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Article type: Research Article
Authors: Oosawa, Fumio
Affiliations: Department of Biophysical Engineering, Osaka University and Institute of Molecular Biology, Nagoya University, Japan
Note: [1] This paper is dedicated to Professor Shoten Oka with deep respect.
Abstract: Experimental data on the elastic modulus for bending of F-actin are summarized and the microscopic elastic constant of the actin-actin bond is estimated. The elastic modulus for bending is ca. 2 × 10−17 dyne cm2 and the microscopic elastic constant is ca. 2 × 104 dyne cm 1 in the physiological salt condition at room temperature. A profile of the interaction free energy is given as a function of the distance between actin monomers, and the thermodynamic property of the bond is discussed. Then, data are presented to show the conformational change of F-actin in the thin filament induced by Ca ion and by interaction with myosin or heavy meromyosin. Finally, the possibility that the conformations change of F-actin is involved in muscle contraction or cellular movement and its regulation is suggested.
DOI: 10.3233/BIR-1977-14102
Journal: Biorheology, vol. 14, no. 1, pp. 11-19, 1977
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