Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
A biomolecular motor exploits a rigid-to-flexible transition of a protein tether, which allows thermal fluctuations to draw together vesicle membranes. This entropic motor helps traffic material into and around cells.
A molecular motor for cellular delivery and sorting