This entry represents the N-terminal domain of DWD hypersensitive to UV-B 1 from Arabidopsis thaliana, which may act as a substrate receptor of a CUL4-RING E3 ubiquitin-protein ligase (CRL4) complex involved in the negative regulation of cellular responses to ultraviolet-B (UV-B) illumination, likely in coordination with RUP1 [1,2]. It interacts with COP1 and probably prevents the formation of active UVR8-COP1 complex thus avoiding UVR8-COP1-mediated positive regulation of UV-B responses [2]. DHU1 consists of two distant domains, LRR included in this entry and WD40 (Pfam:PF00400), which mediate protein-protein interactions.

1: DWD HYPERSENSITIVE TO UV-B 1 is negatively involved in UV-B mediated cellular responses in Arabidopsis. Kim SH, Kim H, Seo KI, Kim SH, Chung S, Huang X, Yang P, Deng XW, Lee JH; Plant Mol Biol. 2014;86:571-583. PMID:25193399

2: DHU1 negatively regulates UV-B signaling via its direct interaction with COP1 and RUP1. Kim SH, Kim H, Chung S, Lee JH; Biochem Biophys Res Commun. 2017;491:285-290. PMID:28735869