Identifying diffusive motions in single-particle trajectories on the plasma membrane via fractional time-series models

Physical Review. E
Krzysztof BurneckiDiego Krapf

Abstract

In this paper we show that an autoregressive fractionally integrated moving average time-series model can identify two types of motion of membrane proteins on the surface of mammalian cells. Specifically we analyze the motion of the voltage-gated sodium channel Nav1.6 and beta-2 adrenergic receptors. We find that the autoregressive (AR) part models well the confined dynamics whereas the fractionally integrated moving average (FIMA) model describes the nonconfined periods of the trajectories. Since the Ornstein-Uhlenbeck process is a continuous counterpart of the AR model, we are also able to calculate its physical parameters and show their biological relevance. The fitted FIMA and AR parameters show marked differences in the dynamics of the two studied molecules.

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Citations

Feb 12, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Boris I GodoySean B Andersson
Mar 20, 2021·Analytica Chimica Acta·Daniel F Kienle, Daniel K Schwartz

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