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  • Title: The 3D structure of villin as an unusual F-Actin crosslinker.
    Author: Hampton CM, Liu J, Taylor DW, DeRosier DJ, Taylor KA.
    Journal: Structure; 2008 Dec 10; 16(12):1882-91. PubMed ID: 19081064.
    Abstract:
    Villin is an F-actin nucleating, crosslinking, severing, and capping protein within the gelsolin superfamily. We have used electron tomography of 2D arrays of villin-crosslinked F-actin to generate 3D images revealing villin's crosslinking structure. In these polar arrays, neighboring filaments are spaced 125.9 +/- 7.1 A apart, offset axially by 17 A, with one villin crosslink per actin crossover. More than 6500 subvolumes containing a single villin crosslink and the neighboring actin filaments were aligned and classified to produce 3D subvolume averages. Placement of a complete villin homology model into the average density reveals that full-length villin binds to different sites on F-actin from those used by other actin-binding proteins and villin's close homolog gelsolin.
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