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Chin. Phys. B, 2018, Vol. 27(11): 118702    DOI: 10.1088/1674-1056/27/11/118702
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Mechanochemical model for myosin II dimer that can explain the spontaneous oscillatory contraction of muscle

Wei Sun(孙伟)1,2, Xiao-Yang Zhao(赵晓阳)3,4, Jun-Ping Zhang(张俊萍)1, Tala(塔拉)1, Wei-Sheng Guo(郭维生)1
1 School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China;
2 Department of Resource Engineering, Ordos Vocational College, Ordos 017000, China;
3 Department of Statistics and Mathematics, Inner Mongolia University of Finance and Economics, Hohhot 010070, China;
4 Inner Mongolia Vocational College of Chemical Engineering, Hohhot 010070, China
Abstract  

The spontaneous oscillatory contraction (SPOC) of myofibrils is the essential property inherent to the contractile system of muscle. Muscle contraction results from cyclic interactions between actin filament and myosin Ⅱ which is a dimeric motor protein with two heads. Taking the two heads of myosin Ⅱ as an indivisible element and considering the effects of cooperative behavior between the two heads on rate constants in the mechanochemical cycle, the present work proposes the tenstate mechanochemical cycle model for myosin Ⅱ dimer. The simulations of this model show that the proportion of myosin Ⅱ in different states periodically changes with time, which results in the sustained oscillations of contractive tension, and serves as the primary factor for SPOC. The good fit of this model to experimental results suggests that the cooperative interaction between the two heads of myosin Ⅱ dimer may be one of the underlying mechanisms for muscle contraction.

Keywords:  muscle contraction      spontaneous oscillatory contraction (SPOC)      mechanochemical cycle      cooperative behavior  
Received:  15 June 2018      Revised:  03 September 2018      Accepted manuscript online: 
PACS:  87.15.R- (Reactions and kinetics)  
  87.15.A- (Theory, modeling, and computer simulation)  
  82.39.-k (Chemical kinetics in biological systems)  
Fund: 

Project supported by Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region, China (Grant Nos. NJZY16493 and NJZC17458).

Corresponding Authors:  Wei-Sheng Guo     E-mail:  pygws@imu.edu.cn

Cite this article: 

Wei Sun(孙伟), Xiao-Yang Zhao(赵晓阳), Jun-Ping Zhang(张俊萍), Tala(塔拉), Wei-Sheng Guo(郭维生) Mechanochemical model for myosin II dimer that can explain the spontaneous oscillatory contraction of muscle 2018 Chin. Phys. B 27 118702

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