Key result
Both TnT and the TnT(1) tail fragment inhibit actin-tropomyosin-activated S1 ATPase, with TnT(1) producing a 10-fold reduction in the C- to M-state equilibrium, suggesting a modulatory role.
Population
Reconstituted actin-tropomyosin filaments
Design
Preclinical
Authors
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Supports dual structural-modulatory TnT roles in thin filament regulation; hypothesis-generating for human cardiac physiology, requiring further validation.
Troponin T has a modulatory as well as structural role in thin filament regulation, stabilizing the closed C-state.
Maytum et al. (2002) studied this question. TnT and TnT(1) tail fragment was evaluated on S1 ATPase activity and S1 kinetic/equilibrium binding. Both TnT and the TnT(1) tail fragment inhibit actin-tropomyosin-activated S1 ATPase, with TnT(1) producing a 10-fold reduction in the C- to M-state equilibrium, suggesting a modulatory role.
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