title: [Changes in the mechano-chemical properties of actomyosin during desensitization].
abstract: The loss of Ca2+-sensitivity by natural actomyosin (desensitisation) after treatment with low ionic strength solutions results in marked deceleration of protein superprecipitation. This phenomenon is not due to the removal of minor proteins, since a similar effect was observed during "desensitisation" of synthetic actomyosin containing only myosin and actin. However, addition to desensitised actomyosin of tropomyosin, especially in combination with alpha-actinin markedly restores the initial parameters of superprecipitation and ATPase activity. It was assumed that desensitisation has a direct modifying influence on actomyosin, whose effect is weakened in the presence of tropomyosin and alpha-actinin.
mesh_terms: D000185:Actinin / Q000302:isolation & purification; D000199:Actins / Q000302:isolation & purification; D000205:Actomyosin / Q000302:isolation & purification*; D000818:Animals; D017301:Ca(2+) Mg(2+)-ATPase / Q000378:metabolism; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D066298:In Vitro Techniques; D007700:Kinetics; D008027:Light; D009132:Muscles / Q000032:analysis*; D009218:Myosins / Q000302:isolation & purification; D011817:Rabbits; D012542:Scattering, Radiation; D014335:Tropomyosin / Q000302:isolation & purification
chemical_list: D000199:Actins; D014335:Tropomyosin; D000185:Actinin; D000205:Actomyosin; D017301:Ca(2+) Mg(2+)-ATPase; D009218:Myosins
vernacular_title: Izmenenie mekhanokhimicheskikh svoĭstv aktomiozina pri desensibilizatsii.