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  5. Quasi-steady state reduction of molecular motor-based models of directed intermittent search
 
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Quasi-steady state reduction of molecular motor-based models of directed intermittent search
File(s)
bmb2.pdf (426.59 KB)
Accepted version
Author(s)
Newby, Jay M
Bressloff, Paul C
Type
Journal Article
Abstract
We present a quasi-steady state reduction of a linear reaction-hyperbolic master equation describing the directed intermittent search for a hidden target by a motor-driven particle moving on a one-dimensional filament track. The particle is injected at one end of the track and randomly switches between stationary search phases and mobile nonsearch phases that are biased in the anterograde direction. There is a finite possibility that the particle fails to find the target due to an absorbing boundary at the other end of the track. Such a scenario is exemplified by the motor-driven transport of vesicular cargo to synaptic targets located on the axon or dendrites of a neuron. The reduced model is described by a scalar Fokker–Planck (FP) equation, which has an additional inhomogeneous decay term that takes into account absorption by the target. The FP equation is used to compute the probability of finding the hidden target (hitting probability) and the corresponding conditional mean first passage time (MFPT) in terms of the effective drift velocity V, diffusivity D, and target absorption rate λ of the random search. The quasi-steady state reduction determines V, D, and λ in terms of the various biophysical parameters of the underlying motor transport model. We first apply our analysis to a simple 3-state model and show that our quasi-steady state reduction yields results that are in excellent agreement with Monte Carlo simulations of the full system under physiologically reasonable conditions. We then consider a more complex multiple motor model of bidirectional transport, in which opposing motors compete in a “tug-of-war”, and use this to explore how ATP concentration might regulate the delivery of cargo to synaptic targets.
Date Issued
2010-10
Date Acceptance
2010-01-29
Citation
Bulletin of Mathematical Biology, 2010, 72 (7), pp.1840-1866
URI
http://hdl.handle.net/10044/1/107538
URL
http://dx.doi.org/10.1007/s11538-010-9513-8
DOI
https://www.dx.doi.org/10.1007/s11538-010-9513-8
ISSN
0092-8240
Publisher
Springer
Start Page
1840
End Page
1866
Journal / Book Title
Bulletin of Mathematical Biology
Volume
72
Issue
7
Copyright Statement
Copyright © 2010 Springer-Verlag. This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s11538-010-9513-8
Identifier
http://dx.doi.org/10.1007/s11538-010-9513-8
Publication Status
Published
Date Publish Online
2010-02-19
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