魚類ミオシンのフィラメント形成能と生化学的活性に及ぼすpHの影響

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Effect of pH (5.5-8.0) on filament-forming ability and biochemical activity of carp, tilapia, and rabbit myosins were studied. In the acidic pH range, both filament-forming ability and actin-activation of Mg-ATPase of the three myosins tended to increase. When the Mg-ATPase was strongly actin-activated and the activity was saturated by a small amount of actin, bipolar filaments whose thickness and length were more than 290Å and more than 0.7μm, respectively, were formed. Tilapia myosin unusually formed the bipolar filaments only in acidic condition. Changes in light scattering intensity of each myosin suspension suggested that the bipolar filaments might be in a rigid form, because they hardly dissociated into small myosin filaments by treatment with KCl or ATP.
日本水産學會の論文