Molecular motors
are pivotal for intracellular transport as well
as cell motility and have great potential to be put to use outside
cells. Here, we exploit engineered motor proteins in combination with
self-assembly of actin filaments to actively pull lipid nanotubes
from giant unilamellar vesicles (GUVs). In particular, actin filaments
are bound to the outer GUV membrane and the GUVs are seeded on a heavy
meromyosin-coated substrate. Upon addition of ATP, hollow lipid nanotubes
with a length of tens of micrometer are pulled from single GUVs due
to the motor activity. We employ the same mechanism to pull lipid
nanotubes from different types of cells. We find that the length and
number of nanotubes critically depends on the cell type, whereby suspension
cells form bigger networks than adherent cells. This suggests that
molecular machines can be used to exert forces on living cells to
probe membrane-to-cortex attachment.
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