ADP-ribosylation factor 6 regulatory protein (Arf6 regulatory protein)

ADP-ribosylation factor 6 (Arf6) regulatory proteins are a specialized group of enzymes that control the activity of the Arf6 GTPase, a key regulator of membrane trafficking and actin dynamics at the cell periphery (Casanova, 2007). This group primarily consists of Guanine Nucleotide Exchange Factors (GEFs), such as the cytohesin and EFA6 families, which activate Arf6 by promoting the exchange of GDP for GTP, and GTPase-Activating Proteins (GAPs), such as the ACAP and GIT families, which return Arf6 to its inactive GDP-bound state (D'Souza-Schorey & Chavrier, 2006). These regulators are critical for processes including endocytosis, exocytosis, and cell migration, making them pivotal in physiological signaling. In disease contexts, overactivation of Arf6 by its GEFs is frequently associated with cancer metastasis, tumor invasion, and pathological angiogenesis (Li et al., 2017). Pharmacological intervention often targets the GEFs; for instance, the small molecule SecinH3 inhibits the cytohesin family of GEFs, thereby blocking Arf6 activation and reducing tumor growth in experimental models (Hafner et al., 2006). Additionally, inhibitors like NAV-2729 have been developed to disrupt the interaction between Arf6 and its regulatory GEFs to treat conditions like uveal melanoma and diabetic retinopathy (Yoo et al., 2016).

Other names

Arf6 GEFsArf6 GAPsArf6 regulatorsADP-ribosylation factor 6 guanine nucleotide exchange factorsADP-ribosylation factor 6 GTPase-activating proteins

Inhibition of guanine nucleotide exchange factor (GEF) activity to prevent Arf6 activation or modulation of GTPase-activating protein (GAP) activity.