8OV6

Ternary structure of intramolecular bivalent glue degrader IBG1 bound to BRD4 and DCAF16:DDB1deltaBPB

8OV6 の概要

• エントリーDOI: 10.2210/pdb8ov6/pdb
• EMDBエントリー: 17172
• 分子名称: DDB1deltaBPB, DDB1- and CUL4-associated factor 16, Bromodomain-containing protein 4, ... (5 entities in total)
• 機能のキーワード: bromodomain, bet protein, dcaf16, bivalent glue, targeted protein degradation, tpd, transcription
• 由来する生物種: Homo sapiens; 詳細
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 165772.12

構造登録者

Cowan, A.D.,Sundaramoorthy, R.,Nakasone, M.A.,Ciulli, A. (登録日: 2023-04-25, 公開日: 2023-05-17, 最終更新日: 2024-03-13)

主引用文献

Hsia, O.,Hinterndorfer, M.,Cowan, A.D.,Iso, K.,Ishida, T.,Sundaramoorthy, R.,Nakasone, M.A.,Imrichova, H.,Schatz, C.,Rukavina, A.,Husnjak, K.,Wegner, M.,Correa-Saez, A.,Craigon, C.,Casement, R.,Maniaci, C.,Testa, A.,Kaulich, M.,Dikic, I.,Winter, G.E.,Ciulli, A.
Targeted protein degradation via intramolecular bivalent glues.
Nature, 627:204-211, 2024

PubMed Abstract: Targeted protein degradation is a pharmacological modality that is based on the induced proximity of an E3 ubiquitin ligase and a target protein to promote target ubiquitination and proteasomal degradation. This has been achieved either via proteolysis-targeting chimeras (PROTACs)-bifunctional compounds composed of two separate moieties that individually bind the target and E3 ligase, or via molecular glues that monovalently bind either the ligase or the target. Here, using orthogonal genetic screening, biophysical characterization and structural reconstitution, we investigate the mechanism of action of bifunctional degraders of BRD2 and BRD4, termed intramolecular bivalent glues (IBGs), and find that instead of connecting target and ligase in trans as PROTACs do, they simultaneously engage and connect two adjacent domains of the target protein in cis. This conformational change 'glues' BRD4 to the E3 ligases DCAF11 or DCAF16, leveraging intrinsic target-ligase affinities that do not translate to BRD4 degradation in the absence of compound. Structural insights into the ternary BRD4-IBG1-DCAF16 complex guided the rational design of improved degraders of low picomolar potency. We thus introduce a new modality in targeted protein degradation, which works by bridging protein domains in cis to enhance surface complementarity with E3 ligases for productive ubiquitination and degradation.

PubMed: 38383787
DOI: 10.1038/s41586-024-07089-6

実験手法

ELECTRON MICROSCOPY (3.77 Å)