Talin-1 interaction network in cellular mechanotransduction (Review)

The mechanical signals within the extracellular matrix (ECM) regulate cell growth, proliferation and differentiation, and integrins function as the hub between the ECM and cellular actin. Focal adhesions (FAs) are multi-protein, integrin-containing complexes, acting as tension-sensing anchoring points that bond cells to the extracellular microenvironment. Talin-1 serves as the central protein of FAs that participates in the activation of integrins and connects them with the actin cytoskeleton. As a cytoplasmic protein, Talin-1 consists of a globular head domain and a long rod comprised of a series of alpha-helical bundles. The unique structure of the Talin-1 rod domain permits folding and unfolding in response to the mechanical stress, revealing various binding sites. Thus, conformation changes of the Talin-1 rod domain enable the cell to convert mechanical signals into chemical through multiple signaling pathways. The present review discusses the binding partners of Talin-1, their interactions, effects on the cellular processes, and their possible roles in diseases.