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http://dx.doi.org/10.12925/jkocs.2008.25.3.14

A Study On Structure Change of Binding Actin and Moysin On The Contracting Muscle Membrane  

Kim, Duck-Sool (Department of Biomedical Engineering Tongmyong University)
Park, Keun-Ho (Department of Chemical Technology, Changwon National University)
Publication Information
Journal of the Korean Applied Science and Technology / v.25, no.3, 2008 , pp. 380-387 More about this Journal
Abstract
The effects of the applied stretch and MgADP binding on the structure of the actin and myosin cross-bridges in rabbit fibers in the rigor state have been investigatedwith improved resolution by x-ray diffraction using synchrotron radiation. To clarify the structure of the ATP hydrolysis intermediates formed by actin and myosin cross-bridges,the effects of various phosphate analogs in the of MgADP on the structure of the thin and thick filaments in glycerinated rabbit muscle fibers in the rigor state investigated by x-ray diffraction with a short exposure time using synchrotron radiation. These results strongly suggest that when MgADP and phosphate analogs such as metallofluorides(BeF3 and AlF4)and vanadate(VO4(Vi)) were added the rigor fibers in the presence of the ATP-depletion backup system, the intensities of the actin-based layer lines were markedly weakened. We found that the intensity of the 14.5 nm-based meridional reflections increase by 20-50% when phosphate analogs such as metallofluorides(BeF3 and AlF4) and vanadate(VO4(Vi)) was added to the rigor muscle.
Keywords
metallofluorides; vanadate; x-ray diffraction; ATP hydrolysis;
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