Nanoshuttle Wear and Tear (image) Columbia University School of Engineering and Applied Science Share Print E-Mail Caption Molecular shuttles are a nanoscale transport system in which microtubules (acting as cargo carriers) are propelled by surface-adhered kinesin motor proteins. Researchers have found that as the microtubules are propelled by the kinesin motors, tubulin subunits are removed from the leading end. Credit Coneyl Jayasinhe for Columbia Engineering Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.