Effect of magnesium on the contractile behavior of actomyosin aggregates isolated from Physarum plasmodia

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...

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Veröffentlicht in:	Cell biology international reports 1988-04, Vol.12 (4), p.245-251
Hauptverfasser:	HARTSIOTIS, A, GILGES, S, HECKS, B, ACHENBACH, F
Format:	Artikel
Sprache:	eng
Schlagworte:	Actomyosin - physiology Analytical, structural and metabolic biochemistry Biological and medical sciences Calcium - pharmacology Contractile proteins Fundamental and applied biological sciences. Psychology Holoproteins Kinetics Magnesium - pharmacology Physarum - drug effects Physarum - physiology Proteins
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Zusammenfassung:	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+.
ISSN:	0309-1651 1878-240X
DOI:	10.1016/0309-1651(88)90069-0