A newly published study is changing our understanding of how the protein talin functions at sites where cells attach to their surroundings. The findings uncover a previously unknown mechanism by which mechanical force regulates talin, a key protein controlling cell adhesion and mechanosensing.
Talin plays a central role in both cell adhesion and the sensing of mechanical forces such as pressure and stretching. Tampere University’s researchers found that a region of the talin protein previously thought to bind integrins, the adhesion proteins located in the cell membrane, is more likely to serve as a site where talin molecules bind to one another under mechanical load. The findings challenge previous assumptions about this region of talin and suggest that force-dependent talin self-association may represent an important aspect of its biological function
“When mechanical force is applied to talin, its structure changes. This exposes a previously hidden region known as the Aggregation Prone Region, or APR, enabling talin molecules to bind to one another. This, in turn, recruits additional talin molecules to adhesion sites and may contribute to the reinforcement of adhesive structures.” says doctoral researcher Mahmudul Tanvir from the Protein Dynamics research group at Tampere University.
As mechanical load increases, this mechanism may help cells to reinforce their attachment to their surroundings and adapt to changing conditions. The study also identifies a previously unrecognised role for vinculin, a key component of the cellular adhesion machinery, as a “mechano-chaperone” that can dismantle talin assemblies formed under force. The findings suggest that vinculin may help control the balance between assembly and disassembly of adhesion structures under mechanical load.
"Talin has served as a key model for understanding how cells sense mechanical forces in their environment, yet this study reveals an entirely new layer of force-dependent regulation. What makes these findings particularly exciting is that we uncovered a completely unexpected function in a region that had long been viewed through a different biological lens. At the same time, the work challenges previous assumptions and expands our understanding of talin biology. Discovering a new force-dependent mechanism in a protein that has been studied for decades highlights how even well-established biological models can still harbour unexpected biology waiting to be discovered," says Paula Turkki , Docent and Senior Research Fellow at Tampere University.
The findings provide fundamental new insights into how cells sense and respond to mechanical forces, information that may eventually inform future biomedical research.
“This could open new avenues of research into diseases in which cell adhesion, migration, or mechanical signalling are disrupted. These processes play important roles in cancer progression, wound healing, and the function of the heart, muscles and connective tissues,” Tanvir says.
The study was led by Professor Ben Goult 's laboratory at the University of Liverpool, in collaboration with researchers at Tampere University, the University of Cambridge, the University of Kent and the National University of Singapore. From Tampere University, Docent and Senior Research Fellow Paula Turkki, Mahmudul Hasn Tanvir and Professor Vesa Hytönen contributed to the study.
Proceedings of the National Academy of Sciences
An aggregation-prone region in talin controls talin self-interactions and regulates integrin adhesion complex dynamics
4-Nov-2026