Key Points
- To examine the binding kinetics and interaction mechanisms of intact talin and its head and tail fragments with filamentous actin under low ionic strength at pH 7.0.
- Measured binding kinetics between F-actin and talin variants (intact, head fragment, and tail fragment) using transient kinetic methods at pH 7.0.
- Assessed filament cross-linking and internal actin dynamics using static and dynamic light scattering.
- Intact talin and the talin tail fragment exhibited a biphasic binding process consisting of an initial fast phase followed by a slower bundling and cross-linking phase.
- Dynamic light scattering revealed alterations in internal actin filament dynamics driven by cross-linking with intact talin and the tail fragment.
- Talin head fragment showed no detectable binding to F-actin in either kinetic or light scattering assays.
Structured PICO
PPopulationIn vitro model of F-actin and talin (intact, head, and tail fragments)
IInterventionBinding kinetics assessment at pH 7.0 and low ionic strength using static and dynamic light scattering
OOutcomeBinding kinetics and cross-linking/bundling of talin with F-actinsurrogate
Intact talin and its tail fragment, but not the head fragment, bind to and cross-link/bundle F-actin in vitro.