RING finger, H2 subclass, found in E3 ubiquitin-protein ligase Deltex2 (DTX2) and similar proteins
DTX2, also known as RING finger protein 58, together with DTX1 and DTX4, forms a family of related proteins that are the mammalian homologs of Drosophila Deltex, a known regulator of Notch signals. Like DTX1 and DTX4, DTX2 is expressed in thymocytes. It interacts with the intracellular domain of Notch receptors and acts as a negative regulator of Notch signals in T cells. However, the endogenous levels of DTX1 and DTX2 is not important for regulating Notch signals during thymocyte development. DTX2 contains N-terminal two Notch-binding WWE domains that physically interact with the Notch ankyrin domains, a proline-rich motif that shares homology with SH3-binding domains, and a C3H2C3-type RING-H2 finger at the C-terminus. It also harbors two nuclear localization signals.