What question did this study set out to answer?

To determine whether vinculin directly binds to actin filaments in the absence of contaminating actin-binding proteins.

February 8, 1988FEBS Letters

Evidence for direct binding of vinculin to actin filaments

View Full Paper

Ask AI

Bookmark

Authors

Direct vinculin-actin binding is confirmed in vitro; leaves open its functional role in cardiac cytoskeletal dynamics pending cellular studies.

To determine whether vinculin directly binds to actin filaments in the absence of contaminating actin-binding proteins.
Separated vinculin on SDS-polyacrylamide gels, blotted onto nitrocellulose, and probed with fluorescently labeled polymeric actin (100 mM KCl, 2 mM MgCl2).
Conducted cosedimentation assays using vinculin purified from alpha-actinin and actin polymerization-inhibiting protein HA1, followed by competitive displacement with tropomyosin.
Vinculin directly cosedimented with polymeric actin with a maximal binding stoichiometry of one vinculin molecule per 100 actin filament subunits.
Half-maximal binding of vinculin to actin filaments was observed at approximately 0.25 µM free vinculin.
Addition of tropomyosin effectively displaced bound vinculin from actin filaments.

Ruhnau et al. (1988) studied this question.

View Full Paper

Ask AI

Bookmark

Direct vinculin-actin binding is confirmed in vitro; leaves open its functional role in cardiac cytoskeletal dynamics pending cellular studies.