Abstract
Image analysis of isolated F-actin filaments shows that the actin helix can be described by a constant rise per subunit but a considerably variable and randomized twist (number of units per turn). The ability of actin subunits to rotate through angles of the order of 10° from their helically ideal positions helps to explain actin's capacity to form many different polymorphic structures.
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Egelman, E., Francis, N. & DeRosier, D. F-actin is a helix with a random variable twist. Nature 298, 131–135 (1982). https://doi.org/10.1038/298131a0
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DOI: https://doi.org/10.1038/298131a0
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