This is the C-terminal conserved 400 residues of Det1 proteins of approximately 550 amino acids [1]. Det1 (de-etiolated-1) is an essential negative regulator of plant light responses, and it is a component of the Arabidopsis CDD complex containing DDB1 and COP10 ubiquitin E2 variant. Mammalian Det1 forms stable DDD-E2 complexes, consisting of DDB1, DDA1 (DET1, DDB1 Associated 1), and a member of the UBE2E group of canonical ubiquitin conjugating enzymes and modulates Cul4A function [2].

1: The tomato dark green mutation is a novel allele of the tomato homolog of the DEETIOLATED1 gene. Levin I, Frankel P, Gilboa N, Tanny S, Lalazar A; Theor Appl Genet. 2003;106:454-460. PMID:12589545

2: Mammalian DET1 regulates Cul4A activity and forms stable complexes with E2 ubiquitin conjugating enzymes. Pick E, Lau OS, Tsuge T, Menon S, Tong Y, Dohmae N, Plafker S, Deng XW, Wei N; Mol Cell Biol. 2007; [Epub ahead of print] PMID:17452440