Memoryless self-reinforcing directionality in endosomal active transport within living cells
- Univ. of Illinois, Urbana, IL (United States); University of Illinois
- Univ. of Illinois, Urbana, IL (United States)
- Univ. of Illinois, Urbana, IL (United States); IBS Center for Soft and Living Matter, UNIST, Ulsan (South Korea)
In contrast to Brownian transport, the active motility of microbes, cells, animals and even humans often follows another random process known as truncated Levy walk1,2. These stochastic motions are characterized by clustered small steps and intermittent longer jumps that often extend towards the size of the entire system. As there are repeated suggestions, although disagreement, that Levy walks have functional advantages over Brownian motion in random searching and transport kinetics3-8, their intentional engineering into active materials could be useful. Here, we show experimentally in the classic active matter system of intracellular trafficking9-15 that Brownian-like steps self-organize into truncated Levy walks through an apparent time-independent positive feedback such that directional persistence increases with the distance traveled persistently. A molecular model that allows the maximum output of the active propelling forces to fluctuate slowly fits the experiments quantitatively. Furthermore, our findings offer design principles for programming efficient transport in active materials.
- Research Organization:
- Univ. of Illinois, Urbana, IL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-02ER46019
- OSTI ID:
- 1252187
- Journal Information:
- Nature Materials, Journal Name: Nature Materials Journal Issue: 6 Vol. 14; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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