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. 1993 Nov;65(5):1878–1885. doi: 10.1016/S0006-3495(93)81252-9

Actin binding to lipid-inserted alpha-actinin.

M Fritz 1, R M Zimmermann 1, M Bärmann 1, H E Gaub 1
PMCID: PMC1225923  PMID: 8298017

Abstract

The interaction of alpha-actinin with lipid films and actin filaments was investigated. First alpha-actinin was incorporated in lipid films at the air/water interface. Injection of alpha-actinin into the subphase of a lipid monolayer led to a significant increase of the surface pressure only for lipid films consisting of a mixture of a negatively charged lipid with a high proportion of diacylglycerol. These alpha-actinin-containing films were transferred onto silanized quartz slides. Photobleaching experiments in the evanescent field allowed quantification of the lateral number density of the lipid-bound alpha-actinin. In combination with the area increase from the monolayer experiments, the photobleaching measurements suggest that alpha-actinin is incorporated into the lipid film in such a way that actin binding sites are accessible from the bulk phase. Binding experiments confirmed that the alpha-actinin selectively binds actin filaments in this configuration. We also showed that, in contrast to actin filaments which are adsorbed directly onto planar surfaces, the alpha-actinin-bound actin filaments are recognized and cleaved by the actin-severing protein gelsolin. Thus we have constructed an in vitro system which opens new ways for investigations of membrane-associated actin-binding proteins and of the physical behavior of actin filaments in the close neighborhood to membranes.

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Selected References

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