomes and/or plasma membrane, while GBF-family GEFs activate ARF1 at the cis-Golgi to regulate COPI-positive budding. (torii2024myelinationbysignaling pages 3-3)
ARF1 modulates membrane identity partly by controlling lipid enzymes. In a 2023 review, human ARF1 is described as directly activating PI4KB, stimulating PI4P production, and more broadly ARF-family proteins regulate lipid-metabolic enzymes and phosphoinositide landscapes that support coat recruitment and membrane curvature. (li2023thearffamily pages 5-6, li2023thearffamily pages 3-5)
A 2023 review summarizes evidence that ARF1 contributes to amino-acid–dependent mTORC1 signaling, affecting lysosomal localization/activation of mTORC1; in that framework Brefeldin A (an ARF GEF inhibitor) disrupts amino-acid–induced lysosomal localization of mTORC1, and ArfGAP1 binds mTORC1 to inhibit its lysosomal localization/activation. (li2023thearffamily pages 5-6)
Recent synthesis highlights that ARF1 is found at ER–Golgi interface compartments (cis-Golgi/ERGIC) and also on TGN and TGN-derived tubules, with localization/function linked to specific ARFGEFs. (torii2024myelinationbysignaling pages 2-2)
GBF1 is described as a preferential ARF1 GEF localized to ER exit sites and regulating the COPI complex involved in ER–Golgi and Golgi-to-ER transport. (torii2024myelinationbysignaling pages 2-2)
ARF1 localizes to and functions at the TGN/endosomal interface where it recruits AP complexes (AP‑1 emphasized). (hooy2022selfassemblyandstructure pages 1-2, torii2024myelinationbysignaling pages 3-3)
A cancer/metastasis-focused review further notes ARF1 functions beyond the Golgi in early endocytic compartments, recycling endosomes (including retrograde transport back to the TGN), and ER–TGN steps. (nikolatou2023thearfgtpase pages 1-3)
The same 2023 review reports ARF1 at mitochondria–ER contact sites and links ARF1 to broader organelle dynamics. (nikolatou2023thearfgtpase pages 1-3)
A 2023 Nature Communications study identifies ARF1 as a negative regulator of cGAS–STING type I interferon signaling and reports that heterozygous, GTPase-defective ARF1 missense mutations (e.g., R99C/R99H) cause a type I interferonopathy with elevated interferon-stimulated gene expression. Mechanistically, mutant ARF1 perturbs mitochondrial morphology (promoting mitochondrial DNA release and cGAS activation) and causes accumulation of active STING at Golgi/ERGIC due to defective retrograde transport, indicating a dual role for ARF1 in mitochondrial integrity and STING recycling. (hirschenberger2023arf1preventsaberranta pages 1-2)
A 2023 Nature Cell Biology study links Arf1 activity to fatty-acid storage/utilization and mitochondrial morphology/ATP synthesis. In yeast, a hyperactive Arf1 mutant caused fatty-acid accumulation in lipid droplets, mitochondrial fragmentation, and decreased ATP synthesis, and the authors report that Arf1’s role in fatty-acid metabolism is conserved in mammals, implicating Arf1 in metabolic–organelle coupling (potentially via contact sites). (enkler2023arf1coordinatesfatty pages 1-2)
A 2024 Journal of Neurochemistry review emphasizes ArfGEF-defined spatial control: GBF activates Arf1 at cis-Golgi for COPI-positive budding, whereas BIG1 activates Arf1 at trans-Golgi/TGN for clathrin/AP‑1–positive budding toward endosomes/plasma membrane, and notes distinct Arf distributions resolved by advanced imaging. (torii2024myelinationbysignaling pages 3-3, torii2024myelinationbysignaling pages 2-2)
HIV-1 immune evasion: A structural/mechanistic study shows HIV-1 Nef hijacks AP‑1 with Arf1 to sequester MHC-I, with AP‑1:Arf1:Nef:MHC-I forming a continuous tubular coat on membranes without clathrin—providing a concrete mechanism for immune evasion rooted in ARF1-dependent sorting machinery. (hooy2022selfassemblyandstructure pages 1-2)
NAV-2729 as an ARF-pathway probe (2023): A 2023 Journal of Biological Chemistry study concludes NAV‑2729 has a complex target profile, inhibiting multiple ARF GEFs and ARF GAPs (often via PH-domain interactions) rather than binding ARFs directly in their assays. Reported quantitative data include: NAV‑2729 cytotoxicity EC50 ~8–11 μM, inhibition of specific regulators (e.g., Brag2Sec7-PH IC50 ~7.1 μM, AGAP1 ~2.7 μM, ASAP1PZA ~4.6 μM, ASAP3PZA ~9.1 μM, among others), and a thermal shift proteomics result of 45 proteins with significant shifts (20 increased stability, 25 decreased). (rosenberg2023thesmallmolecule pages 3-4, rosenberg2023thesmallmolecule pages 13-14)
Brefeldin A (BFA) and GBF1/BIG inhibition: The same 2023 JBC paper notes BFA inhibits ARF1 GEFs GBF1 and BIG1/2, and reports BFA was broadly toxic with an approximately 10-fold higher potency in human vs mouse cells in their referenced comparisons. (rosenberg2023thesmallmolecule pages 1-3)
Computational/repurposing pipeline suggesting ARF1 as a drug target (2023): A 2023 Nature Communications paper proposes ARF1 as a target of the proton pump inhibitor rabeprazole, supported by multiple orthogonal assays (thermal shift, nucleotide exchange assays with ARNO, and cellular ARF1 activity assays), and reports ARF1 knockdown abolishes several rabeprazole-linked phenotypes (lipid droplet accumulation, tumor growth suppression, immune effects), consistent with ARF1-dependent pharmacology in that model. (chen2023sequencebaseddrugdesign pages 8-9)
A contemporary perspective argues ARFs are often oversimplified as binary “molecular switches,” and emphasizes that cycling itself (including GAP-stimulated hydrolysis) is integral to ARF function, particularly in membrane traffic. (turn2025arfthemost pages 6-7)
Database-level disease/trait associations from Open Targets link ARF1 to multiple disease areas (e.g., HIV infection and neurodegenerative disease categories, and periventricular nodular heterotopia phenotypes), providing a structured map of reported associations and supporting literature pointers. (OpenTargets Search: -ARF1)
A representative figure set from the AP‑1:Arf1 tubular coat study provides visual support for ARF1’s role in coat assembly at membranes and confirms use of the human Arf1 (UniProt P84077) structural model in analysis. (hooy2022selfassemblyandstructure media 42a5c13d)
ARF1 (P84077) is a myristoylated ARF-family small GTPase that couples a GTPase cycle to membrane recruitment and effector assembly. Its primary, best-supported function is to orchestrate vesicle biogenesis and sorting through recruitment of COPI (cis-Golgi/ERGIC; GBF1-defined) and AP complexes such as AP‑1 (TGN/endosomes; BIG1-defined), while shaping lipid environments via enzymes such as PI4KB. Recent work expands ARF1 biology into innate immune control (cGAS–STING) and metabolic/mitochondrial homeostasis, and chemical-biology studies highlight both the tractability and the complexity of pharmacologically perturbing the ARF system. (li2023thearffamily pages 3-5, torii2024myelinationbysignaling pages 3-3, hooy2022selfassemblyandstructure pages 1-2, hirschenberger2023arf1preventsaberranta pages 1-2, enkler2023arf1coordinatesfatty pages 1-2)
References
(li2023thearffamily pages 1-3): Fu‐Long Li and Kun‐Liang Guan. The arf family gtpases: regulation of vesicle biogenesis and beyond. BioEssays, Mar 2023. URL: https://doi.org/10.1002/bies.202200214, doi:10.1002/bies.202200214. This article has 18 citations and is from a peer-reviewed journal.
(jackson2023anevolutionaryperspective pages 1-5): Catherine L. Jackson, Julie Ménétrey, Mandeep Sivia, Joel B. Dacks, and Marek Eliáš. An evolutionary perspective on arf family gtpases. Current Opinion in Cell Biology, 85:102268, Dec 2023. URL: https://doi.org/10.1016/j.ceb.2023.102268, doi:10.1016/j.ceb.2023.102268. This article has 14 citations and is from a peer-reviewed journal.
(dejgaard2025arfsonthe pages 1-2): Selma Yilmaz Dejgaard and John F. Presley. Arfs on the golgi: four conductors, one orchestra. Frontiers in Molecular Biosciences, Jul 2025. URL: https://doi.org/10.3389/fmolb.2025.1612531, doi:10.3389/fmolb.2025.1612531. This article has 6 citations.
(hooy2022selfassemblyandstructure media 42a5c13d): Richard M. Hooy, Yuichiro Iwamoto, Dan A. Tudorica, Xuefeng Ren, and James H. Hurley. Self-assembly and structure of a clathrin-independent ap-1:arf1 tubular membrane coat. Science Advances, Oct 2022. URL: https://doi.org/10.1126/sciadv.add3914, doi:10.1126/sciadv.add3914. This article has 29 citations and is from a highest quality peer-reviewed journal.
(nikolatou2023thearfgtpase pages 1-3): Konstantina Nikolatou, David M. Bryant, and Emma Sandilands. The arf gtpase regulatory network in collective invasion and metastasis. Biochemical Society Transactions, 51:1559-1569, Aug 2023. URL: https://doi.org/10.1042/bst20221355, doi:10.1042/bst20221355. This article has 3 citations and is from a peer-reviewed journal.
(turn2025arfthemost pages 6-7): Rachel E. Turn, Joel Bryan Dacks, Eric M. Rosenberg, Olivier Soubias, John K. Northup, and Paul A. Randazzo. Arf: the most misunderstood gtpase i ever knew - why study arf gaps. Frontiers in Molecular Biosciences, Oct 2025. URL: https://doi.org/10.3389/fmolb.2025.1668286, doi:10.3389/fmolb.2025.1668286. This article has 0 citations.
(hirschenberger2023arf1preventsaberranta pages 1-2): Maximilian Hirschenberger, Alice Lepelley, Ulrich Rupp, Susanne Klute, Victoria Hunszinger, Lennart Koepke, Veronika Merold, Blaise Didry-Barca, Fanny Wondany, Tim Bergner, Tatiana Moreau, Mathieu P. Rodero, Reinhild Rösler, Sebastian Wiese, Stefano Volpi, Marco Gattorno, Riccardo Papa, Sally-Ann Lynch, Marte G. Haug, Gunnar Houge, Kristen M. Wigby, Jessica Sprague, Jerica Lenberg, Clarissa Read, Paul Walther, Jens Michaelis, Frank Kirchhoff, Carina C. de Oliveira Mann, Yanick J. Crow, and Konstantin M. J. Sparrer. Arf1 prevents aberrant type i interferon induction by regulating sting activation and recycling. Nature Communications, Nov 2023. URL: https://doi.org/10.1038/s41467-023-42150-4, doi:10.1038/s41467-023-42150-4. This article has 54 citations and is from a highest quality peer-reviewed journal.
(li2023thearffamily pages 3-5): Fu‐Long Li and Kun‐Liang Guan. The arf family gtpases: regulation of vesicle biogenesis and beyond. BioEssays, Mar 2023. URL: https://doi.org/10.1002/bies.202200214, doi:10.1002/bies.202200214. This article has 18 citations and is from a peer-reviewed journal.
(torii2024myelinationbysignaling pages 2-2): Tomohiro Torii, Yuki Miyamoto, and Junji Yamauchi. Myelination by signaling through arf guanine nucleotide exchange factor. Journal of Neurochemistry, 168:2201-2213, Jun 2024. URL: https://doi.org/10.1111/jnc.16141, doi:10.1111/jnc.16141. This article has 8 citations and is from a domain leading peer-reviewed journal.
(hooy2022selfassemblyandstructure pages 1-2): Richard M. Hooy, Yuichiro Iwamoto, Dan A. Tudorica, Xuefeng Ren, and James H. Hurley. Self-assembly and structure of a clathrin-independent ap-1:arf1 tubular membrane coat. Science Advances, Oct 2022. URL: https://doi.org/10.1126/sciadv.add3914, doi:10.1126/sciadv.add3914. This article has 29 citations and is from a highest quality peer-reviewed journal.
(torii2024myelinationbysignaling pages 3-3): Tomohiro Torii, Yuki Miyamoto, and Junji Yamauchi. Myelination by signaling through arf guanine nucleotide exchange factor. Journal of Neurochemistry, 168:2201-2213, Jun 2024. URL: https://doi.org/10.1111/jnc.16141, doi:10.1111/jnc.16141. This article has 8 citations and is from a domain leading peer-reviewed journal.
(li2023thearffamily pages 5-6): Fu‐Long Li and Kun‐Liang Guan. The arf family gtpases: regulation of vesicle biogenesis and beyond. BioEssays, Mar 2023. URL: https://doi.org/10.1002/bies.202200214, doi:10.1002/bies.202200214. This article has 18 citations and is from a peer-reviewed journal.
(enkler2023arf1coordinatesfatty pages 1-2): Ludovic Enkler, Viktoria Szentgyörgyi, Mirjam Pennauer, Cristina Prescianotto-Baschong, Isabelle Riezman, Aneta Wiesyk, Reut Ester Avraham, Martin Spiess, Einat Zalckvar, Roza Kucharczyk, Howard Riezman, and Anne Spang. Arf1 coordinates fatty acid metabolism and mitochondrial homeostasis. Nature Cell Biology, 25:1157-1172, Jul 2023. URL: https://doi.org/10.1038/s41556-023-01180-2, doi:10.1038/s41556-023-01180-2. This article has 84 citations and is from a highest quality peer-reviewed journal.
(rosenberg2023thesmallmolecule pages 3-4): Eric M. Rosenberg, Xiaoying Jian, Olivier Soubias, Hye-Young Yoon, Mukesh P. Yadav, Sarah Hammoudeh, Sandeep Pallikkuth, Itoro Akpan, Pei-Wen Chen, Tapan K. Maity, Lisa M. Jenkins, Marielle E. Yohe, R. Andrew Byrd, and Paul A. Randazzo. The small molecule inhibitor nav-2729 has a complex target profile including multiple adp-ribosylation factor regulatory proteins. Mar 2023. URL: https://doi.org/10.1016/j.jbc.2023.102992, doi:10.1016/j.jbc.2023.102992. This article has 24 citations and is from a domain leading peer-reviewed journal.
(rosenberg2023thesmallmolecule pages 13-14): Eric M. Rosenberg, Xiaoying Jian, Olivier Soubias, Hye-Young Yoon, Mukesh P. Yadav, Sarah Hammoudeh, Sandeep Pallikkuth, Itoro Akpan, Pei-Wen Chen, Tapan K. Maity, Lisa M. Jenkins, Marielle E. Yohe, R. Andrew Byrd, and Paul A. Randazzo. The small molecule inhibitor nav-2729 has a complex target profile including multiple adp-ribosylation factor regulatory proteins. Mar 2023. URL: https://doi.org/10.1016/j.jbc.2023.102992, doi:10.1016/j.jbc.2023.102992. This article has 24 citations and is from a domain leading peer-reviewed journal.
(rosenberg2023thesmallmolecule pages 1-3): Eric M. Rosenberg, Xiaoying Jian, Olivier Soubias, Hye-Young Yoon, Mukesh P. Yadav, Sarah Hammoudeh, Sandeep Pallikkuth, Itoro Akpan, Pei-Wen Chen, Tapan K. Maity, Lisa M. Jenkins, Marielle E. Yohe, R. Andrew Byrd, and Paul A. Randazzo. The small molecule inhibitor nav-2729 has a complex target profile including multiple adp-ribosylation factor regulatory proteins. Mar 2023. URL: https://doi.org/10.1016/j.jbc.2023.102992, doi:10.1016/j.jbc.2023.102992. This article has 24 citations and is from a domain leading peer-reviewed journal.
(chen2023sequencebaseddrugdesign pages 8-9): Lifan Chen, Zi-sheng Fan, Jie Chang, Rui-rui Yang, Hui Hou, Hao Guo, Ying-hui Zhang, Tianbiao Yang, Chenmao Zhou, Qibang Sui, Zhengyang Chen, Chenni Zheng, Xinyue Hao, Keke Zhang, Rongrong Cui, Zehong Zhang, Hudson Ma, Yiluan Ding, Naixia Zhang, Xiaojie Lu, Xiaomin Luo, Hualiang Jiang, Sulin Zhang, and M. Zheng. Sequence-based drug design as a concept in computational drug design. Nature Communications, Jul 2023. URL: https://doi.org/10.1038/s41467-023-39856-w, doi:10.1038/s41467-023-39856-w. This article has 143 citations and is from a highest quality peer-reviewed journal.
(OpenTargets Search: -ARF1): Open Targets Query (-ARF1, 11 results). Buniello, A. et al. (2025). Open Targets Platform: facilitating therapeutic hypotheses building in drug discovery. Nucleic Acids Research.