[X-ray diffraction study of the molecular nature of the dependence of rigor tension developed by skinned rabbit psoas muscle on the ionic strength of the solution].
Molecular origin of the dependence of rigor tension developed by skinned rabbit psoas muscle on the value of ionic strength in rigorizing solution was studied by means of X-ray diffraction technique. It is shown that a deviation of the ionic strength from "normal" value (= 0.125) either to high (= 0.34) or to low (= 0.04) values is accompanied by the changes in the relative intensities of some meridional reflections while their axial positions remained unchanged. This may be explained as the result of the detachment of myosin subfragments-2 from the surfaces of thick filaments. The data obtained indicate that there is a correlation between the structure and localization of myosin subfragments-2 and the value of force generated by the muscle.
D000818:Animals; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D009994:Osmolar Concentration; D011817:Rabbits; D012996:Solutions; D014961:X-Ray Diffraction
D012996:Solutions
Rentgenograficheskoe izuchenie molekuliarnoĭ prirody zavisimosti rigornogo napriazheniia, razvivaemogo demembranizirovannymi puchkami volokon spinnoĭ myshtsy krolika, ot ionnoĭ sily rastvora.