Arrestin domain-containing protein (ARRDC)

The alpha-arrestin family, also known as arrestin-related trafficking adaptors (ARTs), represents an evolutionarily ancient group of proteins that function as cargo-specific adaptors for the endocytic machinery. In humans, this family comprises six members: the arrestin domain-containing proteins (ARRDC1–5) and thioredoxin-interacting protein (TXNIP). These proteins utilize C-terminal PY motifs to recruit NEDD4-like E3 ubiquitin ligases to various plasma membrane targets, including G protein-coupled receptors (GPCRs), nutrient transporters, and growth factor receptors, thereby facilitating their ubiquitination and subsequent lysosomal degradation. Beyond their role in protein trafficking, alpha-arrestins are critical regulators of cellular metabolism and redox balance; for instance, TXNIP inhibits the antioxidant function of thioredoxin and activates the NLRP3 inflammasome, while ARRDC3 modulates insulin receptor signaling and serves as a tumor suppressor. Therapeutic targeting of alpha-arrestins is currently focused on metabolic and oncological applications, with drugs like verapamil and metformin known to downregulate TXNIP expression to treat diabetes and inflammatory conditions. As essential mediators of membrane proteostasis, these adaptors are increasingly recognized as viable targets for restoring receptor sensitivity and mitigating oxidative stress-induced cell damage.

Other names

Alpha-arrestinArrestin-related trafficking adaptorArrestin domain-containing protein (ARRDC1-5)Thioredoxin-interacting protein (TXNIP)Thioredoxin-binding protein-2 (TBP-2)TLIMP (Thioredoxin-binding protein-2-like inducible membrane protein)ART family

Inhibition of target protein expression (specifically TXNIP) to reduce oxidative stress and inflammasome activation; Modulation of protein trafficking to promote or prevent the degradation of membrane-bound receptors and transporters.