Reactivation of cell-free models of endoplasmic drops from Physarum polycephalum after glycerol extraction at low ionic strength.
The effect of calcium ions on the reactivation of cytoplasmic actomyosin contraction in cell-free models of endoplasmic drops from Physarum polycephalum after glycerol extraction at low ionic strength depends on the duration of the extraction procedure: Ca++ prevents contraction in 20-h extracted specimens, whereas after several days of extraction this Ca++-sensitivity is lost. These results indicate an inhibitory effect of Ca++ on cytoplasmic actomyosin contraction.
Achenbach
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F
Wohlfarth-Bottermann
K E
KE
D000199:Actins / Q000502:physiology; D000205:Actomyosin / Q000502:physiology; D000255:Adenosine Triphosphate / Q000378:metabolism; D002118:Calcium / Q000502:physiology; D003593:Cytoplasm / Q000502:physiology*; D005990:Glycerol; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D008954:Models, Biological; D009119:Muscle Contraction / Q000187:drug effects; D009218:Myosins / Q000502:physiology; D009941:Organomercury Compounds / Q000494:pharmacology; D009994:Osmolar Concentration; D010804:Physarum
D000199:Actins; D009941:Organomercury Compounds; D000255:Adenosine Triphosphate; D000205:Actomyosin; D009218:Myosins; D005990:Glycerol; D002118:Calcium