Mechanically operated signalling scaffold

Mechanically operated signalling scaffolds are a class of non-enzymatic proteins integrated into the cell's cytoskeletal architecture, such as talin with its 13 force-dependent binary switch domains, that organize signalling pathway components in space and time to control cellular responses to mechanical and chemical signals.[1] These scaffolds use mechanical hysteresis—where domains unfold at high tension (5-25 pN) but refold only at low tension (~4 pN)—to create persistent switch patterns that relocate enzymes like kinases and phosphatases relative to substrates, enabling quantised ~50 nm positional changes and mechanomemory.[1] They couple actomyosin contractility from integrin adhesions to signalling outputs, such as displacing CDK1 upon unfolding to recruit vinculin, thus coordinating sub-cellular localization and balancing opposing signals for homeostasis.[1] In disease, mutations disrupt these scaffolds, leading to constitutive signalling in cancer or synaptic dysregulation in neurodegenerative conditions like Alzheimer's and Parkinson's via ECM stiffening or loss of mechanical homeostasis.[1] Unlike traditional scaffolds, they dynamically integrate mechanical forces with pathways like MAPK or EGFR, providing whole-cell synchronization without known therapeutic drugs targeting them directly.[1][5]

Other names

signalling scaffoldmechanical scaffoldmechanosensitive scaffoldtalin (exemplar protein)