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Nano production lines
22 August 2007
Researchers in Switzerland have built nanoscale cargo loading stations and shuttles, an important step towards assembly lines for nanotechnology.
Biological assembly lines consist of kinesin proteins which carry cargo, like organelles or vesicles, and literally walk along microtubules. However, as far as man-made systems go, 'nothing comparable to a macroscopic assembly line exists at the nanoscale,' according to Viola Vogel of the Department of Materials at the Swiss Federal Institute of Technology (ETH) in Zurich. 'Imagine if you wanted to build a car by fabricating all of its components, putting them in a glass full of water and hoping that they would self-assemble spontaneously into the finished car.'
The challenge is to tune the interactions in the system so that the cargo remains stuck to the station when not needed, but can be picked up easily by the shuttle. As a test of principle, Vogel and colleagues used gold nanoparticles coated in anti-biotin antibodies as cargo, and compared loading stations made of biotin-tipped DNA with biotin-tipped polyethylene glycol. Biotinylated microtubules, powered by kinesin motors, act as shuttles rather than conveyor belts, as they do in cells.
- Viola Vogel, Swiss Federal Institute of Technology
'Future challenges will be to combine the main components of a transport system: pick-up of cargo from defined locations, guided transport, and controlled discharge of the load at the final destination,' commented Vogel. She went on to caution: 'The problems are always in the details of working through the engineering challenges of interfacing biological molecules with synthetic devices.'
Link to journal article
Cargo pick-up from engineered loading stations by kinesin driven molecular shuttles
Christian Brunner, Christian Wahnes and Viola Vogel, Lab Chip, 2007, 7, 1263