ARFGEF1 Knockout Cell Line (HEK293)

The choice depends on whether you are studying ARFGEF1 (BIG1)'s role as an Arf GTPase guanine nucleotide exchange factor or modeling its functions in Golgi trafficking. The Knockout line is the standard tool for asking whether ARFGEF1 is required for these processes — ARFGEF1/BIG1 is a Sec7-domain Arf GEF that activates Arf1/Arf3 GTPases at the trans-Golgi network for COP-I-independent vesicle formation; ARFGEF1 is closely related to ARFGEF2/BIG2; both are inhibited by ⭐ brefeldin A (the classical fungal toxin disrupting Golgi structure). Overexpression is useful for studying ARFGEF1 gain-of-function effects. Important consideration: ARFGEF1 and ARFGEF2 share substantial substrate scope — single ARFGEF1 knockout may show modest phenotypes if ARFGEF2 compensates. Rescue with wild-type or catalytically-dead (E794K Sec7 domain glutamate finger) ARFGEF1 is the standard specificity control. The knockout is a critical specificity tool for brefeldin A research (BFA classically inhibits ARFGEF1/2; selective compounds AMF-26 and others are in development) and Golgi trafficking studies.

Primary applications: • Arf GTPase activation: Arf-GTP loading analysis in ARFGEF1-null cells. • Brefeldin A specificity: critical genetic control for brefeldin A research given BFA inhibits ARFGEF1/2. • Golgi morphology: TGN structure analysis given ARFGEF1's TGN trafficking role. • ARFGEF1/2 paralog dissection: ARFGEF2 expression analysis to interpret ARFGEF1-specific functions. EDITGENE recommends this model for researchers investigating Arf GEF biology and brefeldin A pharmacology.

Yes. ARFGEF1 rescue experiments are well-established for Arf GEF research: • Construct design: use a codon-modified ARFGEF1 sequence with a small C-terminal tag (FLAG, HA). ARFGEF1 has DCB, HUS, Sec7 (catalytic), HDS1-3 domains — preserve all elements. • Catalytically-dead rescue: E794K mutation in the Sec7 domain catalytic glutamate finger abolishes Arf-GEF activity. • Brefeldin A-resistant rescue: F190Y mutation in the Sec7 domain confers BFA resistance, enabling on-target BFA validation. • Functional readout: rescue should restore Arf-GTP loading and Golgi structure. HEK293 transduces efficiently with lentivirus and supports stable rescue line generation.