Key result
Time-resolved changes in troponin conformation during skeletal muscle activation revealed a four-state structural kinetic model, with the fastest step matching calcium binding and a slower step tracking myosin head binding.
Population
Skeletal muscle thin filaments in situ
Design
Preclinical
Authors
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May inform thin-filament mechanistic studies; leaves open translation to human cardiac muscle.
The study provides a four-state structural kinetic model describing the molecular mechanism of skeletal muscle activation in the thin filament-myosin head complex.
Fusi et al. (2014) studied Skeletal muscle activation (n=27). Photolysis of caged calcium vs. Relaxing conditions was evaluated on Time-resolved changes in the conformation of troponin (order parameters <P2> and <P4>). Time-resolved changes in troponin conformation during skeletal muscle activation revealed a four-state structural kinetic model, with the fastest step matching calcium binding and a slower step tracking myosin head binding.
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