title: Myosin-like protein and actin-like protein from Escherichia coli K12 C600.
abstract: Myosin-like protein was obtained from E. coli by extraction with a sucrose solution and by precipitation with rabbit skeletal actin. The preparation of E. coli myosin-like protein looked very similar, in the sodium dodecyl sulfate-gel electrophoretic pattern, to that of rabbit skeletal myosin. The myosin-like protein was able to reversibly bind to rabbit actin. It had the activities of EDTA-, Ca-, and Mg-ATPases. The product in the EDTA-ATPase reaction catalyzed by the myosin-like protein was identified as ADP by ion exchange chromatography. The Mg-ATPase activity of E. coli myosin-like protein was activated by either rabbit actin or E. coli actin-like protein though the activation was much stronger by the latter. However, the myosin-like protein did not exhibit superprecipitation either with rabbit actin or with E. coli actin-like protein. Actin-like protein was also obtained from E. coli by essentially the same procedures as those described for preparation of rabbit skeletal actin. E. coli actin-like protein was capable of activating Mg-ATPase of rabbit myosin, and also of superprecipitation with rabbit myosin. Extraction from both the whole cells and the membrane fraction of E. coli strongly suggested that the myosin-like protein and the actin-like protein are both localized in the membrane fraction rather than in the cytoplasmic fraction.
mesh_terms: D000199:Actins / Q000302:isolation & purification* / Q000378:metabolism / Q000494:pharmacology; D000251:Adenosine Triphosphatases / Q000378:metabolism; D001426:Bacterial Proteins / Q000302:isolation & purification* / Q000378:metabolism / Q000494:pharmacology; D002458:Cell Fractionation; D004926:Escherichia coli / Q000032:analysis*; D009218:Myosins / Q000302:isolation & purification* / Q000378:metabolism; D013045:Species Specificity
chemical_list: D000199:Actins; D001426:Bacterial Proteins; D000251:Adenosine Triphosphatases; D009218:Myosins