Journal
BIOPHYSICAL JOURNAL
Volume 99, Issue 11, Pages 3684-3695Publisher
CELL PRESS
DOI: 10.1016/j.bpj.2010.09.067
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Funding
- National Institutes of Health [NS21501, AR44420, RR19895]
- National Science Foundation [GM068625]
- Landesstiftung Baden Wurttemberg foundation
- German National Academic Foundation
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Hidden Markov models (HMMs) provide an excellent analysis of recordings with very poor signal/noise ratio made from systems such as ion channels which switch among a few states This method has also recently been used for modeling the kinetic rate constants of molecular motors where the observable variable the position steadily accumulates as a result of the motor s reaction cycle We present a new HMM implementation for obtaining the chemical kinetic model of a molecular motor's reaction cycle called the variable stepsize HMM in which the quantized position variable is represented by a large number of states of the Markov model Unlike previous methods the model allows for arbitrary distributions of step sizes and allows these distributions to be estimated The result is a robust algorithm that requires little or no user input for characterizing the stepping kinetics of molecular motors as recorded by optical techniques
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