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- W2023129206 abstract "Tropomyosin (Tm) paracrystal formation induced by Mg2+ was studied by monitoring increases in light scattering. Paracrystals formed above a critical Tm concentration with lag phases in the time courses at pH 7.5 and 6.0, indicating that condensation polymerization processes are involved. The kinetic data at pH 7.5 reasonably fit a model in which nucleation and elongation are taken into account. The rate and extent of light scattering increased at low [Mg2+] and decreased at high [Mg2+] with a maximum at [Mg2+] = 15 mM, indicating different effects of Mg2+ in the two [Mg2+] ranges. The paracrystals were destabilized by increasing the salt concentration and decreasing the temperature. Mg2+ produces paracrystals at pH 6.0 and pH 7.5 by different kinetic mechanisms. Different Tm intermolecular interactions at the two pH values were indicated by studies of the excimer fluorescence of pyrene-labeled Tm and by effects of salt and temperature on the kinetics. At pH 6.0 Tm more readily formed paracrystals with decreased electrostatic effects. Effects of troponin on Mg2+-paracrystal formation of Tm at the two pH values correlated with the known differences in paracrystal structure when troponin is bound to Tm." @default.
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- W2023129206 date "1989-07-01" @default.
- W2023129206 modified "2023-09-27" @default.
- W2023129206 title "Mg2+-paracrystal formation of tropomyosin as a condensation phenomenon. Effects of pH, salt, temperature, and troponin binding" @default.
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- W2023129206 doi "https://doi.org/10.1016/s0006-3495(89)82655-4" @default.
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