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Fyn-Saracatinib Complex Structure Reveals an Active State-like Conformation
Hai Minh Ta1, Banumathi Sankaran2, Eric D Roush3
1Verna and Marrs McLean Department of Biochemistry and Molecular Pharmacology, Baylor College of Medicine, Houston, TX 77030, USA.
International Journal of Molecular Sciences
|February 13, 2026
Summary
Saracatinib binds the Fyn kinase domain with low-nanomolar affinity. Structural analysis reveals an active-like conformation, offering insights for developing Fyn-selective inhibitors for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Fyn kinase is crucial in neuroinflammation and synaptic dysfunction in Alzheimer's and Parkinson's diseases.
- Saracatinib, a Src-family inhibitor, shows potential but lacks kinase selectivity due to conserved ATP-binding sites.
Purpose of the Study:
- To structurally define saracatinib's interaction with the Fyn kinase domain.
- To provide a basis for designing Fyn-selective inhibitors.
Main Methods:
- Surface plasmon resonance (SPR) for binding kinetics.
- X-ray crystallography to determine the Fyn kinase domain-saracatinib complex structure.
Main Results:
- Saracatinib exhibits low-nanomolar affinity for Fyn kinase.
- The crystal structure reveals an active-like Fyn conformation with saracatinib bound.
- Saracatinib interacts with hinge and hydrophobic regions, with kinase-dependent αC-helix conformations.
Conclusions:
- The active-like Fyn conformation presents a unique pocket for inhibitor design.
- Structural insights facilitate the development of Fyn-selective inhibitors for neurodegenerative disorders.
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