8SC9 image
Entry Detail
PDB ID:
8SC9
Title:
Structure of PPARG in complex with MTX-531
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-04-05
Release Date:
2024-06-12
Method Details:
Experimental Method:
Resolution:
1.86 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peroxisome proliferator-activated receptor gamma
Chain IDs:A, B
Chain Length:278
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
A first-in-class selective inhibitor of EGFR and PI3K offers a single-molecule approach to targeting adaptive resistance.
Nat Cancer 5 1250 1266 (2024)
PMID: 38992135 DOI: 10.1038/s43018-024-00781-6

Abstact

Despite tremendous progress in precision oncology, adaptive resistance mechanisms limit the long-term effectiveness of molecularly targeted agents. Here we evaluated the pharmacological profile of MTX-531 that was computationally designed to selectively target two key resistance drivers, epidermal growth factor receptor and phosphatidylinositol 3-OH kinase (PI3K). MTX-531 exhibits low-nanomolar potency against both targets with a high degree of specificity predicted by cocrystal structural analyses. MTX-531 monotherapy uniformly resulted in tumor regressions of squamous head and neck patient-derived xenograft (PDX) models. The combination of MTX-531 with mitogen-activated protein kinase kinase or KRAS-G12C inhibitors led to durable regressions of BRAF-mutant or KRAS-mutant colorectal cancer PDX models, resulting in striking increases in median survival. MTX-531 is exceptionally well tolerated in mice and uniquely does not lead to the hyperglycemia commonly seen with PI3K inhibitors. Here, we show that MTX-531 acts as a weak agonist of peroxisome proliferator-activated receptor-γ, an attribute that likely mitigates hyperglycemia induced by PI3K inhibition. This unique feature of MTX-531 confers a favorable therapeutic index not typically seen with PI3K inhibitors.

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