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• W3100236587 endingPage "056006" @default.
• W3100236587 startingPage "056006" @default.
• W3100236587 abstract "In cells and in vitro assays the number of motor proteins involved in biological transport processes is far from being unlimited. The cytoskeletal binding sites are in contact with the same finite reservoir of motors (either the cytosol or the flow chamber) and hence compete for recruiting the available motors, potentially depleting the reservoir and affecting cytoskeletal transport. In this work we provide a theoretical framework to study, analytically and numerically, how motor density profiles and crowding along cytoskeletal filaments depend on the competition of motors for their binding sites. We propose two models in which finite processive motor proteins actively advance along cytoskeletal filaments and are continuously exchanged with the motor pool. We first look at homogeneous reservoirs and then examine the effects of free motor diffusion in the surrounding medium. We consider as a reference situation recent in vitro experimental setups of kinesin-8 motors binding and moving along microtubule filaments in a flow chamber. We investigate how the crowding of linear motor proteins moving on a filament can be regulated by the balance between supply (concentration of motor proteins in the flow chamber) and demand (total number of polymerised tubulin heterodimers). We present analytical results for the density profiles of bound motors, the reservoir depletion, and propose novel phase diagrams that present the formation of jams of motor proteins on the filament as a function of two tuneable experimental parameters: the motor protein concentration and the concentration of tubulins polymerized into cytoskeletal filaments. Extensive numerical simulations corroborate the analytical results for parameters in the experimental range and also address the effects of diffusion of motor proteins in the reservoir." @default.
• W3100236587 created "2020-11-23" @default.
• W3100236587 creator A5004472589 @default.
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• W3100236587 date "2014-09-10" @default.
• W3100236587 modified "2023-10-11" @default.
• W3100236587 title "Motor protein traffic regulation by supply–demand balance of resources" @default.
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• W3100236587 doi "https://doi.org/10.1088/1478-3975/11/5/056006" @default.
• W3100236587 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25204752" @default.
• W3100236587 hasPublicationYear "2014" @default.
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