Recombinant Human ITCH/AIP4 Isoform 2 Protein, CF

The mammalian Itchy homolog, or ITCH, (also known as Atrophin-1-interacting protein 4 or AIP4) is a HECT domain class ubiquitin E3 ligase. ITCH/AIP4 ubiquitinates the phosphorylated form of Dishevelled protein and promotes its degradation via the Ubiquitin Proteasome System, thereby inhibiting canonical Wnt signaling. The absence of ITCH/AIP4 has been shown to cause severe autoimmune disease in mice. Recent studies have identified multisystem autoimmune disease and morphologic and developmental abnormalities in human patients with ITCH/AIP4 deficiency, thus underscoring the importance of ITCH/AIP4 in many cellular processes. This ligase may catalyze K29-, K48-, and/or K63-linked polyubiquitin chain formation on a variety of reported targets. This untagged, ITCH/AIP4 isoform 2 recombinant protein demonstrates strong autoubiquitination activity in vitro.