9LTW

protein structure of DDB1-DDA1-DET1

9LTW の概要

• エントリーDOI: 10.2210/pdb9ltw/pdb
• EMDBエントリー: 63375 63383
• 分子名称: DET1 homolog, DNA damage-binding protein 1, DET1- and DDB1-associated protein 1 (3 entities in total)
• 機能のキーワード: e3 ligase, ligase
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 202884.13

構造登録者

Su, M.-Y.,Wang, S.,Teng, F. (登録日: 2025-02-06, 公開日: 2026-01-28)

主引用文献

Wang, S.,Teng, F.,Stjepanovic, G.,Rao, F.,Su, M.Y.
Cryo-EM structure of the human COP1-DET1 ubiquitin ligase complex.
Nat Commun, 17:543-543, 2026

PubMed Abstract: Ubiquitin modifications regulate fundamental cellular activities by modulating protein stability and function. The ubiquitin ligase COP1, which is present across species from plants to humans, plays a crucial role in the ubiquitination of developmental transcription factors. While COP1 can function independently, it can also be incorporated into CULLIN4-RING ubiquitin ligase (CRL4) complexes through the DET1 adaptor protein. Despite its biological significance, the structural and functional mechanisms of COP1 and DET1-containing complexes remains poorly understood. Here we present the cryo-electron microscopy structures of human COP1 in complex with DDB1-DDA1-DET1 and Ube2e2, revealing an inactive stacked assembly state. Co-expression with COP1 substrates including c-Jun or ETS2 disrupts this configuration, inducing a conformational rearrangement into a distinct dimeric state that allows substrate access. Structural modelling identifies the spatial organization of COP1 WD40 domains where substrate recruits. DET1 serves as a structural scaffold, bridging COP1 and Ube2e2 to initiate potential ubiquitin addition on substrates, while DDB1 recruits the CULLIN4-RBX1 complex to facilitate Ube2d3-mediated ubiquitin chain elongation. These results reveal the dynamic interplay between the structural states of the CRL4 E3 ligase complex and its substrate specific activation mechanism, offering mechanistic insights into ubiquitination regulation and a basis for future studies on E3 ligase dynamics.

PubMed: 41540009
DOI: 10.1038/s41467-026-68375-7

実験手法

ELECTRON MICROSCOPY (3.25 Å)