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- W2079118917 abstract "Molecular spiders are synthetic molecular motors featuring multiple legs such that each leg can interact with a substrate through binding and cleavage. Experimental studies of molecular spiders suggest that the motion of the spider on both a substrate matrix [R. Pei et al., J. Amer. Chem. Soc.128, 12693 (2006)] and a two dimensional substrate track [K. Lund et al, Nature 465, 206 (2010)] is biased towards uncleaved substrates. We first investigated the origin of the spider's biased motion by using Monte Carlo simulations of bipedal spiders on a 1D track based on a realistic chemical kinetic model [L. Samii et al., Phys. Rev. E81, 021106-1 (2010)], and found that substrate cleavage and spider detachment from the track both contribute to biased motion of the spider population. In the work reported here, we extend these studies by investigating how experimental parameters such as number of legs, leg length and substrate cleavage rate can be tuned to optimize the motor properties of the spider. We find that each of these parameters affect properties such as binding time to the track, processivity and speed in different ways. To evaluate further the motor properties of the spider, we calculated the thermodynamic efficiencies of multi-pedal molecular spiders, and found that they are both force and time dependent. By comparing our results with biological molecular motors such as kinesin, we were able to comment on the effect of tight versus loose mechano-chemical coupling on thermodynamic efficiency." @default.
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- W2079118917 date "2011-02-01" @default.
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- W2079118917 title "Motor Properties of Molecular Spiders" @default.
- W2079118917 doi "https://doi.org/10.1016/j.bpj.2010.12.1863" @default.
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