Highly conserved talin isoforms encode distinct mechanical responses and ligand-binding capabilities

Talin-2 preserves talin-1’s overall rod mechanical architecture but shows distinct unfolding and force thresholds, including lower-force R9 unfolding and a new cooperative R7–R9 pathway.

• Why it matters: Isoform-specific talin functions are nonredundant, yet how talin-1 versus talin-2 sequence differences reshape mechanosensitive behavior and ligand-binding is unclear.
• What they did: Single-molecule force spectroscopy and biochemical binding assays compared talin-1 and talin-2 rod regions, mapping unfolding pathways in R7–R9 and R9, and testing ligand recruitment sites.
• The result: Talin-2 R7–R9 unfolds via a previously unobserved three-domain cooperative pathway, and R9 unfolds at substantially lower force than in talin-1; talin-2 R4–R6 gains a vinculin-binding site in R5 and an AKAP region in R5–R6 recruiting PKA, adding two spatially separated, mechanically regulated PKA-anchoring regions.

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