Fiber assembly and use thereof

A method of moving a fiber assembly, comprising:

• polymerizing tubulins in the presence of guanosine-5′-[α,β-methylene]triphosphate (GMPCPP) to form rigid microtubule fibers;
• associating the rigid microtubule fibers with nucleic acid fragments which crosslink the fibers to form a fiber assembly, and
• bringing the fiber assembly and adenosine triphosphate (ATP) into contact with each other on a substrate surface that is covered with motor proteins,
• wherein the fiber assembly includes a first fiber to which a first single-stranded nucleic acid fragment is bound, a second fiber to which a second single-stranded nucleic acid fragment is bound, and a third single-stranded nucleic acid fragment that includes a region complementary to the first single-stranded nucleic acid fragment and a region complementary to the second single-stranded nucleic acid fragment, and
• wherein the fiber assembly moves linearly using the chemical energy of the ATP.