9EQM
Crystal structure of pVHL:EloB:EloC in complex with MP-1-21
This is a non-PDB format compatible entry.
Summary for 9EQM
| Entry DOI | 10.2210/pdb9eqm/pdb |
| Related | 9EQJ |
| Descriptor | Elongin-B, Elongin-C, von Hippel-Lindau disease tumor suppressor, ... (5 entities in total) |
| Functional Keywords | e3 ligase, von hippel-lindau tumor-suppressor protein, ligase |
| Biological source | Homo sapiens (human) More |
| Total number of polymer chains | 3 |
| Total formula weight | 42155.28 |
| Authors | |
| Primary citation | Pierri, M.,Liu, X.,Kroupova, A.,Rutter, Z.,Hallatt, A.J.,Ciulli, A. Stereochemical inversion at a 1,4-cyclohexyl PROTAC linker fine-tunes conformation and binding affinity. Bioorg.Med.Chem.Lett., 110:129861-129861, 2024 Cited by PubMed Abstract: Proteolysis targeting chimeras (PROTACs) are heterobifunctional small-molecule degraders made of a linker connecting a target-binding moiety to a ubiquitin E3 ligase-binding moiety. The linker unit is known to influence the physicochemical and pharmacokinetic properties of PROTACs, as well as the properties of ternary complexes, in turn impacting on their degradation activity in cells and in vivo. Our LRRK2 PROTAC XL01126, bearing a trans-cyclohexyl group in the linker, is a better and more cooperative degrader than its corresponding cis- analogue despite its much weaker binary binding affinities. Here, we investigate how this subtle stereocenter alteration in the linker affects the ligand binding affinity to the E3 ligase VHL. We designed a series of molecular matched pairs, truncating from the full PROTACs down to the VHL ligand, and find that across the series the trans-cyclohexyl compounds showed consistently weaker VHL-binding affinity compared to the cis- counterparts. High-resolution co-crystal structures revealed that the trans linker exhibits a rigid stick-out conformation, while the cis linker collapses into a folded-back conformation featuring a network of intramolecular contacts and long-range interactions with VHL. These observations are noteworthy as they reveal how a single stereochemical inversion within a PROTAC linker impacts conformational rigidity and binding mode, in turn fine-tuning differentiated propensity to binary and ternary complex formation, and ultimately cellular degradation activity. PubMed: 38942127DOI: 10.1016/j.bmcl.2024.129861 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.19 Å) |
Structure validation
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