Actin–tubulin protein–protein interface (Actin–tubulin PPI)

The actin–tubulin protein–protein interface represents the critical site of crosstalk between the two primary components of the eukaryotic cytoskeleton: microfilaments and microtubules. This interface is not only characterized by direct physical contact between actin and tubulin subunits but is also mediated by a variety of crosslinking proteins such as microtubule-actin cross-linking factor 1 (MACF1) and various motor proteins. Biologically, this interaction is essential for coordinating complex cellular processes including directed cell migration, spindle positioning during mitosis, and the maintenance of neuronal architecture. In disease states, particularly cancer, the dysregulation of this interface facilitates epithelial-to-mesenchymal transition and metastatic invasion by allowing cells to dynamically reshape their structure. While traditional therapies have targeted actin or tubulin individually, emerging pharmacological strategies aim to modulate the interface itself to achieve higher specificity and reduce the systemic toxicity associated with total cytoskeletal disruption. Drugs that interfere with this coupling can effectively arrest cell division and inhibit the migratory capacity of highly invasive tumor cells.

Other names

Actin-microtubule interfaceCytoskeletal crosstalk interfaceActin-tubulin interaction site

Disruption of the physical and functional coupling between actin microfilaments and microtubules, leading to impaired cellular structural integrity and inhibited intracellular transport or division.