Background:Fascin is the main actin-bundling protein in filopodia. Results: Biochemical, cryo-electron tomographic, and x-ray crystal structural data reveal the unique actin-binding characteristics of fascin. Conclusion: There are two major actin-binding sites on fascin and there is a concerted conformational change between the actin-binding sites. Significance: These data will advance our understanding of the function of fascin in filopodial formation.
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