The present invention relates to fusion polypeptides including (a) a
binding site for a cytoskeleton component and (b.sub.1) an effector
protein or the catalytic domain thereof or (b.sub.2) a binding site for
the effector protein, and nucleic acid sequences encoding the fusion
polypeptides. Moreover, various therapeutic uses of the fusion
polypeptides are described, e.g., the treatment of diseases associated
with the presence of an aberrant cell population, preferably cancer or
AIDS.