What question did this study set out to answer?

To determine whether vinculin requires actin microfilament bundles to associate with plasma membrane focal contact sites.

June 1, 1983The Journal of Cell BiologyOpen Access

Actin-independent association of vinculin with the cytoplasmic aspect of the plasma membrane in cell-contact areas.

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To determine whether vinculin requires actin microfilament bundles to associate with plasma membrane focal contact sites.
Substrate-attached plasma membranes and detergent-permeabilized chick fibroblasts were treated with Physarum fragmin in the presence of calcium to selectively dismantle actin filaments.
Membranes were analyzed for the retention of native vinculin and other actin-associated proteins (alpha-actinin, tropomyosin, myosin, and filamin).
Rhodamine- or fluorescein-conjugated vinculin was incubated with untreated and actin-depleted membranes to assess focal contact binding affinity.
Fragmin treatment removed actin filaments along with alpha-actinin, tropomyosin, myosin, and filamin from membrane cytoplasmic faces, but left vinculin localization undisturbed.
Fluorescently conjugated vinculin bound specifically to focal contact sites regardless of whether actin had been enzymatically cleared, demonstrating actin-independent membrane association.

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Implication

In vitro study reveals actin-independent binding of vinculin at focal contacts in chick fibroblasts, highlighting intrinsic membrane-anchoring mechanisms.

Cite This Study

Avnur et al. (1983) studied this question.

synapsesocial.com/papers/6a1befed1567d2fc4d5f4997 https://doi.org/10.1083/jcb.96.6.1622

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Implication

In vitro study reveals actin-independent binding of vinculin at focal contacts in chick fibroblasts, highlighting intrinsic membrane-anchoring mechanisms.

Actin-independent association of vinculin with the cytoplasmic aspect of the plasma membrane in cell-contact areas.

Key Points

Discussion

Implication

Cite This Study

Actin-independent association of vinculin with the cytoplasmic aspect of the plasma membrane in cell-contact areas.

Key Points

Discussion

Implication

Cite This Study

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