Kinesin molecules transport cargo such as proteins inside the cell by walking unidirectionally along microtubule tracks. The chemical energy derived from the hydrolysis of individual adenosine triphosphate molecules converts into directed, stepwise motion. In near future we will use these biomolecular motors for molecular conveyor belts and forklifts for nanometer-scale manufacturing.
Image is from a wonderful movie "The Inner Life of a Cell" by BioVisions at Harvard University.
Toward Devices Powered by Biomolecular Motors (by Henry Hess - Science 312; pp. 860; May 2006)
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