Deltex E3 ubiquitin ligase 4 (DTX4)

Deltex E3 ubiquitin ligase 4 (DTX4) is an enzyme of the Deltex family, functioning as a RING-type E3 ubiquitin ligase primarily expressed in the cytoplasm. It catalyzes the covalent attachment of ubiquitin to substrate proteins, mediating their degradation, and plays key regulatory roles in developmental signaling (notably the Notch pathway) and the negative regulation of innate immune responses, including degradation of TBK1[1][5]. DTX4’s activity is crucial for cell growth, differentiation, apoptosis, and protein homeostasis, and it is implicated in cancer, immunity, and potentially other disease processes through its post-translational modification function[1][5]. Its complex interactome and involvement in multiple cellular processes make it a potential diagnostic and therapeutic target, although direct drugs targeting DTX4 are not currently available[1][5].

Other names

E3 ubiquitin-protein ligase DTX4KIAA0937RNF155Deltex4Protein deltex-4RING finger protein 155RING-type E3 ubiquitin transferase DTX4Deltex 4 homologDeltex 4Deltex homolog 4E3 ubiquitin ligaseDTX4

Drugs potentially targeting DTX4 would activate or inhibit its E3 ubiquitin ligase activity, thus affecting substrate protein degradation via ubiquitination and modulation of Notch signaling and innate immune pathways[1][5]. General mechanism of action for E3 ligase-targeting agents includes proteasome-mediated protein degradation after Lys48-linked polyubiquitination[5][4]. *PROTACs* and similar technologies may exploit DTX4’s E3 ligase function for targeted protein degradation, though no direct DTX4-based examples are reported (inference)[4].