Feb 20, 1976

Comparative studies on the structure and aggregative properties of the myosin molecule. III. The in vitro aggregative properties of the lobster myosin molecule

Biochimica Et Biophysica Acta
R F Siemankowski, C R Zobel


The solubility of rabbit skeletal and lobster abdominal muscle myosin has been studied in monovalent salt solutions as a function of pH (over the range 4.75 to 8.5) and ionic strength (50-500 mM). Rabbit skeletal muscle myosin was found to precipitate over a narrower pH range than the lobster abdominal muscle myosin but at equivalent pH values and ionic strengths the former exhibited greater solubility. Comparison of the solubility of rabbit myosin, per se with that of light meromyosin and lobster myosin with its equivalent proteolytically produced fragment (fraction B1) showed that both rod fragments were more soluble than their parent molecules. Under conditions of low solubility (low ionic strength and pH) the quantitiy of protein in solution remained essentially constant with increasing total protein, thus suggesting that the aggregation phenomenon is of a phase transition type. Examination of the aggregates by electron microscopy revealed that rabbit myosin formed classical, elongate, spindle-shaped filaments similar to those previously observed by others. In contrast lobster myosin only formed short, dumbbell-shaped filaments 0.2-0.3 mum long. Consideration of the pH ranges over which aggregation occurred suggests that pr...Continue Reading

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Mentioned in this Paper

Macromolecular Compounds
Skeletal System
Myosin Filament
Plasma Protein Binding Capacity
Electron Microscopy, Diagnostic
Chinchilla Rabbits

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