ジャーナル: Commun Chem / 年: 2024 タイトル: Mechanistic insights into a heterobifunctional degrader-induced PTPN2/N1 complex. 著者: Qi Hao / Manoj K Rathinaswamy / Kelly L Klinge / Matthew Bratkowski / Amirhossein Mafi / Christina K Baumgartner / Keith M Hamel / Gesine K Veits / Rinku Jain / Claudio Catalano / Mark ...著者: Qi Hao / Manoj K Rathinaswamy / Kelly L Klinge / Matthew Bratkowski / Amirhossein Mafi / Christina K Baumgartner / Keith M Hamel / Gesine K Veits / Rinku Jain / Claudio Catalano / Mark Fitzgerald / Alexander W Hird / Eunice Park / Harit U Vora / James A Henderson / Kenton Longenecker / Charles W Hutchins / Wei Qiu / Giovanna Scapin / Qi Sun / Vincent S Stoll / Chaohong Sun / Ping Li / Dan Eaton / David Stokoe / Stewart L Fisher / Christopher G Nasveschuk / Marcia Paddock / Michael E Kort / 要旨: PTPN2 (protein tyrosine phosphatase non-receptor type 2, or TC-PTP) and PTPN1 are attractive immuno-oncology targets, with the deletion of Ptpn1 and Ptpn2 improving response to immunotherapy in ...PTPN2 (protein tyrosine phosphatase non-receptor type 2, or TC-PTP) and PTPN1 are attractive immuno-oncology targets, with the deletion of Ptpn1 and Ptpn2 improving response to immunotherapy in disease models. Targeted protein degradation has emerged as a promising approach to drug challenging targets including phosphatases. We developed potent PTPN2/N1 dual heterobifunctional degraders (Cmpd-1 and Cmpd-2) which facilitate efficient complex assembly with E3 ubiquitin ligase CRL4, and mediate potent PTPN2/N1 degradation in cells and mice. To provide mechanistic insights into the cooperative complex formation introduced by degraders, we employed a combination of structural approaches. Our crystal structure reveals how PTPN2 is recognized by the tri-substituted thiophene moiety of the degrader. We further determined a high-resolution structure of DDB1-CRBN/Cmpd-1/PTPN2 using single-particle cryo-electron microscopy (cryo-EM). This structure reveals that the degrader induces proximity between CRBN and PTPN2, albeit the large conformational heterogeneity of this ternary complex. The molecular dynamic (MD)-simulations constructed based on the cryo-EM structure exhibited a large rigid body movement of PTPN2 and illustrated the dynamic interactions between PTPN2 and CRBN. Together, our study demonstrates the development of PTPN2/N1 heterobifunctional degraders with potential applications in cancer immunotherapy. Furthermore, the developed structural workflow could help to understand the dynamic nature of degrader-induced cooperative ternary complexes.