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A model for the chemomechanical coupling of the mammalian cytoplasmic dynein molecular motor

  • Ping XieEmail author
Original Article
  • 43 Downloads

Abstract

Available single-molecule data have shown that some mammalian cytoplasmic dynein dimers move on microtubules with a constant step size of about 8.2 nm. Here, a model is presented for the chemomechanical coupling of these mammalian cytoplasmic dynein dimers. In contrast to the previous models, a peculiar feature of the current model is that the rate constants of ATPase activity are independent of the external force. Based on this model, analytical studies of the motor dynamics are presented. With only four adjustable parameters, the theoretical results reproduce quantitatively diverse available single-molecule data on the force dependence of stepping ratio, velocity, mean dwell time, and dwell-time distribution between two mechanical steps. Predicted results are also provided for the force dependence of the number of ATP molecules consumed per mechanical step, indicating that under no or low force the motors exhibit a tight chemomechanical coupling, and as the force increases the number of ATPs consumed per step increases greatly.

Keywords

Molecular motor Dynein Mechanochemistry Dynamics Model 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant no. 11775301).

Supplementary material

249_2019_1386_MOESM1_ESM.pdf (156 kb)
Supplementary material 1 (PDF 156 kb)

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Copyright information

© European Biophysical Societies' Association 2019

Authors and Affiliations

  1. 1.Key Laboratory of Soft Matter Physics, Institute of PhysicsChinese Academy of SciencesBeijingChina

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