Details

Autor(en) / Beteiligte

• Geiger, Thomas M.
• Walz, Michael
• Meyners, Christian
• Kuehn, Angela
• Dreizler, Johannes K.
• Sugiarto, Wisely O.
• Maciel, Edvaldo V. S.
• Zheng, Min
• Lermyte, Frederik
• Hausch, Felix

Titel

Discovery of a Potent Proteolysis Targeting Chimera Enables Targeting the Scaffolding Functions of FK506‐Binding Protein 51 (FKBP51)

Ist Teil von

• Angewandte Chemie International Edition, 2024-01, Vol.63 (3), p.e202309706-n/a

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The FK506‐binding protein 51 (FKBP51) is a promising target in a variety of disorders including depression, chronic pain, and obesity. Previous FKBP51‐targeting strategies were restricted to occupation of the FK506‐binding site, which does not affect core functions of FKBP51. Here, we report the discovery of the first FKBP51 proteolysis targeting chimera (PROTAC) that enables degradation of FKBP51 abolishing its scaffolding function. Initial synthesis of 220 FKBP‐focused PROTACs yielded a plethora of active PROTACs for FKBP12, six for FKBP51, and none for FKBP52. Structural analysis of a binary FKBP12:PROTAC complex revealed the molecular basis for negative cooperativity. Linker‐based optimization of first generation FKBP51 PROTACs led to the PROTAC SelDeg51 with improved cellular activity, selectivity, and high cooperativity. The structure of the ternary FKBP51:SelDeg51:VCB complex revealed how SelDeg51 establishes cooperativity by dimerizing FKBP51 and the von Hippel‐Lindau protein (VHL) in a glue‐like fashion. SelDeg51 efficiently depletes FKBP51 and reactivates glucocorticoid receptor (GR)‐signalling, highlighting the enhanced efficacy of full protein degradation compared to classical FKBP51 binding. The FK506‐binding site of FK506‐binding protein 51 (FKBP51) is chemically tractable but not required for glucocorticoid receptor (GR) repression by FKBP51. The proteolysis targeting chimera SelDeg51 enables degradation of FKBP51, abolishes its scaffolding functions, and reactivates GR signaling.