Gosset ADP-ribosylation factor guanine nucleotide exchange factors Overview
ADP-ribosylation factor guanine nucleotide exchange factors (ARF-GEFs) are a family of proteins that catalyze the exchange of GDP for GTP on ADP-ribosylation factors (ARFs), which are small GTP-binding proteins involved in membrane trafficking, vesicle formation, and cytoskeletal dynamics. ARF-GEFs play a central role in regulating the activity of ARFs by promoting their active, GTP-bound state. They contain a conserved Sec7 domain responsible for nucleotide exchange activity and are divided into subfamilies like Gea/GBF/GNOM, Sec7/BIG, Cytohesin/ARNO, and EFA6, each with distinct localization and function. Their activity is often sensitive to brefeldin A (BFA). Dysregulation has been linked to diseases involving secretion disorders or neurodegeneration.
Mechanism of Action
Catalyzes GDP-to-GTP exchange on ARFs, activating them for downstream signaling in vesicle formation and protein trafficking.
Biological Functions
Disease Associations
Safety Considerations
- Dysregulation can lead to intracellular trafficking defects.
- Inhibition can disrupt Golgi structure.