  Gliding of microtubule filaments on surfaces coated with the motor protein
kinesin has potential applications for nano-scale devices. The ability to guide
the gliding direction in three dimensions allows the fabrication of tracks of
arbitrary geometry in space. Here, we achieve this by using kinesin-coated
glass wires of micrometer diameter range. Unlike previous methods in which the
guiding tracks are fixed on flat two-dimensional surfaces, the flexibility of
glass wires in shape and size facilitates building in-vitro devices that have
deformable tracks.
