Microoxen: microorganisms to move microscale loads.
It is difficult to harness the power generated by biological motors to carry out mechanical work in systems outside the cell. Efforts to capture the mechanical energy of nanomotors ex vivo require in vitro reconstitution of motor proteins and, often, protein engineering. This study presents a method for harnessing the power produced by biological motors that uses intact cells. The unicellular, biflagellated algae Chlamydomonas reinhardtii serve as "microoxen." This method uses surface chemistry to attach loads (1- to 6-microm-diameter polystyrene beads) to cells, phototaxis to steer swimming cells, and photochemistry to release loads. These motile microorganisms can transport microscale loads (3-microm-diameter beads) at velocities of approximately 100-200 microm.sec(-1) and over distances as large as 20 cm.
Weibel
Douglas B
DB
Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA.
Garstecki
Piotr
P
Ryan
Declan
D
DiLuzio
Willow R
WR
Mayer
Michael
M
Seto
Jennifer E
JE
Whitesides
George M
GM
D000818:Animals; D001692:Biological Transport / Q000502:physiology; D055592:Biophysical Phenomena; D001703:Biophysics; D016825:Chlamydomonas reinhardtii / Q000502:physiology*; D008863:Microspheres; D020409:Molecular Motor Proteins / Q000502:physiology*; D009068:Movement; D010777:Photochemistry / Q000379:methods; D015202:Protein Engineering / Q000379:methods*
D020409:Molecular Motor Proteins