What is it about?
Proteins change shape depending on what they bind to, and this can hide important drug targets. In this study, we solved the first high-resolution structure of human TIMP-1 in its unbound state—meaning without any interacting partner. This reveals hidden pockets that are normally inaccessible in previously known structures. We also developed a robust crystal system that allows small molecules to be “soaked” into the protein, enabling fragment-based drug discovery. This provides a practical platform to discover new compounds targeting TIMP-1 in both cancer and multiple sclerosis.
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Why is it important?
TIMP-1 sits at the intersection of two major disease areas: cancer progression and brain repair. In cancer, it promotes tumor growth through CD63 signalling; in multiple sclerosis, it is linked to remyelination and recovery. Until now, drug discovery efforts were limited because no structure existed showing all druggable regions at once. By revealing these sites and proving they are experimentally accessible, this work removes a key bottleneck. It transforms TIMP-1 from a “difficult target” into a tractable one for both therapeutics and biomarker development.
Perspectives
This structure is not just descriptive—it is enabling. It opens the door to high-throughput fragment screening campaigns that can generate the first generation of TIMP-1 binders. In the short term, this could lead to chemical probes to better understand TIMP-1 biology. In the long term, it creates a foundation for two translational directions: inhibitors of TIMP-1–CD63 signalling in cancer, and imaging or therapeutic agents that track or promote remyelination in multiple sclerosis. More broadly, it highlights how capturing proteins in their unbound state can reveal hidden opportunities in drug discovery that were previously overlooked.
Ahmed Shemy
Associatie KU Leuven
Read the Original
This page is a summary of: The human TIMP-1 unbound structure provides a platform for fragment screening, Acta Crystallographica Section D Structural Biology, March 2026, International Union of Crystallography,
DOI: 10.1107/s2059798326001749.
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