Key result
Calcium produces a 4-fold change in the closed-open equilibrium for the skeletal troponin system but little change in the cardiac system, indicating significant differences in regulatory tuning.
Population
Thin filaments reconstituted with either skeletal or cardiac troponin
Comparison
Cardiac troponin isoform vs Skeletal troponin isoform
Design
Preclinical
Authors
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Indicates distinct cardiac-skeletal troponin tuning; leaves open translation to human muscle regulation and isoform-targeted therapies.
The regulatory tuning of the troponin complex produced by isoform variation is the net result of complex interactions among all troponin components, with significant differences in the -Ca(2+) state between cardiac and skeletal systems.
Maytum et al. (2003) studied this question. Skeletal troponin vs. Cardiac troponin was evaluated on Myosin subfragment 1 (S1) binding and kinetic measurements. Calcium produces a 4-fold change in the closed-open equilibrium for the skeletal troponin system but little change in the cardiac system, indicating significant differences in regulatory tuning.
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