title: Effect of magnesium on the contractile behavior of actomyosin aggregates isolated from Physarum plasmodia.
abstract: The dependence on calcium concentration of the contractile behavior of actomyosin isolated from Physarum plasmodia according to Kohama & Kendrick-Jones (1986) was investigated under different magnesium conditions. The inhibitory calcium sensitivity is reduced at magnesium concentrations above or below 1 mM, i.e., contraction of actomyosin aggregates is most effectively inhibited in the presence of 1 mM calcium in combination with physiological magnesium concentrations. In the absence of calcium reactivation optimum is obtained at 8.5 mM Mg2+.
authors.affiliation: Institut für Cytologie, Universität Bonn, Federal Republic of Germany.
authors.forename: A
authors.initials: A
authors.lastname: Hartsiotis
authors.forename: S
authors.initials: S
authors.lastname: Gilges
authors.forename: B
authors.initials: B
authors.lastname: Hecks
authors.forename: F
authors.initials: F
authors.lastname: Achenbach
mesh_terms: D000205:Actomyosin / Q000502:physiology*; D002118:Calcium / Q000494:pharmacology*; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology*; D010804:Physarum / Q000187:drug effects / Q000502:physiology*
chemical_list: D000205:Actomyosin; D008274:Magnesium; D002118:Calcium